def convert_file(self, file, title="MODIS SST Obs"):
"""
Load an MODIS file and convert into an obs structure
"""
# Load MODIS Data
import re
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(nc.variables["sst"][:],
self.temp_limits[0], self.temp_limits[1])
err = np.ones(dat.shape) * self.temp_error
time = seapy.date2day(datetime.datetime.strptime(
re.sub('\.[0-9]+Z$', '', nc.time_coverage_end),
"%Y-%m-%dT%H:%M:%S"), self.epoch)
# Check the data flags
flags = np.ma.masked_not_equal(nc.variables["qual_sst"][:], 0)
dat[flags.mask] = np.ma.masked
nc.close()
if self.grid.east():
lon[lon < 0] += 360
lon, lat = np.meshgrid(lon, lat)
good = dat.nonzero()
lat = lat[good]
lon = lon[good]
data = [seapy.roms.obs.raw_data("TEMP", self.provenance, dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, title)
def from_roms(roms_file, bry_file, grid=None, records=None):
"""
Given a ROMS history, average, or climatology file, generate
boundary conditions on the same grid.
Parameters
----------
roms_file : string or list,
ROMS source (history, average, climatology file)
bry_file : string,
output boundary file
grid : seapy.model.grid or string, optional,
ROMS grid for boundaries
records : array, optional
record indices to put into the boundary
Returns
-------
None
"""
if grid is None:
grid = seapy.model.asgrid(roms_file)
else:
grid = seapy.model.asgrid(grid)
ncroms = seapy.netcdf(roms_file)
src_ref, time = seapy.roms.get_reftime(ncroms)
records = np.arange(0, len(ncroms.variables[time][:])) \
if records is None else records
# Create the boundary file and fill up the descriptive data
ncbry = seapy.roms.ncgen.create_bry(bry_file,
eta_rho=grid.eta_rho,
xi_rho=grid.xi_rho,
s_rho=grid.n,
reftime=src_ref,
title="generated from " + roms_file)
brytime = seapy.roms.get_timevar(ncbry)
grid.to_netcdf(ncbry)
ncbry.variables["bry_time"][:] = netCDF4.date2num(
netCDF4.num2date(ncroms.variables[time][records],
ncroms.variables[time].units),
ncbry.variables[brytime].units)
for var in seapy.roms.fields:
if var in ncroms.variables:
for bry in sides:
ndim = seapy.roms.fields[var]["dims"]
if ndim == 3:
ncbry.variables["_".join((var, bry))][:] = \
ncroms.variables[var][records, :,
sides[bry].indices[0],
sides[bry].indices[1]]
elif ndim == 2:
ncbry.variables["_".join((var, bry))][:] = \
ncroms.variables[var][records,
sides[bry].indices[0],
sides[bry].indices[1]]
ncbry.close()
pass
def convert_file(self, file, title="MODIS SST Obs"):
"""
Load an MODIS file and convert into an obs structure
"""
# Load MODIS Data
import re
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(nc.variables["sst"][:],
self.temp_limits[0], self.temp_limits[1])
err = np.ones(dat.shape) * self.temp_error
time = seapy.date2day(datetime.datetime.strptime(
re.sub('\.[0-9]+Z$', '', nc.time_coverage_end),
"%Y-%m-%dT%H:%M:%S"), self.epoch)
# Check the data flags
flags = np.ma.masked_not_equal(nc.variables["qual_sst"][:], 0)
dat[flags.mask] = np.ma.masked
nc.close()
if self.grid.east():
lon[lon < 0] += 360
lon, lat = np.meshgrid(lon, lat)
good = dat.nonzero()
lat = lat[good]
lon = lon[good]
data = [seapy.roms.obs.raw_data("TEMP", self.provenance, dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, title)
def convert_file(self, file, title="AVISO Obs"):
"""
Load an AVISO file and convert into an obs structure
"""
# Load AVISO Data
nc = seapy.netcdf(file)
lonname = 'lon' if 'lon' in nc.variables.keys() else 'longitude'
lon = nc.variables[lonname][:]
latname = 'lat' if 'lat' in nc.variables.keys() else 'latitude'
lat = nc.variables[latname][:]
dat = np.squeeze(nc.variables["sla"][:])
err = np.squeeze(nc.variables["err"][:])
time = seapy.roms.get_time(
nc, "time", records=[0], epoch=self.epoch)[0]
nc.close()
lon, lat = np.meshgrid(lon, lat)
lat = lat.flatten()
lon = lon.flatten()
if not self.grid.east():
lon[lon > 180] -= 360
data = [seapy.roms.obs.raw_data("ZETA", "SSH_AVISO_MAP",
dat.flatten(), err.flatten(), self.ssh_error)]
# Grid it
obs = seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, title)
# Apply the model mean ssh to the sla data
if self.ssh_mean is not None:
m, p = seapy.oasurf(self.grid.I, self.grid.J, self.ssh_mean,
obs.x, obs.y, nx=1, ny=1, weight=7)
obs.value += m
return obs
def _initfile(self):
"""
Using an input file, try to load as much information
as can be found in the given file.
Parameters
----------
None
Returns
-------
None : sets attributes in grid
"""
# Define a dictionary to go through and convert netcdf variables
# to internal class attributes
gvars = {"lat_rho": ["lat_rho", "lat", "latitude", "y_rho"],
"lon_rho": ["lon_rho", "lon", "longitude", "x_rho"],
"lat_u": ["lat_u", "y_u"],
"lon_u": ["lon_u", "x_u"],
"lat_v": ["lat_v", "y_v"],
"lon_v": ["lon_v", "x_v"],
"mask_rho": ["mask_rho", "mask"],
"mask_u": ["mask_u"],
"mask_v": ["mask_v"],
"angle": ["angle"],
"h": ["h"],
"n": ["N"],
"theta_s": ["theta_s"],
"theta_b": ["theta_b"],
"tcline": ["Tcline"],
"hc": ["hc"],
"vtransform": ["Vtransform"],
"vstretching": ["Vstretching"],
"s_rho": ["s_rho"],
"cs_r": ["Cs_r"],
"f": ["f"],
"pm": ["pm"],
"pn": ["pn"],
"z": ["z", "depth", "lev"]
}
# Open the file
self._nc = seapy.netcdf(self.filename)
try:
self.name = re.search("[^\.]*",
os.path.basename(self.filename)).group()
except:
self.name = "untitled"
self.key = {}
for var in gvars:
for inp in gvars[var]:
if inp in self._nc.variables:
self.key[var] = inp
self.__dict__[var] = self._nc.variables[inp][:]
break
# Close the file
self._nc.close()
self._nc = None
def convert_file(self, file, title="OSTIA SST Obs"):
"""
Load an OSTIA file and convert into an obs structure
"""
# Load OSTIA Data
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(
nc.variables["analysed_sst"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(np.squeeze(
nc.variables["analysis_error"][:]), 0.01, 2.0)
dat[err.mask] = np.ma.masked
time = seapy.roms.num2date(
nc, "time", records=[0], epoch=self.epoch)[0]
nc.close()
if self.grid.east():
lon[lon < 0] += 360
lon, lat = np.meshgrid(lon, lat)
good = dat.nonzero()
lat = lat[good]
lon = lon[good]
data = [seapy.roms.obs.raw_data("TEMP", "SST_OSTIA", dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, title)
def convert_file(self, file, title="OSTIA SST Obs"):
"""
Load an OSTIA file and convert into an obs structure
"""
# Load OSTIA Data
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(
nc.variables["analysed_sst"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(np.squeeze(
nc.variables["analysis_error"][:]), 0.01, 2.0)
dat[err.mask] = np.ma.masked
time = netCDF4.num2date(nc.variables["time"][0],
nc.variables["time"].units) - self.epoch
time = time.total_seconds() * seapy.secs2day
nc.close()
if self.grid.east():
lon[lon < 0] += 360
lon, lat = np.meshgrid(lon, lat)
good = dat.nonzero()
lat = lat[good]
lon = lon[good]
data = [seapy.roms.obs.raw_data("TEMP", "SST_OSTIA", dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, title)
def convert_file(self, file, title="AVISO Obs"):
"""
Load an AVISO file and convert into an obs structure
"""
# Load AVISO Data
nc = seapy.netcdf(file)
lonname = 'lon' if 'lon' in nc.variables.keys() else 'longitude'
lon = nc.variables[lonname][:]
latname = 'lat' if 'lat' in nc.variables.keys() else 'latitude'
lat = nc.variables[latname][:]
dat = np.squeeze(nc.variables["sla"][:])
err = np.squeeze(nc.variables["err"][:])
time = netCDF4.num2date(nc.variables["time"][0],
nc.variables["time"].units) - self.epoch
time = time.total_seconds() * seapy.secs2day
nc.close()
lon, lat = np.meshgrid(lon, lat)
lat = lat.flatten()
lon = lon.flatten()
if not self.grid.east():
lon[lon > 180] -= 360
data = [seapy.roms.obs.raw_data("ZETA", "SSH_AVISO_MAP",
dat.flatten(), err.flatten(), self.ssh_error)]
# Grid it
obs = seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, title)
# Apply the model mean ssh to the sla data
if self.ssh_mean is not None:
m, p = seapy.oasurf(self.grid.I, self.grid.J, self.ssh_mean,
obs.x, obs.y, nx=1, ny=1, weight=7)
obs.value += m
return obs
def from_std(std_filename, bry_std_file, fields=None):
"""
Generate the boundary standard deviations file for 4DVAR from the
standard deviation of a boundary file. Best to use nco:
$ ncwa -a bry_time roms_bry_file tmp.nc
$ ncbo -O -y sub roms_bry_file tmp.nc tmp.nc
$ ncra -y rmssdn tmp.nc roms_bry_std.nc
to generate the standard deviations. This method simply takes the
standard deviations of the boundaries and puts them into the
proper format for ROMS 4DVAR.
Parameters
----------
std_filename : string or list,
Filename of the boundary standard deviation file
bry_std_file : string,
Filename of the boundary standard deviations file to create
fields : list, optional,
ROMS fields to generate boundaries for. The default are the
standard fields as defined in seapy.roms.fields
Returns
-------
None
"""
ncstd = seapy.netcdf(std_filename)
eta_rho = len(ncstd.dimensions["eta_rho"])
xi_rho = len(ncstd.dimensions["xi_rho"])
s_rho = len(ncstd.dimensions["s_rho"])
ncout = seapy.roms.ncgen.create_da_bry_std(bry_std_file,
eta_rho=eta_rho, xi_rho=xi_rho,
s_rho=s_rho,
title='STD from ' + std_filename)
ncout.variables["ocean_time"][:] = ncstd.variables["bry_time"][0]
if fields is None:
fields = seapy.roms.fields
# Go over every side for every field and put it together
for var in fields:
vname = var + "_obc"
if vname not in ncout.variables:
ncout.createVariable(vname, np.float32,
('ocean_time', "boundary", "s_rho", "IorJ"))
ndat = np.zeros(ncout.variables[vname].shape)
for bry in sides:
order = sides[bry].order - 1
dat = ncstd.variables[var + "_" + bry][0, :]
if dat.ndim == 1:
ndat[0, order, :len(dat)] = dat
else:
ndat[0, order, :, :dat.shape[1]] = dat
ncout.variables[vname][:] = ndat
ncout.sync()
pass
def convert_file(self, file, title="TAO Obs"):
"""
Load a TAO netcdf file and convert into an obs structure
"""
vals = {"temp": ["T_20", "QT_5020"],
"salt": ["S_41", "QS_5041"],
"u": ["U_320", "QS_5300"],
"v": ["V_321", "QS_5300"]}
nc = seapy.netcdf(file)
lat = nc.variables["lat"][:]
lon = nc.variables["lon"][:]
if not self.grid.east():
lon[lon > 180] -= 360
lat, lon = np.meshgrid(lat, lon)
time = netCDF4.num2date(nc.variables["time"][:],
nc.variables["time"].units) - self.epoch
time = list(map(lambda x: x.total_seconds() * seapy.secs2day, time))
depth = -nc.variables["depth"][:]
profile_list = np.where(np.logical_and.reduce((
lon >= np.min(self.grid.lon_rho),
lon <= np.max(self.grid.lon_rho),
lat >= np.min(self.grid.lat_rho),
lat <= np.max(self.grid.lat_rho))))
# If nothing is in the area, return nothing
if not profile_list[0].size:
return None
# Process each of the variables that are present
obsdata = []
for field in vals:
limit = getattr(self, field + '_limits')
if vals[field][0] in nc.variables:
data = nc.variables[vals[field][0]][:]
data = np.ma.masked_outside(
data[profile_list[0], profile_list[1], :, :],
limit[0], limit[1], copy=False)
qc = nc.variables[vals[field][1]][:]
qc = qc[profile_list[0], profile_list[1], :, :]
bad = np.where(np.logical_and(qc != 1, qc != 2))
data[bad] = np.ma.masked
obsdata.append(seapy.roms.obs.raw_data(field, "TAO_ARRAY",
data.compressed(), None,
getattr(self, field + '_error')))
nc.close()
# Build the time, lon, lat, and depth arrays of appropriate size
npts = profile_list[0].size
ndep = depth.size
nt = len(time)
lat = np.resize(lat[profile_list], (nt, ndep, npts))
lat = np.squeeze(np.transpose(lat, (2, 1, 0)))[~data.mask]
lon = np.resize(lon[profile_list], (nt, ndep, npts))
lon = np.squeeze(np.transpose(lon, (2, 1, 0)))[~data.mask]
depth = np.resize(depth, (npts, nt, ndep))
depth = np.squeeze(np.transpose(depth, (0, 2, 1)))[~data.mask]
time = np.squeeze(np.resize(time, (npts, ndep, nt)))[~data.mask]
return seapy.roms.obs.gridder(self.grid, time, lon, lat, depth,
obsdata, self.dt, title)
def from_roms(roms_file, ini_file, record=0, time=None, grid=None,
clobber=False, cdl=None):
"""
Given a ROMS history, average, or climatology file, generate
initial conditions on the same grid.
Parameters
----------
roms_file: string or list
Input ROMS source (history, average, climatology file)
ini_file: string
Input name for output initial condition file
record: int
Input index to use as initial condition
time: datetime optional
Input datetime to use for the initial condition (default to record time)
grid: seapy.model.grid or string, optional
Input ROMS grid: specify the grid if loaded or filename to load
clobber: bool, optional
If True, clobber any existing files and recreate. If False, use
the existing file definition
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
Returns
-------
None
"""
# Load the grid
if grid is None:
grid = seapy.model.asgrid(roms_file)
else:
grid = seapy.model.asgrid(grid)
ncroms = seapy.netcdf(roms_file)
src_ref, romstime = seapy.roms.get_reftime(ncroms)
# Create the initial file and fill up the descriptive data
ncini = seapy.roms.ncgen.create_ini(ini_file,
eta_rho=grid.eta_rho, xi_rho=grid.xi_rho, s_rho=grid.n,
reftime=src_ref, clobber=clobber, cdl=cdl,
title="generated from " + roms_file)
grid.to_netcdf(ncini)
if time is None:
time = seapy.roms.num2date(ncroms, romstime, record)
ncini.variables["ocean_time"][:] = seapy.roms.date2num(
time, ncini, "ocean_time")
# Fill up the initial state with the roms file data
for var in seapy.roms.fields:
if var in ncini.variables and var in ncroms.variables:
ncini.variables[var][0, :] = ncroms.variables[var][record, :]
# Close up
ncini.close()
ncroms.close()
pass
def from_roms(roms_file, ini_file, record=0, time=None, grid=None,
clobber=False, cdl=None):
"""
Given a ROMS history, average, or climatology file, generate
initial conditions on the same grid.
Parameters
----------
roms_file: string or list
Input ROMS source (history, average, climatology file)
ini_file: string
Input name for output initial condition file
record: int
Input index to use as initial condition
time: datetime optional
Input datetime to use for the initial condition (default to record time)
grid: seapy.model.grid or string, optional
Input ROMS grid: specify the grid if loaded or filename to load
clobber: bool, optional
If True, clobber any existing files and recreate. If False, use
the existing file definition
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
Returns
-------
None
"""
# Load the grid
if grid is None:
grid = seapy.model.asgrid(roms_file)
else:
grid = seapy.model.asgrid(grid)
ncroms = seapy.netcdf(roms_file)
src_ref, romstime = seapy.roms.get_reftime(ncroms)
# Create the initial file and fill up the descriptive data
ncini = seapy.roms.ncgen.create_ini(ini_file,
eta_rho=grid.eta_rho, xi_rho=grid.xi_rho, s_rho=grid.n,
reftime=src_ref, clobber=clobber, cdl=cdl,
title="generated from " + roms_file)
grid.to_netcdf(ncini)
if time is None:
time = seapy.roms.num2date(ncroms, romstime, record)
ncini.variables["ocean_time"][:] = seapy.roms.date2num(
time, ncini, "ocean_time")
# Fill up the initial state with the roms file data
for var in seapy.roms.fields:
if var in ncini.variables and var in ncroms.variables:
ncini.variables[var][0, :] = ncroms.variables[var][record, :]
# Close up
ncini.close()
ncroms.close()
pass
def from_roms(roms_file, bry_file, grid=None, records=None):
"""
Given a ROMS history, average, or climatology file, generate
boundary conditions on the same grid.
Parameters
----------
roms_file : string or list,
ROMS source (history, average, climatology file)
bry_file : string,
output boundary file
grid : seapy.model.grid or string, optional,
ROMS grid for boundaries
records : array, optional
record indices to put into the boundary
Returns
-------
None
"""
if grid is None:
grid = seapy.model.asgrid(roms_file)
else:
grid = seapy.model.asgrid(grid)
ncroms = seapy.netcdf(roms_file)
src_ref, time = seapy.roms.get_reftime(ncroms)
records = np.arange(0, len(ncroms.variables[time][:])) \
if records is None else records
# Create the boundary file and fill up the descriptive data
ncbry = seapy.roms.ncgen.create_bry(bry_file,
eta_rho=grid.eta_rho, xi_rho=grid.xi_rho,
s_rho=grid.n, reftime=src_ref,
title="generated from " + roms_file)
brytime = seapy.roms.get_timevar(ncbry)
grid.to_netcdf(ncbry)
ncbry.variables["bry_time"][:] = netCDF4.date2num(
netCDF4.num2date(ncroms.variables[time][records],
ncroms.variables[time].units),
ncbry.variables[brytime].units)
for var in seapy.roms.fields:
if var in ncroms.variables:
for bry in sides:
ndim = seapy.roms.fields[var]["dims"]
if ndim == 3:
ncbry.variables["_".join((var, bry))][:] = \
ncroms.variables[var][records, :,
sides[bry].indices[0],
sides[bry].indices[1]]
elif ndim == 2:
ncbry.variables["_".join((var, bry))][:] = \
ncroms.variables[var][records,
sides[bry].indices[0],
sides[bry].indices[1]]
ncbry.close()
pass
def convert_file(self, file, title="TAO Obs"):
"""
Load a TAO netcdf file and convert into an obs structure
"""
vals = {"temp": ["T_20", "QT_5020"],
"salt": ["S_41", "QS_5041"],
"u": ["U_320", "QS_5300"],
"v": ["V_321", "QS_5300"]}
nc = seapy.netcdf(file)
lat = nc.variables["lat"][:]
lon = nc.variables["lon"][:]
if not self.grid.east():
lon[lon > 180] -= 360
lat, lon = np.meshgrid(lat, lon)
time = seapy.roms.num2date(nc, "time", epoch=self.epoch)
depth = -nc.variables["depth"][:]
profile_list = np.where(np.logical_and.reduce((
lon >= np.min(self.grid.lon_rho),
lon <= np.max(self.grid.lon_rho),
lat >= np.min(self.grid.lat_rho),
lat <= np.max(self.grid.lat_rho))))
# If nothing is in the area, return nothing
if not profile_list[0].size:
return None
# Process each of the variables that are present
obsdata = []
for field in vals:
limit = getattr(self, field + '_limits')
if vals[field][0] in nc.variables:
data = nc.variables[vals[field][0]][:]
data = np.ma.masked_outside(
data[profile_list[0], profile_list[1], :, :],
limit[0], limit[1], copy=False)
qc = nc.variables[vals[field][1]][:]
qc = qc[profile_list[0], profile_list[1], :, :]
bad = np.where(np.logical_and(qc != 1, qc != 2))
data[bad] = np.ma.masked
obsdata.append(seapy.roms.obs.raw_data(field, "TAO_ARRAY",
data.compressed(), None,
getattr(self, field + '_error')))
nc.close()
# Build the time, lon, lat, and depth arrays of appropriate size
npts = profile_list[0].size
ndep = depth.size
nt = len(time)
lat = np.resize(lat[profile_list], (nt, ndep, npts))
lat = np.squeeze(np.transpose(lat, (2, 1, 0)))[~data.mask]
lon = np.resize(lon[profile_list], (nt, ndep, npts))
lon = np.squeeze(np.transpose(lon, (2, 1, 0)))[~data.mask]
depth = np.resize(depth, (npts, nt, ndep))
depth = np.squeeze(np.transpose(depth, (0, 2, 1)))[~data.mask]
time = np.squeeze(np.resize(time, (npts, ndep, nt)))[~data.mask]
return seapy.roms.obs.gridder(self.grid, time, lon, lat, depth,
obsdata, self.dt, title)
def gen_direct_forcing(his_file, frc_file):
"""
Generate a direct forcing file from a history (or other ROMS output) file. It requires
that sustr, svstr, shflux, and ssflux (or swflux) with salt be available. This will
generate a forcing file that contains: sustr, svstr, swflux, and ssflux.
Parameters
----------
his_file: string,
The ROMS history (or other) file(s) (can use wildcards) that contains the fields to
make forcing from
frc_file: string,
The output forcing file
Returns
-------
None: Generates an output file of bulk forcings
"""
import os
infile = seapy.netcdf(his_file)
ref, _ = seapy.roms.get_reftime(infile)
# Create the output file
nc = seapy.roms.ncgen.create_frc_direct(frc_file,
eta_rho=infile.dimensions[
'eta_rho'].size,
xi_rho=infile.dimensions[
'xi_rho'].size,
reftime=ref,
clobber=True,
title="Forcing from " +
os.path.basename(his_file))
# Copy the data over
nc.variables['SSS'][:] = infile.variables['salt'][:, -1, :, :]
if 'EminusP' in infile.variables:
nc.variables['swflux'][:] = infile.variables['EminusP'][:]
elif 'swflux' in infile.variables:
nc.variables['swflux'][:] = infile.variables['swflux'][:]
else:
nc.variables['swflux'][:] = infile.variables['ssflux'][:] \
/ nc.variables['SSS'][:]
nc.variables['frc_time'][:] = netCDF4.date2num(netCDF4.num2date(
infile.variables['ocean_time'][:],
infile.variables['ocean_time'].units), nc.variables['frc_time'].units)
for f in seapy.progressbar.progress(("sustr", "svstr", "shflux", "swrad",
"lat_rho", "lat_u", "lat_v",
"lon_rho", "lon_u", "lon_v")):
if f in infile.variables:
nc.variables[f][:] = seapy.convolve_mask(
infile.variables[f][:], copy=False)
nc.close()
def tide_error(his_file, tide_file, grid=None):
"""
Calculates the tidal error for each point given a model history and the
tidal file used
Parameters
----------
his_file : string,
String of history file location. Can be multiple files using wildcard
tide_file: string,
String of tidal file location
grid : string or grid, optional,
If specified, use this grid. Default is to build a grid from the history
file.
Returns
-------
tide_error : masked_array,
Array containing the tidal error at each point, with land points masked
"""
if grid:
grid = seapy.model.asgrid(grid)
else:
grid = seapy.model.asgrid(his_file)
# Load tidal file data
frc = load_forcing(tide_file)
# Calculate tidal error for each point
nc = seapy.netcdf(his_file)
times = seapy.roms.num2date(nc)
tide_error = np.ma.masked_where(grid.mask_rho == 0,
np.zeros((grid.mask_rho.shape)))
zeta = nc.variables['zeta'][:]
nc.close()
for i in track(range(grid.ln)):
for j in range(grid.lm):
if not tide_error.mask[i, j]:
z = zeta[:, i, j]
t_ap = seapy.tide.pack_amp_phase(frc['tides'],
frc['Eamp'][:, i, j],
frc['Ephase'][:, i, j])
mout = seapy.tide.fit(times,
z,
tides=frc['tides'],
lat=grid.lat_rho[i, j],
tide_start=frc['tide_start'])
for c in t_ap:
m = mout['major'][c]
t = t_ap[c]
tide_error[i, j] += 0.5 * (m.amp**2 + t.amp**2) - \
m.amp * t.amp * np.cos(m.phase - t.phase)
tide_error[i, j] = np.sqrt(tide_error[i, j])
return tide_error
def datespan_file(self, file):
nc = seapy.netcdf(file)
try:
st = datetime.datetime.strptime(nc.getncattr("time_coverage_start"),
"%Y-%m-%dT%H:%M:%SZ")
en = datetime.datetime.strptime(nc.getncattr("time_coverage_end"),
"%Y-%m-%dT%H:%M:%SZ")
except:
st = en = None
pass
finally:
nc.close()
return st, en
def datespan_file(self, file):
nc = seapy.netcdf(file)
try:
st = datetime.datetime.strptime(nc.getncattr("time_coverage_start"),
"%Y-%m-%dT%H:%M:%SZ")
en = datetime.datetime.strptime(nc.getncattr("time_coverage_end"),
"%Y-%m-%dT%H:%M:%SZ")
except:
st = en = None
pass
finally:
nc.close()
return st, en
def datespan_file(self, file):
nc = seapy.netcdf(file)
try:
st = datetime.datetime.strptime(nc.getncattr("start_date"),
"%Y-%m-%d UTC")
en = datetime.datetime.strptime(nc.getncattr("stop_date"),
"%Y-%m-%d UTC")
except:
st = en = None
pass
finally:
nc.close()
return st, en
def datespan_file(self, file):
nc = seapy.netcdf(file)
try:
st = datetime.datetime.strptime(nc.getncattr("start_date"),
"%Y-%m-%d UTC")
en = datetime.datetime.strptime(nc.getncattr("stop_date"),
"%Y-%m-%d UTC")
except:
st = en = None
pass
finally:
nc.close()
return st, en
def tide_error(his_file, tide_file, grid=None):
"""
Calculates the tidal error for each point given a model history and the
tidal file used
Parameters
----------
his_file : string,
String of history file location. Can be multiple files using wildcard
tide_file: string,
String of tidal file location
grid : string or grid, optional,
If specified, use this grid. Default is to build a grid from the history
file.
Returns
-------
tide_error : masked_array,
Array containing the tidal error at each point, with land points masked
"""
if grid:
grid = seapy.model.asgrid(grid)
else:
grid = seapy.model.asgrid(his_file)
# Load tidal file data
frc = load_forcing(tide_file)
# Calculate tidal error for each point
nc = seapy.netcdf(his_file)
times = seapy.roms.num2date(nc)
tide_error = np.ma.masked_where(
grid.mask_rho == 0, np.zeros((grid.mask_rho.shape)))
zeta = nc.variables['zeta'][:]
nc.close()
for i in seapy.progressbar.progress(range(grid.ln)):
for j in range(grid.lm):
if not tide_error.mask[i, j]:
z = zeta[:, i, j]
t_ap = seapy.tide.pack_amp_phase(frc['tides'],
frc['Eamp'][:, i, j], frc['Ephase'][:, i, j])
mout = seapy.tide.fit(times, z, tides=frc['tides'],
lat=grid.lat_rho[i, j], tide_start=frc['tide_start'])
for c in t_ap:
m = mout['major'][c]
t = t_ap[c]
tide_error[i, j] += 0.5 * (m.amp**2 + t.amp**2) - \
m.amp * t.amp * np.cos(m.phase - t.phase)
tide_error[i, j] = np.sqrt(tide_error[i, j])
return tide_error
def load_forcing(filename):
"""
Load a tidal forcing file into a dictionary
Parameters
----------
filename: string
File name of the tidal forcing file to load
Returns
-------
dict:
Dictionary of the tidal forcing information with keys:
Eamp : SSH amplitdue
Ephase : SSH phase (radians)
Cmajor : velocity major ellipse
Cminor : velocity minor ellipse
Cphase : velocity ellipse phase (radians)
Cangle : velocity ellipse angle (radians)
tide_start : datetime of the tide reference
tides : list of the tides
"""
import re
nc = seapy.netcdf(filename)
frc = {}
frc['Eamp'] = nc.variables['tide_Eamp'][:]
frc['Ephase'] = np.radians(nc.variables['tide_Ephase'][:])
frc['Cmajor'] = nc.variables['tide_Cmax'][:]
frc['Cminor'] = nc.variables['tide_Cmin'][:]
frc['Cphase'] = np.radians(nc.variables['tide_Cphase'][:])
frc['Cangle'] = np.radians(nc.variables['tide_Cangle'][:])
start_str = getattr(nc, 'tide_start', None) or \
getattr(nc, 'base_date', None)
tides = getattr(nc, 'tidal_constituents', None) or \
getattr(nc, 'tides', None)
frc['tides'] = tides.upper().split(", ")
frc['tide_start'] = None
nc.close()
if start_str:
try:
frc['tide_start'] = datetime.datetime.strptime(
re.sub('^.*since\s*', '', start_str),
"%Y-%m-%d %H:%M:%S")
except ValueError:
pass
return frc
def load_forcing(filename):
"""
Load a tidal forcing file into a dictionary
Parameters
----------
filename: string
File name of the tidal forcing file to load
Returns
-------
dict:
Dictionary of the tidal forcing information with keys:
Eamp : SSH amplitdue
Ephase : SSH phase (radians)
Cmajor : velocity major ellipse
Cminor : velocity minor ellipse
Cphase : velocity ellipse phase (radians)
Cangle : velocity ellipse angle (radians)
tide_start : datetime of the tide reference
tides : list of the tides
"""
import re
nc = seapy.netcdf(filename)
frc = {}
frc['Eamp'] = nc.variables['tide_Eamp'][:]
frc['Ephase'] = np.radians(nc.variables['tide_Ephase'][:])
frc['Cmajor'] = nc.variables['tide_Cmax'][:]
frc['Cminor'] = nc.variables['tide_Cmin'][:]
frc['Cphase'] = np.radians(nc.variables['tide_Cphase'][:])
frc['Cangle'] = np.radians(nc.variables['tide_Cangle'][:])
start_str = getattr(nc, 'tide_start', None) or \
getattr(nc, 'base_date', None)
tides = getattr(nc, 'tidal_constituents', None) or \
getattr(nc, 'tides', None)
frc['tides'] = tides.upper().split(", ")
frc['tide_start'] = None
nc.close()
if start_str:
try:
frc['tide_start'] = datetime.datetime.strptime(
re.sub('^.*since\s*', '', start_str),
"%Y-%m-%d %H:%M:%S")
except ValueError:
pass
return frc
def datespan_file(self, file):
"""
return the just the day that this argo file covers
"""
nc = seapy.netcdf(file)
try:
d = netCDF4.num2date(nc.variables['JULD'][0],
nc.variables['JULD'].units)
st = datetime.datetime(*d.timetuple()[:3])
en = datetime.datetime(*d.timetuple()[:3] + (23, 59, 59))
except:
st = en = None
pass
finally:
nc.close()
return st, en
def datespan_file(self, file):
"""
return the just the day that this argo file covers
"""
nc = seapy.netcdf(file)
try:
d = netCDF4.num2date(nc.variables['JULD'][0],
nc.variables['JULD'].units)
st = datetime.datetime(*d.timetuple()[:3])
en = datetime.datetime(*d.timetuple()[:3] + (23, 59, 59))
except:
st = en = None
pass
finally:
nc.close()
return st, en
def convert_file(self, file, title="REMSS SST Obs"):
"""
Load an REMSS file and convert into an obs structure
"""
# Load REMSS Data
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(
nc.variables["sea_surface_temperature"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(np.squeeze(
nc.variables["SSES_standard_deviation_error"][:]), 0.01, 2.0)
dat[err.mask] = np.ma.masked
# Check the data flags
flags = np.ma.masked_not_equal(
np.squeeze(nc.variables["rejection_flag"][:]), 0)
dat[flags.mask] = np.ma.masked
err[flags.mask] = np.ma.masked
# Grab the observation time
time = netCDF4.num2date(nc.variables["time"][:],
nc.variables["time"].units)
time = np.array([(t - self.epoch).total_seconds() * seapy.secs2day
for t in time])
sst_time = nc.variables["sst_dtime"][:] * seapy.secs2day
for n, i in enumerate(time):
sst_time[n, :, :] += i
sst_time[dat.mask] = np.ma.masked
# Set up the coordinate
lon, lat = np.meshgrid(lon, lat)
lon = np.ma.masked_where(dat.mask, seapy.adddim(lon, len(time)))
lat = np.ma.masked_where(dat.mask, seapy.adddim(lat, len(time)))
nc.close()
if self.grid.east():
lon[lon < 0] += 360
data = [seapy.roms.obs.raw_data("TEMP", self.provenance,
dat.compressed(),
err.compressed(), self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, sst_time.compressed(),
lon.compressed(), lat.compressed, None,
data, self.dt, title)
def convert_file(self, file, title="AVISO SLA Track Obs"):
"""
Load an AVISO file and convert into an obs structure
"""
# Load AVISO Data
nc = seapy.netcdf(file)
lon = nc.variables["longitude"][:]
lat = nc.variables["latitude"][:]
slaname = 'SLA' if 'SLA' in nc.variables.keys() else 'sla_filtered'
dat = nc.variables[slaname][:]
time = seapy.roms.num2date(nc, "time", epoch=self.epoch)
nc.close()
# make them into vectors
lat = lat.ravel()
lon = lon.ravel()
dat = dat.ravel()
err = np.ones(dat.shape) * _aviso_sla_errors.get(self.provenance, 0.1)
if not self.grid.east():
lon[lon > 180] -= 360
good = dat.nonzero()
data = [seapy.roms.obs.raw_data("ZETA", self.provenance,
dat[good], err[good], err[0])]
# Grid it
obs = seapy.roms.obs.gridder(self.grid, time, lon[good], lat[good], None,
data, self.dt, title)
# Apply the model mean ssh to the sla data
if self.ssh_mean is not None and obs is not None:
m, p = seapy.oasurf(self.grid.I, self.grid.J, self.ssh_mean,
obs.x, obs.y, nx=1, ny=1, weight=7)
obs.value += m
# Duplicate the observations before and after as per the repeat
# time unless it is zero
if self.repeat and obs:
prior = obs.copy()
after = obs.copy()
prior.time -= self.repeat / 24
after.time += self.repeat / 24
obs.add(prior)
obs.add(after)
return obs
def convert_file(self, file, title="AVISO SLA Track Obs"):
"""
Load an AVISO file and convert into an obs structure
"""
# Load AVISO Data
nc = seapy.netcdf(file)
lon = nc.variables["longitude"][:]
lat = nc.variables["latitude"][:]
slaname = 'SLA' if 'SLA' in nc.variables.keys() else 'sla_filtered'
dat = nc.variables[slaname][:]
time = seapy.roms.get_time(nc, "time", epoch=self.epoch)
nc.close()
# make them into vectors
lat = lat.ravel()
lon = lon.ravel()
dat = dat.ravel()
err = np.ones(dat.shape) * _aviso_sla_errors.get(self.provenance, 0.1)
if not self.grid.east():
lon[lon > 180] -= 360
good = dat.nonzero()
data = [seapy.roms.obs.raw_data("ZETA", self.provenance,
dat[good], err[good], err[0])]
# Grid it
obs = seapy.roms.obs.gridder(self.grid, time, lon[good], lat[good], None,
data, self.dt, title)
# Apply the model mean ssh to the sla data
if self.ssh_mean is not None and obs is not None:
m, p = seapy.oasurf(self.grid.I, self.grid.J, self.ssh_mean,
obs.x, obs.y, nx=1, ny=1, weight=7)
obs.value += m
# Duplicate the observations before and after as per the repeat
# time unless it is zero
if self.repeat and obs:
prior = obs.copy()
after = obs.copy()
prior.time -= self.repeat / 24
after.time += self.repeat / 24
obs.add(prior)
obs.add(after)
return obs
def set_mask_h(self, fld=None):
"""
Compute the mask and h array from a z-level model
Parameters
----------
fld : np.array
3D array of values (such as temperature) to analyze to determine
where the bottom and land lie
Returns
-------
None : sets mask and h attributes in grid
"""
if hasattr(self, "mask_rho") or self.cgrid:
return
if fld is None and self.filename is not None:
if self._nc is None:
self._nc = seapy.netcdf(self.filename)
# Try to load a field from the file
for f in ["temp", "temperature", "water_temp"]:
if f in self._nc.variables:
fld = self._nc.variables[f][0, :, :, :]
fld = np.ma.array(fld, mask=np.isnan(fld))
break
# Close the file
self._nc.close()
# If we don't have a field to examine, then we cannot compute the
# mask and bathymetry
if fld is None:
warn("Missing 3D field to evaluate.")
return
# Next, we go over the field to examine the depths and mask
self.h = np.zeros(self.lat_rho.shape)
self.mask_rho = np.zeros(self.lat_rho.shape)
for k in range(self.z.size):
water = np.nonzero(np.logical_not(fld.mask[k, :, :]))
self.h[water] = self.z[k]
if k == 0:
self.mask_rho[water] = 1.0
self.mask_u = self.mask_v = self.mask_rho
def set_mask_h(self, fld=None):
"""
Compute the mask and h array from a z-level model
Parameters
----------
fld : np.array
3D array of values (such as temperature) to analyze to determine
where the bottom and land lie
Returns
-------
None : sets mask and h attributes in grid
"""
if hasattr(self, "mask_rho") or self.cgrid:
return
if fld is None and self.filename is not None:
if self._nc is None:
self._nc = seapy.netcdf(self.filename)
# Try to load a field from the file
for f in ["temp", "temperature", "water_temp", "fed"]:
if f in self._nc.variables:
fld = self._nc.variables[f][0, :, :, :]
fld = np.ma.array(fld, mask=np.isnan(fld))
break
# Close the file
self._nc.close()
# If we don't have a field to examine, then we cannot compute the
# mask and bathymetry
if fld is None:
warn("Missing 3D field to evaluate.")
return
# Next, we go over the field to examine the depths and mask
self.h = np.zeros(self.lat_rho.shape)
self.mask_rho = np.zeros(self.lat_rho.shape)
for k in range(self.z.size):
water = np.nonzero(np.logical_not(fld.mask[k, :, :]))
self.h[water] = self.z[k]
if k == 0:
self.mask_rho[water] = 1.0
self.mask_u = self.mask_v = self.mask_rho
def convert_file(self, file, title="VIIRS SST Obs"):
"""
Load a VIIRS file and convert into an obs structure
"""
# Load VIIRS Data
nc = seapy.netcdf(file, aggdim="time")
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(
nc.variables["sea_surface_temperature"][:] - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(
nc.variables["sses_standard_deviation"][:], 0.01, 2.0)
dat[err.mask] = np.ma.masked
# Check the data flags
if self.check_qc_flags:
flags = np.ma.masked_not_equal(
nc.variables["quality_level"][:], 5)
dat[flags.mask] = np.ma.masked
else:
dat = np.ma.masked_where(
nc.variables["quality_level"][:].data == 1, dat)
# Grab the observation time
time = netCDF4.num2date(nc.variables["time"][:],
nc.variables["time"].units) - self.epoch
time = np.asarray([x.total_seconds() for x in time])[
:, np.newaxis, np.newaxis]
dtime = nc.variables["sst_dtime"][:]
time = (time + dtime) * seapy.secs2day
nc.close()
# Set up the coordinate
lon = np.ma.masked_where(dat.mask, seapy.adddim(lon, len(time)))
lat = np.ma.masked_where(dat.mask, seapy.adddim(lat, len(time)))
if self.grid.east():
lon[lon < 0] += 360
good = dat.nonzero()
data = [seapy.roms.obs.raw_data("TEMP", self.provenance,
dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time[good], lon[good], lat[good],
None, data, self.dt, title)
def convert_file(self, file, title="VIIRS SST Obs"):
"""
Load a VIIRS file and convert into an obs structure
"""
# Load VIIRS Data
nc = seapy.netcdf(file, aggdim="time")
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(
nc.variables["sea_surface_temperature"][:] - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(
nc.variables["sses_standard_deviation"][:], 0.01, 2.0)
dat[err.mask] = np.ma.masked
# Check the data flags
if self.check_qc_flags:
flags = np.ma.masked_not_equal(
nc.variables["quality_level"][:], 5)
dat[flags.mask] = np.ma.masked
else:
dat = np.ma.masked_where(
nc.variables["quality_level"][:].data == 1, dat)
# Grab the observation time
time = netCDF4.num2date(nc.variables["time"][:],
nc.variables["time"].units) - self.epoch
time = np.asarray([x.total_seconds() for x in time])[
:, np.newaxis, np.newaxis]
dtime = nc.variables["sst_dtime"][:]
time = (time + dtime) * seapy.secs2day
nc.close()
# Set up the coordinate
lon = np.ma.masked_where(dat.mask, seapy.adddim(lon, len(time)))
lat = np.ma.masked_where(dat.mask, seapy.adddim(lat, len(time)))
if self.grid.east():
lon[lon < 0] += 360
good = dat.nonzero()
data = [seapy.roms.obs.raw_data("TEMP", self.provenance,
dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time[good], lon[good], lat[good],
None, data, self.dt, title)
def convert_file(self, file, title="REMSS SST Obs"):
"""
Load an REMSS file and convert into an obs structure
"""
# Load REMSS Data
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(
nc.variables["sea_surface_temperature"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(np.squeeze(
nc.variables["SSES_standard_deviation_error"][:]), 0.01, 2.0)
dat[err.mask] = np.ma.masked
# Check the data flags
flags = np.ma.masked_not_equal(
np.squeeze(nc.variables["rejection_flag"][:]), 0)
dat[flags.mask] = np.ma.masked
err[flags.mask] = np.ma.masked
# Grab the observation time
time = seapy.roms.num2date(nc, "time", epoch=self.epoch)
sst_time = nc.variables["sst_dtime"][:] * seapy.secs2day
for n, i in enumerate(time):
sst_time[n, :, :] += i
sst_time[dat.mask] = np.ma.masked
# Set up the coordinate
lon, lat = np.meshgrid(lon, lat)
lon = np.ma.masked_where(dat.mask, seapy.adddim(lon, len(time)))
lat = np.ma.masked_where(dat.mask, seapy.adddim(lat, len(time)))
nc.close()
if self.grid.east():
lon[lon < 0] += 360
data = [seapy.roms.obs.raw_data("TEMP", self.provenance,
dat.compressed(),
err.compressed(), self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, sst_time.compressed(),
lon.compressed(), lat.compressed, None,
data, self.dt, title)
def convert_file(self, file, title="NAVO SST Obs"):
"""
Load a NAVO map file and convert into an obs structure
"""
import re
import sys
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(nc.variables["analysed_sst"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.array(np.squeeze(
nc.variables["analysis_error"][:]), mask=dat.mask)
# this is an analyzed product and provides errors as a function
# of space and time directly the temperature is the bulk
# temperature (ie at around 4m depth, below the e-folding depths of
# sunlight in the ocean so the product does not have a diuranl cycle
# (ie you don;t have to worry about hourly variations)
time = netCDF4.num2date(nc.variables["time"][0],
nc.variables["time"].units) - self.epoch
time = time.total_seconds() * seapy.secs2day
nc.close()
# here we set the depth to be 4 m below the surface
if self.grid.east():
lon[lon < 0] += 360
lon, lat = np.meshgrid(lon, lat)
good = dat.nonzero()
lat = lat[good]
lon = lon[good]
data = [seapy.roms.obs.raw_data("TEMP", self.provenance, dat.compressed(),
err[good], self.temp_error)]
# Grid it
obs = seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, depth_adjust=True, title=title)
obs.z *= 0
obs.depth = -self.depth * np.ones(len(obs.depth))
return obs
def convert_file(self, file, title="REMSS SST Obs"):
"""
Load an REMSS file and convert into an obs structure
"""
# Load REMSS Data
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(
nc.variables["sea_surface_temperature"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(np.squeeze(
nc.variables["sses_standard_deviation"][:]), 0.01, 2.0)
dat[err.mask] = np.ma.masked
# Check the data flags
if self.check_qc_flags:
flags = np.ma.masked_not_equal(
np.squeeze(nc.variables["quality_level"][:]), 5)
dat[flags.mask] = np.ma.masked
else:
dat = np.ma.masked_where(
np.squeeze(nc.variables["quality_level"][:]).data == 1, dat)
# Grab the observation time
time = netCDF4.num2date(nc.variables["time"][0],
nc.variables["time"].units) - self.epoch
dtime = nc.variables["sst_dtime"][:]
time = np.squeeze((time.total_seconds() + dtime) * seapy.secs2day)
nc.close()
if self.grid.east():
lon[lon < 0] += 360
good = dat.nonzero()
data = [seapy.roms.obs.raw_data("TEMP", self.provenance,
dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time[good], lon[good], lat[good],
None, data, self.dt, title)
def convert_file(self, file, title="NAVO SST Obs"):
"""
Load a NAVO map file and convert into an obs structure
"""
import re
import sys
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(nc.variables["analysed_sst"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.array(np.squeeze(
nc.variables["analysis_error"][:]), mask=dat.mask)
# this is an analyzed product and provides errors as a function
# of space and time directly the temperature is the bulk
# temperature (ie at around 4m depth, below the e-folding depths of
# sunlight in the ocean so the product does not have a diuranl cycle
# (ie you don;t have to worry about hourly variations)
time = seapy.roms.num2date(
nc, "time", records=[0], epoch=self.epoch)[0]
nc.close()
# here we set the depth to be 4 m below the surface
if self.grid.east():
lon[lon < 0] += 360
lon, lat = np.meshgrid(lon, lat)
good = dat.nonzero()
lat = lat[good]
lon = lon[good]
data = [seapy.roms.obs.raw_data("TEMP", self.provenance, dat.compressed(),
err[good], self.temp_error)]
# Grid it
obs = seapy.roms.obs.gridder(self.grid, time, lon, lat, None,
data, self.dt, depth_adjust=True, title=title)
obs.z *= 0
obs.depth = -self.depth * np.ones(len(obs.depth))
return obs
def convert_file(self, file, title="REMSS SST Obs"):
"""
Load an REMSS file and convert into an obs structure
"""
# Load REMSS Data
nc = seapy.netcdf(file)
lon = nc.variables["lon"][:]
lat = nc.variables["lat"][:]
dat = np.ma.masked_outside(np.squeeze(
nc.variables["sea_surface_temperature"][:]) - 273.15,
self.temp_limits[0], self.temp_limits[1])
err = np.ma.masked_outside(np.squeeze(
nc.variables["sses_standard_deviation"][:]), 0.01, 2.0)
dat[err.mask] = np.ma.masked
# Check the data flags
if self.check_qc_flags:
flags = np.ma.masked_not_equal(
np.squeeze(nc.variables["quality_level"][:]), 5)
dat[flags.mask] = np.ma.masked
else:
dat = np.ma.masked_where(
np.squeeze(nc.variables["quality_level"][:]).data == 1, dat)
# Grab the observation time
time = seapy.roms.num2date(nc, "time", records=[0])[0] - self.epoch
dtime = nc.variables["sst_dtime"][:]
time = np.squeeze((time.total_seconds() + dtime) * seapy.secs2day)
nc.close()
if self.grid.east():
lon[lon < 0] += 360
good = dat.nonzero()
data = [seapy.roms.obs.raw_data("TEMP", self.provenance,
dat.compressed(),
err[good], self.temp_error)]
# Grid it
return seapy.roms.obs.gridder(self.grid, time[good], lon[good], lat[good],
None, data, self.dt, title)
def merge_files(obs_files,
out_files,
days,
dt,
reftime,
limits=None,
clobber=True):
"""
merge together a group of observation files into combined new files
with observations that lie only within the corresponding dates
Parameters
----------
obs_files : list,
List of files to merge together (a single file will work, it will
just be filtered by the dates)
out_files : list or string,
list of the filenames to create for each of the output periods.
If a single string is given, the character '#' will be replaced
by the starting time of the observation (e.g. out_files="out_#.nc"
will become out_03234.nc)
days : list of tuples,
List of starting and ending day numbers for each cycle to process.
The first value is the start day, the second is the end day. The
number of tuples is the number of files to output.
dt : float,
Time separation of observations. Observations that are less than
dt apart in time will be set to the same time.
reftime :
Reference time used to process the observations. The merged files
are now timed in relation to the beginning of the assimilation cycle
limits : dict, optional
Set the limits of the grid points that observations are allowed
within, {'north':i, 'south':i, 'east':i, 'west':i }. As obs near
the boundaries are not advisable, this allows you to specify the
valid grid range to accept obs within.
clobber: bool, optional
If True, output files are overwritten. If False, they are skipped.
Returns
-------
None
Examples
--------
Put together three files into 5 separate files in two day intervals from
day 10 through day 20:
>>> merge_files(["obs_1.nc", "obs_2.nc", "obs_3.nc"], "new_#.nc",
[(i, i+2) for i in range(10, 20, 2)])
Put together same three files into 3 overlapping separate files in five
day intervals with one overlapping day:
>>> merge_files(["obs_1.nc", "obs_2.nc", "obs_3.nc"], "new_#.nc",
[(i, i+5) for i in range(10, 20, 4)])
"""
import re
import os
# Only unique files
obs_files = set().union(seapy.flatten(obs_files))
outtime = False
if isinstance(out_files, str):
outtime = True
time = re.compile('\#')
# Go through the files to determine which periods they cover
myobs = list()
sdays = list()
edays = list()
for file in obs_files:
nc = seapy.netcdf(file)
fdays = nc.variables['survey_time'][:]
nc.close()
l = np.where(
np.logical_and(fdays >= np.min(days), fdays <= np.max(days)))[0]
if not l.size:
continue
myobs.append(file)
sdays.append(fdays[0])
edays.append(fdays[-1])
sdays = np.asarray(sdays)
edays = np.asarray(edays)
# Loop over the dates in pairs
for n, t in enumerate(seapy.progressbar.progress(days)):
# Set output file name
if outtime:
outfile = time.sub("{:05d}".format(t[0]), out_files)
else:
outfile = out_files[n]
if os.path.exists(outfile) and not clobber:
continue
# Find the files that cover the current period
fidx = np.where(np.logical_and(sdays <= t[1], edays >= t[0]))[0]
if not fidx.size:
continue
# Create new observations for this time period
nobs = obs(myobs[fidx[0]])
l = np.where(np.logical_or(nobs.time < t[0], nobs.time > t[1]))
nobs.delete(l)
for idx in fidx[1:]:
o = obs(myobs[idx])
l = np.where(np.logical_and(o.time >= t[0], o.time <= t[1]))
nobs.add(o[l])
# Remove any limits
if limits is not None:
l = np.where(
np.logical_or.reduce(
(nobs.x < limits['west'], nobs.x > limits['east'],
nobs.y < limits['south'], nobs.y > limits['north'])))
nobs.delete(l)
# Make time relative to the assimilation window
nobs.reftime = reftime
#nobs.reftime = seapy.day2date(t[0],epoch=reftime)
#nobs.time = abs(abs(nobs.time) - abs(t[0]))
# Save out the new observations
nobs.to_netcdf(outfile, dt=dt)
pass
def __init__(self,
filename=None,
time=None,
x=None,
y=None,
z=None,
lat=None,
lon=None,
depth=None,
value=None,
error=None,
type=None,
provenance=None,
meta=None,
title="ROMS Observations"):
"""
Class to deal with ROMS observations for data assimilation
Parameters
----------
filename : string or list, optional,
if filename is given, the data are loaded from a netcdf file
time : ndarray, optional,
time of observation in days
x : ndarray, optional,
obs location on grid in x (eta)
y : ndarray, optional,
obs location on grid in y (xi)
z : ndarray, optional,
obs location on grid in z (positive layers or negative depth [m])
lat : ndarray, optional,
obs true latitude [deg]
lon : ndarray, optional,
obs true longitude [deg]
depth : ndarray, optional,
obs true depth [m]
value : ndarray, optional,
obs value [units]
error : ndarray, optional,
obs error [units**2]
type : ndarray, optional,
obs type [1-zeta, 2-ubar, 3-vbar, 4-u, 5-v, 6-temp, 7-salt]
provenance : ndarray, optional,
obs provenance
meta : ndarray, optional,
obs additional information
"""
self.title = title
if filename is not None:
nc = seapy.netcdf(filename)
# Construct an array from the data in the file. If obs_meta
# exists in the file, then load it; otherwise, fill with zeros
self.filename = filename
self.time = nc.variables["obs_time"][:]
self.x = nc.variables["obs_Xgrid"][:]
self.y = nc.variables["obs_Ygrid"][:]
self.z = nc.variables["obs_Zgrid"][:]
self.lat = nc.variables["obs_lat"][:]
self.lon = nc.variables["obs_lon"][:]
self.depth = nc.variables["obs_depth"][:]
self.value = nc.variables["obs_value"][:]
self.error = nc.variables["obs_error"][:]
self.type = nc.variables["obs_type"][:]
self.provenance = nc.variables["obs_provenance"][:]
# Update the provenance definitions
try:
obs_provenance.update(
dict((int(k.strip()), v.strip())
for v, k in (it.split(':')
for it in nc.obs_provenance.split(','))))
except (AttributeError, ValueError):
pass
try:
self.meta = nc.variables["obs_meta"][:]
except KeyError:
self.meta = np.zeros(self.value.size)
finally:
nc.close()
else:
self.filename = None
if time is not None:
self.time = np.atleast_1d(time)
if x is not None:
self.x = np.atleast_1d(x)
if y is not None:
self.y = np.atleast_1d(y)
if z is not None:
self.z = np.atleast_1d(z)
if lat is not None:
self.lat = np.atleast_1d(lat)
if lon is not None:
self.lon = np.atleast_1d(lon)
if depth is not None:
self.depth = np.atleast_1d(depth)
if value is not None:
self.value = np.atleast_1d(value)
if error is not None:
self.error = np.atleast_1d(error)
if type is not None:
self.type = astype(type)
if provenance is not None:
self.provenance = asprovenance(provenance)
else:
self.provenance = 0
if meta is not None:
self.meta = np.atleast_1d(meta)
self._consistent()
def gen_bulk_forcing(infile, fields, outfile, grid, start_time, end_time,
epoch=seapy.default_epoch, clobber=False):
"""
Given a source file (or URL), a dictionary that defines the
source fields mapped to the ROMS fields, then it will generate
a new bulk forcing file for ROMS.
Parameters
----------
infile: string,
The source file (or URL) to load the data from
fields: dict,
A dictionary of the fields to load and process. The dictionary
is composed of:
"frc_lat":STRING name of latitude field in forcing file
"frc_lon":STRING name of longitude field in forcing file
"frc_time":STRING name of time field in forcing file
"frc_time_units":STRING optional, supply units of frc time
field in forcing file
keys of ROMS bulk forcing field names (Tair, Pair, Qair,
rain, Uwind, Vwind, lwrad_down, swrad) each with an
array of values of a named tuple (forcing_data) with the
following fields:
field: STRING value of the forcing field to use
ratio: FLOAT value to multiply with the source data
offset: FLOAT value to add to the source data
outfile: string,
Name of the output file to create
grid: seapy.model.grid or string,
Grid to use for selecting spatial region
start_time: datetime,
Starting time of data to process
end_time: datetime,
Ending time of data to process
epoch: datetime,
Epoch to use for ROMS times
clobber: bool optional,
Delete existing file or not, default False
Returns
-------
None: Generates an output file of bulk forcings
Examples
--------
To generate GFS forcing for the grid "mygrid.nc" for the year
2014, then use the standard GFS map definitions (and even
the built-in GFS archive url):
>>> seapy.roms.forcing.gen_bulk_forcing(seapy.roms.forcing.gfs_url,
seapy.roms.forcing.gfs_map, 'my_forcing.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2014,1,1))
NCEP reanalysis is trickier as the files are broken up by
variable type; hence, a separate file will be created for
each variable. We can use the wildcards though to put together
multiple time period (e.g., 2014 through 2015).
>>> seapy.roms.forcing.gen_bulk_forcing("uwnd.10m.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=True)
>>> seapy.roms.forcing.gen_bulk_forcing("vwnd.10m.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=False)
>>> seapy.roms.forcing.gen_bulk_forcing("air.2m.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=False)
>>> seapy.roms.forcing.gen_bulk_forcing("dlwrf.sfc.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=False)
>>> seapy.roms.forcing.gen_bulk_forcing("dswrf.sfc.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=False)
>>> seapy.roms.forcing.gen_bulk_forcing("prate.sfc.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=False)
>>> seapy.roms.forcing.gen_bulk_forcing("rhum.sig995.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc_rhum_slp.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=True)
>>> seapy.roms.forcing.gen_bulk_forcing("slp.*nc",
seapy.roms.forcing.ncep_map, 'ncep_frc_rhum_slp.nc',
'mygrid.nc', datetime.datetime(2014,1,1),
datetime.datetime(2015,12,31)), clobber=False)
Two forcing files, 'ncep_frc.nc' and 'ncep_frc_rhum_slp.nc', are
generated for use with ROMS. NOTE: You will have to use 'ncks'
to eliminate the empty forcing fields between the two files
to prevent ROMS from loading them.
"""
# Load the grid
grid = seapy.model.asgrid(grid)
# Open the Forcing data
forcing = seapy.netcdf(infile)
# Gather the information about the forcing
if 'frc_time_units' in fields:
frc_time = netCDF4.num2date(forcing.variables[fields['frc_time']][:],
fields['frc_time_units'])
else:
frc_time = netCDF4.num2date(forcing.variables[fields['frc_time']][:],
forcing.variables[fields['frc_time']].units)
# Figure out the time records that are required
time_list = np.where(np.logical_and(frc_time >= start_time,
frc_time <= end_time))[0]
if not np.any(time_list):
raise Exception("Cannot find valid times")
# Get the latitude and longitude ranges
minlat = np.floor(np.min(grid.lat_rho)) - 0.5
maxlat = np.ceil(np.max(grid.lat_rho)) + 0.5
minlon = np.floor(np.min(grid.lon_rho)) - 0.5
maxlon = np.ceil(np.max(grid.lon_rho)) + 0.5
frc_lon = forcing.variables[fields['frc_lon']][:]
frc_lat = forcing.variables[fields['frc_lat']][:]
# Make the forcing lat/lon on 2D grid
if frc_lon.ndim == 3:
frc_lon = np.squeeze(frc_lon[0, :, :])
frc_lat = np.squeeze(frc_lat[0, :, :])
elif frc_lon.ndim == 1:
frc_lon, frc_lat = np.meshgrid(frc_lon, frc_lat)
# Find the values in our region
if not grid.east():
frc_lon[frc_lon > 180] -= 360
region_list = np.where(np.logical_and.reduce((
frc_lon <= maxlon,
frc_lon >= minlon,
frc_lat <= maxlat,
frc_lat >= minlat)))
if not np.any(region_list):
raise Exception("Cannot find valid region")
eta_list = np.s_[np.min(region_list[0]):np.max(region_list[0]) + 1]
xi_list = np.s_[np.min(region_list[1]):np.max(region_list[1]) + 1]
frc_lon = frc_lon[eta_list, xi_list]
frc_lat = frc_lat[eta_list, xi_list]
# Create the output file
out = seapy.roms.ncgen.create_frc_bulk(outfile, lat=frc_lat.shape[0],
lon=frc_lon.shape[1], reftime=epoch,
clobber=clobber)
out.variables['frc_time'][:] = netCDF4.date2num(frc_time[time_list],
out.variables['frc_time'].units)
out.variables['lat'][:] = frc_lat
out.variables['lon'][:] = frc_lon
# Loop over the fields and fill out the output file
for f in seapy.progressbar.progress(list(set(fields.keys()) & (out.variables.keys()))):
if hasattr(fields[f], 'field'):
out.variables[f][:] = \
forcing.variables[fields[f].field][time_list, eta_list, xi_list] * \
fields[f].ratio + fields[f].offset
out.sync()
out.close()
def __init__(self, filename=None, time=None, x=None, y=None, z=None,
lat=None, lon=None, depth=None, value=None, error=None,
type=None, provenance=None, meta=None,
title="ROMS Observations"):
"""
Class to deal with ROMS observations for data assimilation
Parameters
----------
filename : string or list, optional,
if filename is given, the data are loaded from a netcdf file
time : ndarray, optional,
time of observation in days
x : ndarray, optional,
obs location on grid in x (eta)
y : ndarray, optional,
obs location on grid in y (xi)
z : ndarray, optional,
obs location on grid in z (positive layers or negative depth [m])
lat : ndarray, optional,
obs true latitude [deg]
lon : ndarray, optional,
obs true longitude [deg]
depth : ndarray, optional,
obs true depth [m]
value : ndarray, optional,
obs value [units]
error : ndarray, optional,
obs error [units**2]
type : ndarray, optional,
obs type [1-zeta, 2-ubar, 3-vbar, 4-u, 5-v, 6-temp, 7-salt]
provenance : ndarray, optional,
obs provenance
meta : ndarray, optional,
obs additional information
"""
self.title = title
if filename is not None:
nc = seapy.netcdf(filename)
# Construct an array from the data in the file. If obs_meta
# exists in the file, then load it; otherwise, fill with zeros
self.time = nc.variables["obs_time"][:]
self.x = nc.variables["obs_Xgrid"][:]
self.y = nc.variables["obs_Ygrid"][:]
self.z = nc.variables["obs_Zgrid"][:]
self.lat = nc.variables["obs_lat"][:]
self.lon = nc.variables["obs_lon"][:]
self.depth = nc.variables["obs_depth"][:]
self.value = nc.variables["obs_value"][:]
self.error = nc.variables["obs_error"][:]
self.type = nc.variables["obs_type"][:]
self.provenance = nc.variables["obs_provenance"][:]
# Update the provenance definitions
try:
obs_provenance.update(dict((int(k.strip()), v.strip())
for v, k in
(it.split(':') for it in
nc.obs_provenance.split(','))))
except (AttributeError, ValueError):
pass
try:
self.meta = nc.variables["obs_meta"][:]
except KeyError:
self.meta = np.zeros(self.value.size)
finally:
nc.close()
else:
if time is not None:
self.time = np.atleast_1d(time)
if x is not None:
self.x = np.atleast_1d(x)
if y is not None:
self.y = np.atleast_1d(y)
if z is not None:
self.z = np.atleast_1d(z)
if lat is not None:
self.lat = np.atleast_1d(lat)
if lon is not None:
self.lon = np.atleast_1d(lon)
if depth is not None:
self.depth = np.atleast_1d(depth)
if value is not None:
self.value = np.atleast_1d(value)
if error is not None:
self.error = np.atleast_1d(error)
if type is not None:
self.type = astype(type)
if provenance is not None:
self.provenance = asprovenance(provenance)
else:
self.provenance = 0
if meta is not None:
self.meta = np.atleast_1d(meta)
self._consistent()
import sys
import seapy
import numpy as np
try:
infile = sys.argv[1]
outfile = sys.argv[2]
except:
print("Usage: {:s} input_file output_file".format(sys.argv[0]))
sys.exit()
print("Convert {:s} to {:s}".format(infile, outfile))
maxrecs = 30
# Get the parameters
inc = seapy.netcdf(infile)
lat = len(inc.dimensions['lat'])
lon = len(inc.dimensions['lon'])
epoch, tvar = seapy.roms.get_reftime(inc)
# Create the new file
onc = seapy.roms.ncgen.create_frc_bulk(
outfile, lat=lat, lon=lon, reftime=epoch, clobber=True)
# Save the times
onc.variables['time'][:] = inc.variables[tvar][:]
ntimes = len(onc.dimensions['time'])
onc.variables['lat'][:] = inc.variables['lat'][:]
onc.variables['lon'][:] = inc.variables['lon'][:]
# Copy the variables
def convert_file(self, file, title="Argo Obs"):
"""
Load an Argo file and convert into an obs structure
"""
nc = seapy.netcdf(file, aggdim="N_PROF")
# Load the position of all profiles in the file
lon = nc.variables["LONGITUDE"][:]
lat = nc.variables["LATITUDE"][:]
pro_q = nc.variables["POSITION_QC"][:].astype(int)
# Find the profiles that are in our area with known locations quality
if self.grid.east():
lon[lon < 0] += 360
profile_list = np.where(np.logical_and.reduce((
lat >= np.min(self.grid.lat_rho),
lat <= np.max(self.grid.lat_rho),
lon >= np.min(self.grid.lon_rho),
lon <= np.max(self.grid.lon_rho),
pro_q == 1)))[0]
# Check which are good profiles
profile_qc = nc.variables["PROFILE_PRES_QC"][
profile_list].astype('<U1')
profile_list = profile_list[profile_qc == 'A']
if not profile_list.size:
return None
# Load only the data from those in our area
julian_day = nc.variables["JULD_LOCATION"][profile_list]
argo_epoch = datetime.datetime.strptime(''.join(
nc.variables["REFERENCE_DATE_TIME"][:].astype('<U1')), '%Y%m%d%H%M%S')
time_delta = (self.epoch - argo_epoch).days
file_stamp = datetime.datetime.strptime(''.join(
nc.variables["DATE_CREATION"][:].astype('<U1')), '%Y%m%d%H%M%S')
# Grab data over the previous day
file_time = np.minimum((file_stamp - argo_epoch).days,
int(np.max(julian_day)))
time_list = np.where(julian_day >= file_time - 1)[0]
julian_day = julian_day[time_list]
lon = lon[profile_list[time_list]]
lat = lat[profile_list[time_list]]
profile_list = profile_list[time_list]
# Load the data in our region and time
temp = nc.variables["TEMP"][profile_list, :]
temp_qc = nc.variables["TEMP_QC"][profile_list, :]
salt = nc.variables["PSAL"][profile_list, :]
salt_qc = nc.variables["PSAL_QC"][profile_list, :]
pres = nc.variables["PRES"][profile_list, :]
pres_qc = nc.variables["PRES_QC"][profile_list, :]
nc.close()
# Ensure consistency
full_mask = np.logical_or.reduce((temp.mask, salt.mask, pres.mask))
temp[full_mask] = np.ma.masked
temp_qc[full_mask] = np.ma.masked
salt[full_mask] = np.ma.masked
salt_qc[full_mask] = np.ma.masked
pres[full_mask] = np.ma.masked
pres_qc[full_mask] = np.ma.masked
# Combine the QC codes
qc = np.mean(np.vstack((temp_qc.compressed(), salt_qc.compressed(),
pres_qc.compressed())).astype(int), axis=0)
good_data = np.where(qc == 1)
# Put everything together into individual observations
time = np.resize(julian_day - time_delta,
pres.shape[::-1]).T[~temp.mask][good_data]
lat = np.resize(lat, pres.shape[::-1]).T[~temp.mask][good_data]
lon = np.resize(lon, pres.shape[::-1]).T[~temp.mask][good_data]
depth = -seapy.seawater.depth(pres.compressed()[good_data], lat)
# Apply the limits
temp = np.ma.masked_outside(temp.compressed()[good_data],
self.temp_limits[0], self.temp_limits[1])
salt = np.ma.masked_outside(salt.compressed()[good_data],
self.salt_limits[0], self.salt_limits[1])
data = [seapy.roms.obs.raw_data("TEMP", "CTD_ARGO", temp,
None, self.temp_error),
seapy.roms.obs.raw_data("SALT", "CTD_ARGO", salt,
None, self.salt_error)]
return seapy.roms.obs.gridder(self.grid, time, lon, lat, depth,
data, self.dt, title)
def to_clim(src_file, dest_file, dest_grid=None, records=None,
clobber=False, cdl=None, threads=2, reftime=None,
nx=0, ny=0, weight=10, vmap=None, pmap=None):
"""
Given an model output file, create (if does not exit) a
new ROMS climatology file using the given ROMS destination grid and
interpolate the ROMS fields onto the new grid. If an existing destination
file is given, it is interpolated onto the specified.
Parameters
----------
src_file : string,
Filename of src file to interpolate from
dest_file : string,
Name of desination file to write to
dest_grid: (string or seapy.model.grid), optional:
Name or instance of output definition
records : numpy.ndarray, optional:
Record indices to interpolate
clobber: bool, optional
If True, clobber any existing files and recreate. If False, use
the existing file definition
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
threads : int, optional:
number of processing threads
reftime: datetime, optional:
Reference time as the epoch for climatology file
nx : float, optional:
decorrelation length-scale for OA (same units as source data)
ny : float, optional:
decorrelation length-scale for OA (same units as source data)
weight : int, optional:
number of points to use in weighting matrix
vmap : dictionary, optional
mapping source and destination variables
pmap : numpy.ndarray, optional:
use the specified pmap rather than compute it
Returns
-------
pmap : ndarray
the weighting matrix computed during the interpolation
"""
if dest_grid is not None:
destg = seapy.model.asgrid(dest_grid)
src_grid = seapy.model.asgrid(src_file)
ncsrc = seapy.netcdf(src_file)
src_ref, time = seapy.roms.get_reftime(ncsrc)
if reftime is not None:
src_ref = reftime
records = np.arange(0, ncsrc.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
ncout = seapy.roms.ncgen.create_clim(dest_file,
eta_rho=destg.ln,
xi_rho=destg.lm,
s_rho=destg.n,
reftime=src_ref,
clobber=clobber,
cdl=cdl,
title="interpolated from " + src_file)
src_time = netCDF4.num2date(ncsrc.variables[time][records],
ncsrc.variables[time].units)
ncout.variables["clim_time"][:] = netCDF4.date2num(
src_time, ncout.variables["clim_time"].units)
ncsrc.close()
else:
raise AttributeError(
"you must supply a destination file or a grid to make the file")
# Call the interpolation
try:
src_grid.set_east(destg.east())
pmap = __interp_grids(src_grid, destg, ncout, records=records, threads=threads,
nx=nx, ny=ny, vmap=vmap, weight=weight, pmap=pmap)
except TimeoutError:
print("Timeout: process is hung, deleting output.")
# Delete the output file
os.remove(dest_file)
finally:
# Clean up
ncout.close()
return pmap
def gen_std_i(roms_file, std_file, std_window=5, pad=1, skip=30, fields=None):
"""
Create a std file for the given ocean fields. This std file can be used
for initial conditions constraint in 4D-Var. This requires a long-term
model spinup file from which to compute the standard deviation.
Parameters
----------
roms_file: string or list of strings,
The ROMS (history or average) file from which to compute the std. If
it is a list of strings, a netCDF4.MFDataset is opened instead.
std_file: string,
The name of the file to store the standard deviations fields
std_window: int,
The size of the window (in number of records) to compute the std over
pad: int,
How much to pad each side of the window for overlap. For example,
std_window=10 and pad=2 would give a total window of 14 with 2 records
used in the prior window and 2 in the post window as well.
skip: int,
How many records to skip at the beginning of the file
fields: list of str,
The fields to compute std for. Default is to use the ROMS prognostic
variables.
Returns
-------
None
"""
# Create the fields to process
if fields is None:
fields = set(seapy.roms.fields)
# Open the ROMS info
grid = seapy.model.asgrid(roms_file)
nc = seapy.netcdf(roms_file)
# Filter the fields for the ones in the ROMS file
fields = set(nc.variables).intersection(fields)
# Build the output file
time_var = seapy.roms.get_timevar(nc)
epoch = netCDF4.num2date(0, nc.variables[time_var].units)
time = nc.variables[time_var][:]
ncout = seapy.roms.ncgen.create_da_ini_std(std_file,
eta_rho=grid.ln, xi_rho=grid.lm, s_rho=grid.n,
reftime=epoch, title="std from " + str(roms_file))
grid.to_netcdf(ncout)
# If there are any fields that are not in the standard output file,
# add them to the output file
for f in fields.difference(ncout.variables):
ncout.createVariable(f, np.float32,
('ocean_time', "s_rho", "eta_rho", "xi_rho"))
# Loop over the time with the variance window:
for n, t in enumerate(seapy.progressbar.progress(np.arange(skip + pad,
len(time) - std_window - pad, std_window))):
idx = np.arange(t - pad, t + std_window + pad)
ncout.variables[time_var][n] = np.mean(time[idx])
for v in fields:
dat = nc.variables[v][idx, :].std(axis=0)
dat[dat > 10] = 0.0
ncout.variables[v][n, :] = dat
ncout.sync()
ncout.close()
nc.close()
def to_zgrid(roms_file, z_file, z_grid=None, depth=None, records=None,
threads=2, reftime=None, nx=0, ny=0, weight=10, vmap=None,
cdl=None, dims=2, pmap=None):
"""
Given an existing ROMS history or average file, create (if does not exit)
a new z-grid file. Use the given z_grid or otherwise build one with the
same horizontal extent and the specified depths and interpolate the
ROMS fields onto the z-grid.
Parameters
----------
roms_file : string,
File name of src file to interpolate from
z_file : string,
Name of desination file to write to
z_grid: (string or seapy.model.grid), optional:
Name or instance of output definition
depth: numpy.ndarray, optional:
array of depths to use for z-level
records : numpy.ndarray, optional:
Record indices to interpolate
threads : int, optional:
number of processing threads
reftime: datetime, optional:
Reference time as the epoch for z-grid file
nx : float, optional:
decorrelation length-scale for OA (same units as source data)
ny : float, optional:
decorrelation length-scale for OA (same units as source data)
weight : int, optional:
number of points to use in weighting matrix
vmap : dictionary, optional
mapping source and destination variables
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
dims : int, optional
number of dimensions to use for lat/lon arrays (default 2)
pmap : numpy.ndarray, optional:
use the specified pmap rather than compute it
Returns
-------
pmap : ndarray
the weighting matrix computed during the interpolation
"""
roms_grid = seapy.model.asgrid(roms_file)
ncroms = seapy.netcdf(roms_file)
src_ref, time = seapy.roms.get_reftime(ncroms)
if reftime is not None:
src_ref = reftime
records = np.arange(0, ncroms.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
# Load the grid
if z_grid is not None:
z_grid = seapy.model.asgrid(z_grid)
elif os.path.isfile(z_file):
z_grid = seapy.model.asgrid(z_file)
if not os.path.isfile(z_file):
if z_grid is None:
lat = roms_grid.lat_rho.shape[0]
lon = roms_grid.lat_rho.shape[1]
if depth is None:
raise ValueError("depth must be specified")
ncout = seapy.roms.ncgen.create_zlevel(z_file, lat, lon,
len(depth), src_ref, "ROMS z-level",
cdl=cdl, dims=dims)
if dims == 1:
ncout.variables["lat"][:] = roms_grid.lat_rho[:, 0]
ncout.variables["lon"][:] = roms_grid.lon_rho[0, :]
else:
ncout.variables["lat"][:] = roms_grid.lat_rho
ncout.variables["lon"][:] = roms_grid.lon_rho
ncout.variables["depth"][:] = depth
ncout.variables["mask"][:] = roms_grid.mask_rho
ncout.sync()
z_grid = seapy.model.grid(z_file)
else:
lat = z_grid.lat_rho.shape[0]
lon = z_grid.lat_rho.shape[1]
dims = z_grid.spatial_dims
ncout = seapy.roms.ncgen.create_zlevel(z_file, lat, lon,
len(z_grid.z), src_ref, "ROMS z-level",
cdl=cdl, dims=dims)
if dims == 1:
ncout.variables["lat"][:] = z_grid.lat_rho[:, 0]
ncout.variables["lon"][:] = z_grid.lon_rho[0, :]
else:
ncout.variables["lat"][:] = z_grid.lat_rho
ncout.variables["lon"][:] = z_grid.lon_rho
ncout.variables["depth"][:] = z_grid.z
ncout.variables["mask"][:] = z_grid.mask_rho
else:
ncout = netCDF4.Dataset(z_file, "a")
ncout.variables["time"][:] = netCDF4.date2num(
netCDF4.num2date(ncroms.variables[time][records],
ncroms.variables[time].units),
ncout.variables["time"].units)
ncroms.close()
# Call the interpolation
try:
roms_grid.set_east(z_grid.east())
pmap = __interp_grids(roms_grid, z_grid, ncout, records=records,
threads=threads, nx=nx, ny=ny, vmap=vmap, weight=weight,
z_mask=True, pmap=pmap)
except TimeoutError:
print("Timeout: process is hung, deleting output.")
# Delete the output file
os.remove(z_file)
finally:
# Clean up
ncout.close()
return pmap
def to_grid(src_file, dest_file, dest_grid=None, records=None, threads=2,
reftime=None, nx=0, ny=0, weight=10, vmap=None, pmap=None):
"""
Given an existing model file, create (if does not exit) a
new ROMS history file using the given ROMS destination grid and
interpolate the ROMS fields onto the new grid. If an existing destination
file is given, it is interpolated onto the specified.
Parameters
----------
src_file : string,
Filename of src file to interpolate from
dest_file : string,
Name of desination file to write to
dest_grid: (string or seapy.model.grid), optional:
Name or instance of output definition
records : numpy.ndarray, optional:
Record indices to interpolate
threads : int, optional:
number of processing threads
reftime: datetime, optional:
Reference time as the epoch for ROMS file
nx : float, optional:
decorrelation length-scale for OA (same units as source data)
ny : float, optional:
decorrelation length-scale for OA (same units as source data)
weight : int, optional:
number of points to use in weighting matrix
vmap : dictionary, optional
mapping source and destination variables
pmap : numpy.ndarray, optional:
use the specified pmap rather than compute it
Returns
-------
pmap : ndarray
the weighting matrix computed during the interpolation
"""
src_grid = seapy.model.asgrid(src_file)
if dest_grid is not None:
destg = seapy.model.asgrid(dest_grid)
if not os.path.isfile(dest_file):
ncsrc = seapy.netcdf(src_file)
src_ref, time = seapy.roms.get_reftime(ncsrc)
if reftime is not None:
src_ref = reftime
records = np.arange(0, ncsrc.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
ncout = seapy.roms.ncgen.create_ini(dest_file,
eta_rho=destg.eta_rho,
xi_rho=destg.xi_rho,
s_rho=destg.n,
reftime=src_ref,
title="interpolated from " + src_file)
destg.to_netcdf(ncout)
ncout.variables["ocean_time"][:] = netCDF4.date2num(
netCDF4.num2date(ncsrc.variables[time][records],
ncsrc.variables[time].units),
ncout.variables["ocean_time"].units)
ncsrc.close()
if os.path.isfile(dest_file):
ncout = netCDF4.Dataset(dest_file, "a")
if dest_grid is None:
destg = seapy.model.asgrid(dest_file)
# Call the interpolation
try:
src_grid.set_east(destg.east())
pmap = __interp_grids(src_grid, destg, ncout, records=records,
threads=threads, nx=nx, ny=ny, weight=weight,
vmap=vmap, pmap=pmap)
except TimeoutError:
print("Timeout: process is hung, deleting output.")
# Delete the output file
os.remove(dest_file)
finally:
# Clean up
ncout.close()
return pmap
def __interp_grids(src_grid, child_grid, ncout, records=None,
threads=2, nx=0, ny=0, weight=10, vmap=None, z_mask=False,
pmap=None):
"""
internal method: Given a model file (average, history, etc.),
interpolate the fields onto another gridded file.
Parameters
----------
src_grid : seapy.model.grid data source (History, Average, etc. file)
child_grid : seapy.model.grid output data grid
ncout : netcdf output file
[records] : array of the record indices to interpolate
[threads] : number of processing threads
[nx] : decorrelation length in grid-cells for x
[ny] : decorrelation length in grid-cells for y
[vmap] : variable name mapping
[z_mask] : mask out depths in z-grids
[pmap] : use the specified pmap rather than compute it
Returns
-------
None
"""
# If we don't have a variable map, then do a one-to-one mapping
if vmap is None:
vmap = dict()
for k in seapy.roms.fields:
vmap[k] = k
# Generate a file to store the pmap information
sname = getattr(src_grid, 'name', None)
cname = getattr(child_grid, 'name', None)
pmap_file = None if any(v is None for v in (sname, cname)) else \
sname + "_" + cname + "_pmap.npz"
# Create or load the pmaps depending on if they exist
if nx == 0:
if hasattr(src_grid, "dm") and hasattr(child_grid, "dm"):
nx = np.ceil(np.mean(src_grid.dm) / np.mean(child_grid.dm))
else:
nx = 5
if ny == 0:
if hasattr(src_grid, "dn") and hasattr(child_grid, "dn"):
ny = np.ceil(np.mean(src_grid.dn) / np.mean(child_grid.dn))
else:
ny = 5
if pmap is None:
if pmap_file is not None and os.path.isfile(pmap_file):
pmap = np.load(pmap_file)
else:
tmp = np.ma.masked_equal(src_grid.mask_rho, 0)
tmp, pmaprho = seapy.oasurf(src_grid.lon_rho, src_grid.lat_rho,
tmp, child_grid.lon_rho, child_grid.lat_rho,
weight=weight, nx=nx, ny=ny)
tmp = np.ma.masked_equal(src_grid.mask_u, 0)
tmp, pmapu = seapy.oasurf(src_grid.lon_u, src_grid.lat_u,
tmp, child_grid.lon_rho, child_grid.lat_rho,
weight=weight, nx=nx, ny=ny)
tmp = np.ma.masked_equal(src_grid.mask_v, 0)
tmp, pmapv = seapy.oasurf(src_grid.lon_v, src_grid.lat_v,
tmp, child_grid.lon_rho, child_grid.lat_rho,
weight=weight, nx=nx, ny=ny)
if pmap_file is not None:
np.savez(pmap_file, pmaprho=pmaprho, pmapu=pmapu, pmapv=pmapv)
pmap = {"pmaprho": pmaprho, "pmapu": pmapu, "pmapv": pmapv}
# Get the time field
ncsrc = seapy.netcdf(src_grid.filename)
time = seapy.roms.get_timevar(ncsrc)
# Interpolate the depths from the source to final grid
src_depth = np.min(src_grid.depth_rho, 0)
dst_depth = __interp2_thread(src_grid.lon_rho, src_grid.lat_rho, src_depth,
child_grid.lon_rho, child_grid.lat_rho, pmap[
"pmaprho"],
weight, nx, ny, child_grid.mask_rho)
# Interpolate the scalar fields
records = np.arange(0, ncsrc.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
for src in vmap:
dest = vmap[src]
# Extra fields will probably be user tracers (biogeochemical)
fld = seapy.roms.fields.get(dest, {"dims": 3})
# Only interpolate the fields we want in the destination
if (dest not in ncout.variables) or ("rotate" in fld):
continue
if fld["dims"] == 2:
# Compute the max number of hold in memory
maxrecs = np.maximum(1, np.minimum(len(records),
np.int(_max_memory / (child_grid.lon_rho.nbytes +
src_grid.lon_rho.nbytes))))
for rn, recs in enumerate(seapy.chunker(records, maxrecs)):
outr = np.s_[
rn * maxrecs:np.minimum((rn + 1) * maxrecs, len(records))]
ndata = np.ma.array(Parallel(n_jobs=threads, verbose=2, max_nbytes=_max_memory)
(delayed(__interp2_thread)(
src_grid.lon_rho, src_grid.lat_rho,
ncsrc.variables[src][i, :, :],
child_grid.lon_rho, child_grid.lat_rho,
pmap["pmaprho"], weight,
nx, ny, child_grid.mask_rho)
for i in recs), copy=False)
ncout.variables[dest][outr, :, :] = ndata
ncout.sync()
else:
maxrecs = np.maximum(1, np.minimum(
len(records), np.int(_max_memory /
(child_grid.lon_rho.nbytes *
child_grid.n +
src_grid.lon_rho.nbytes *
src_grid.n))))
for rn, recs in enumerate(seapy.chunker(records, maxrecs)):
outr = np.s_[
rn * maxrecs:np.minimum((rn + 1) * maxrecs, len(records))]
ndata = np.ma.array(Parallel(n_jobs=threads, verbose=2, max_nbytes=_max_memory)
(delayed(__interp3_thread)(
src_grid.lon_rho, src_grid.lat_rho,
src_grid.depth_rho,
ncsrc.variables[src][i, :, :, :],
child_grid.lon_rho, child_grid.lat_rho,
child_grid.depth_rho,
pmap["pmaprho"], weight,
nx, ny, child_grid.mask_rho,
up_factor=_up_scaling.get(dest, 1.0),
down_factor=_down_scaling.get(dest, 1.0))
for i in recs), copy=False)
if z_mask:
__mask_z_grid(ndata, dst_depth, child_grid.depth_rho)
ncout.variables[dest][outr, :, :, :] = ndata
ncout.sync()
# Rotate and Interpolate the vector fields. First, determine which
# are the "u" and the "v" vmap fields
try:
velmap = {
"u": list(vmap.keys())[list(vmap.values()).index("u")],
"v": list(vmap.keys())[list(vmap.values()).index("v")]}
except:
warn("velocity not present in source file")
return
srcangle = src_grid.angle if src_grid.cgrid else None
dstangle = child_grid.angle if child_grid.cgrid else None
maxrecs = np.minimum(len(records),
np.int(_max_memory /
(2 * (child_grid.lon_rho.nbytes *
child_grid.n +
src_grid.lon_rho.nbytes *
src_grid.n))))
for nr, recs in enumerate(seapy.chunker(records, maxrecs)):
vel = Parallel(n_jobs=threads, verbose=2, max_nbytes=_max_memory)(delayed(__interp3_vel_thread)(
src_grid.lon_rho, src_grid.lat_rho,
src_grid.depth_rho, srcangle,
ncsrc.variables[velmap["u"]][i, :, :, :],
ncsrc.variables[velmap["v"]][i, :, :, :],
child_grid.lon_rho, child_grid.lat_rho,
child_grid.depth_rho, dstangle,
pmap["pmaprho"], weight, nx, ny,
child_grid.mask_rho) for i in recs)
for j in range(len(vel)):
vel_u = np.ma.array(vel[j][0], copy=False)
vel_v = np.ma.array(vel[j][1], copy=False)
if z_mask:
__mask_z_grid(vel_u, dst_depth, child_grid.depth_rho)
__mask_z_grid(vel_v, dst_depth, child_grid.depth_rho)
if child_grid.cgrid:
vel_u = seapy.model.rho2u(vel_u)
vel_v = seapy.model.rho2v(vel_v)
ncout.variables["u"][nr * maxrecs + j, :] = vel_u
ncout.variables["v"][nr * maxrecs + j, :] = vel_v
if "ubar" in ncout.variables:
# Create ubar and vbar
# depth = seapy.adddim(child_grid.depth_u, vel_u.shape[0])
ncout.variables["ubar"][nr * maxrecs + j, :] = \
np.sum(vel_u * child_grid.depth_u, axis=0) / \
np.sum(child_grid.depth_u, axis=0)
if "vbar" in ncout.variables:
# depth = seapy.adddim(child_grid.depth_v, vel_v.shape[0])
ncout.variables["vbar"][nr * maxrecs + j, :] = \
np.sum(vel_v * child_grid.depth_v, axis=0) / \
np.sum(child_grid.depth_v, axis=0)
ncout.sync()
# Return the pmap that was used
return pmap
import sys
import seapy
import numpy as np
try:
infile = sys.argv[1]
outfile = sys.argv[2]
except:
print("Usage: {:s} input_file output_file".format(sys.argv[0]))
sys.exit()
print("Convert {:s} to {:s}".format(infile, outfile))
maxrecs = 30
# Get the parameters
inc = seapy.netcdf(infile)
eta_rho = len(inc.dimensions['eta_rho'])
xi_rho = len(inc.dimensions['xi_rho'])
s_rho = len(inc.dimensions['s_rho'])
epoch, tvar = seapy.roms.get_reftime(inc)
# Create the new file
onc = seapy.roms.ncgen.create_clim(
outfile, eta_rho=eta_rho, xi_rho=xi_rho, s_rho=s_rho, reftime=epoch, clobber=True)
# Save the times
onc.variables['clim_time'][:] = inc.variables[tvar][:]
ntimes = len(onc.dimensions['clim_time'])
# Copy the variables
for v in seapy.roms.fields:
def to_zgrid(roms_file, z_file, src_grid=None, z_grid=None, depth=None,
records=None, threads=2, reftime=None, nx=0, ny=0, weight=10,
vmap=None, cdl=None, dims=2, pmap=None):
"""
Given an existing ROMS history or average file, create (if does not exit)
a new z-grid file. Use the given z_grid or otherwise build one with the
same horizontal extent and the specified depths and interpolate the
ROMS fields onto the z-grid.
Parameters
----------
roms_file : string,
File name of src file to interpolate from
z_file : string,
Name of desination file to write to
src_grid : (string or seapy.model.grid), optional:
Name or instance of source grid. If nothing is specified,
derives grid from the roms_file
z_grid: (string or seapy.model.grid), optional:
Name or instance of output definition
depth: numpy.ndarray, optional:
array of depths to use for z-level
records : numpy.ndarray, optional:
Record indices to interpolate
threads : int, optional:
number of processing threads
reftime: datetime, optional:
Reference time as the epoch for z-grid file
nx : float, optional:
decorrelation length-scale for OA (same units as source data)
ny : float, optional:
decorrelation length-scale for OA (same units as source data)
weight : int, optional:
number of points to use in weighting matrix
vmap : dictionary, optional
mapping source and destination variables
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
dims : int, optional
number of dimensions to use for lat/lon arrays (default 2)
pmap : numpy.ndarray, optional:
use the specified pmap rather than compute it
Returns
-------
pmap : ndarray
the weighting matrix computed during the interpolation
"""
if src_grid is None:
src_grid = seapy.model.asgrid(roms_file)
else:
src_grid = seapy.model.asgrid(src_grid)
ncsrc = seapy.netcdf(roms_file)
src_ref, time = seapy.roms.get_reftime(ncsrc)
if reftime is not None:
src_ref = reftime
records = np.arange(0, ncsrc.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
# Load the grid
if z_grid is not None:
z_grid = seapy.model.asgrid(z_grid)
elif os.path.isfile(z_file):
z_grid = seapy.model.asgrid(z_file)
if not os.path.isfile(z_file):
if z_grid is None:
lat = src_grid.lat_rho.shape[0]
lon = src_grid.lat_rho.shape[1]
if depth is None:
raise ValueError("depth must be specified")
ncout = seapy.roms.ncgen.create_zlevel(z_file, lat, lon,
len(depth), src_ref, "ROMS z-level",
cdl=cdl, dims=dims)
if dims == 1:
ncout.variables["lat"][:] = src_grid.lat_rho[:, 0]
ncout.variables["lon"][:] = src_grid.lon_rho[0, :]
else:
ncout.variables["lat"][:] = src_grid.lat_rho
ncout.variables["lon"][:] = src_grid.lon_rho
ncout.variables["depth"][:] = depth
ncout.variables["mask"][:] = src_grid.mask_rho
ncout.sync()
z_grid = seapy.model.grid(z_file)
else:
lat = z_grid.lat_rho.shape[0]
lon = z_grid.lat_rho.shape[1]
dims = z_grid.spatial_dims
ncout = seapy.roms.ncgen.create_zlevel(z_file, lat, lon,
len(z_grid.z), src_ref, "ROMS z-level",
cdl=cdl, dims=dims)
if dims == 1:
ncout.variables["lat"][:] = z_grid.lat_rho[:, 0]
ncout.variables["lon"][:] = z_grid.lon_rho[0, :]
else:
ncout.variables["lat"][:] = z_grid.lat_rho
ncout.variables["lon"][:] = z_grid.lon_rho
ncout.variables["depth"][:] = z_grid.z
ncout.variables["mask"][:] = z_grid.mask_rho
else:
ncout = netCDF4.Dataset(z_file, "a")
ncout.variables["time"][:] = seapy.roms.date2num(
seapy.roms.num2date(ncsrc, time, records), ncout, "time")
# Call the interpolation
try:
src_grid.set_east(z_grid.east())
pmap = __interp_grids(src_grid, z_grid, ncsrc, ncout, records=records,
threads=threads, nx=nx, ny=ny, vmap=vmap, weight=weight,
z_mask=True, pmap=pmap)
except TimeoutError:
print("Timeout: process is hung, deleting output.")
# Delete the output file
os.remove(z_file)
finally:
# Clean up
ncsrc.close()
ncout.close()
return pmap
def merge_files(obs_files, out_files, days, dt, limits=None, clobber=True):
"""
merge together a group of observation files into combined new files
with observations that lie only within the corresponding dates
Parameters
----------
obs_files : list,
List of files to merge together (a single file will work, it will
just be filtered by the dates)
out_files : list or string,
list of the filenames to create for each of the output periods.
If a single string is given, the character '#' will be replaced
by the starting time of the observation (e.g. out_files="out_#.nc"
will become out_03234.nc)
days : list of tuples,
List of starting and ending day numbers for each cycle to process.
The first value is the start day, the second is the end day. The
number of tuples is the number of files to output.
dt : float,
Time separation of observations. Observations that are less than
dt apart in time will be set to the same time.
limits : dict, optional
Set the limits of the grid points that observations are allowed
within, {'north':i, 'south':i, 'east':i, 'west':i }. As obs near
the boundaries are not advisable, this allows you to specify the
valid grid range to accept obs within.
clobber: bool, optional
If True, output files are overwritten. If False, they are skipped.
Returns
-------
None
Examples
--------
Put together three files into 5 separate files in two day intervals from
day 10 through day 20:
>>> merge_files(["obs_1.nc", "obs_2.nc", "obs_3.nc"], "new_#.nc",
[(i, i+2) for i in range(10, 20, 2)])
Put together same three files into 3 overlapping separate files in five
day intervals with one overlapping day:
>>> merge_files(["obs_1.nc", "obs_2.nc", "obs_3.nc"], "new_#.nc",
[(i, i+5) for i in range(10, 20, 4)])
"""
import re
import os
# Only unique files
obs_files = set().union(seapy.flatten(obs_files))
outtime = False
if isinstance(out_files, str):
outtime = True
time = re.compile('\#')
# Go through the files to determine which periods they cover
myobs = list()
sdays = list()
edays = list()
for file in obs_files:
nc = seapy.netcdf(file)
fdays = nc.variables['survey_time'][:]
nc.close()
l = np.where(np.logical_and(fdays >= np.min(days),
fdays <= np.max(days)))[0]
if not l.size:
continue
myobs.append(file)
sdays.append(fdays[0])
edays.append(fdays[-1])
sdays = np.asarray(sdays)
edays = np.asarray(edays)
# Loop over the dates in pairs
for n, t in enumerate(seapy.progressbar.progress(days)):
# Set output file name
if outtime:
outfile = time.sub("{:05d}".format(t[0]), out_files)
else:
outfile = out_files[n]
if os.path.exists(outfile) and not clobber:
continue
# Find the files that cover the current period
fidx = np.where(np.logical_and(sdays <= t[1], edays >= t[0]))[0]
if not fidx.size:
continue
# Create new observations for this time period
nobs = obs(myobs[fidx[0]])
l = np.where(np.logical_or(nobs.time < t[0], nobs.time > t[1]))
nobs.delete(l)
for idx in fidx[1:]:
o = obs(myobs[idx])
l = np.where(np.logical_and(o.time >= t[0], o.time <= t[1]))
nobs.add(o[l])
# Remove any limits
if limits is not None:
l = np.where(np.logical_or.reduce((
nobs.x < limits['west'],
nobs.x > limits['east'],
nobs.y < limits['south'],
nobs.y > limits['north'])))
nobs.delete(l)
# Save out the new observations
nobs.to_netcdf(outfile, dt=dt)
pass
def to_grid(src_file, dest_file, dest_grid=None, records=None, threads=2,
reftime=None, nx=0, ny=0, weight=10, vmap=None, pmap=None):
"""
Given an existing model file, create (if does not exit) a
new ROMS history file using the given ROMS destination grid and
interpolate the ROMS fields onto the new grid. If an existing destination
file is given, it is interpolated onto the specified.
Parameters
----------
src_file : string,
Filename of src file to interpolate from
dest_file : string,
Name of desination file to write to
dest_grid: (string or seapy.model.grid), optional:
Name or instance of output definition
records : numpy.ndarray, optional:
Record indices to interpolate
threads : int, optional:
number of processing threads
reftime: datetime, optional:
Reference time as the epoch for ROMS file
nx : float, optional:
decorrelation length-scale for OA (same units as source data)
ny : float, optional:
decorrelation length-scale for OA (same units as source data)
weight : int, optional:
number of points to use in weighting matrix
vmap : dictionary, optional
mapping source and destination variables
pmap : numpy.ndarray, optional:
use the specified pmap rather than compute it
Returns
-------
pmap : ndarray
the weighting matrix computed during the interpolation
"""
src_grid = seapy.model.asgrid(src_file)
if dest_grid is not None:
destg = seapy.model.asgrid(dest_grid)
if not os.path.isfile(dest_file):
ncsrc = seapy.netcdf(src_file)
src_ref, time = seapy.roms.get_reftime(ncsrc)
if reftime is not None:
src_ref = reftime
records = np.arange(0, ncsrc.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
ncout = seapy.roms.ncgen.create_ini(dest_file,
eta_rho=destg.eta_rho,
xi_rho=destg.xi_rho,
s_rho=destg.n,
reftime=src_ref,
title="interpolated from " + src_file)
destg.to_netcdf(ncout)
ncout.variables["ocean_time"][:] = netCDF4.date2num(
netCDF4.num2date(ncsrc.variables[time][records],
ncsrc.variables[time].units),
ncout.variables["ocean_time"].units)
ncsrc.close()
if os.path.isfile(dest_file):
ncout = netCDF4.Dataset(dest_file, "a")
if dest_grid is None:
destg = seapy.model.asgrid(dest_file)
# Call the interpolation
try:
src_grid.set_east(destg.east())
pmap = __interp_grids(src_grid, destg, ncout, records=records,
threads=threads, nx=nx, ny=ny, weight=weight,
vmap=vmap, pmap=pmap)
except TimeoutError:
print("Timeout: process is hung, deleting output.")
# Delete the output file
os.remove(dest_file)
finally:
# Clean up
ncout.close()
return pmap
def gen_std_f(roms_file, std_file, records=None, fields=None):
"""
Create a std file for the given atmospheric forcing fields. This std
file can be used for the forcing constraint in 4D-Var. This requires a
long-term model spinup file from which to compute the standard deviation.
Parameters
----------
roms_file: string or list of strings,
The ROMS (history or average) file from which to compute the std. If
it is a list of strings, a netCDF4.MFDataset is opened instead.
std_file: string,
The name of the file to store the standard deviations fields
records: ndarray,
List of records to perform the std over. These records are used to
avoid the solar diurnal cycles in the fields.
fields: list of str,
The fields to compute std for. Default is to use the ROMS atmospheric
variables (sustr, svstr, shflux, ssflux).
Returns
-------
None
"""
# Create the fields to process
if fields is None:
fields = set(["sustr", "svstr", "shflux", "ssflux"])
# Open the ROMS info
grid = seapy.model.asgrid(roms_file)
nc = seapy.netcdf(roms_file)
# Filter the fields for the ones in the ROMS file
fields = set(nc.variables).intersection(fields)
# Build the output file
time_var = seapy.roms.get_timevar(nc)
epoch = netCDF4.num2date(0, nc.variables[time_var].units)
time = nc.variables[time_var][:]
ncout = seapy.roms.ncgen.create_da_frc_std(std_file,
eta_rho=grid.ln, xi_rho=grid.lm, s_rho=grid.n,
reftime=epoch, title="std from " + str(roms_file))
grid.to_netcdf(ncout)
# Set the records
if records is None:
records = np.arange(len(time))
else:
records = np.atleast_1d(records)
records = records[records <= len(time)]
# If there are any fields that are not part of the standard, add them
# to the output file
for f in fields.difference(ncout.variables):
ncout.createVariable(f, np.float32,
('ocean_time', "eta_rho", "xi_rho"))
# Loop over the time with the variance window:
ncout.variables[time_var][:] = np.mean(time[records])
for v in fields:
dat = nc.variables[v][records, :].std(axis=0)
ncout.variables[v][0, :] = dat
ncout.sync()
ncout.close()
nc.close()
def to_clim(src_file, dest_file, src_grid=None, dest_grid=None,
records=None, clobber=False, cdl=None, threads=2, reftime=None,
nx=0, ny=0, weight=10, vmap=None, pmap=None):
"""
Given an model output file, create (if does not exit) a
new ROMS climatology file using the given ROMS destination grid and
interpolate the ROMS fields onto the new grid. If an existing destination
file is given, it is interpolated onto the specified.
Parameters
----------
src_file : string,
Filename of src file to interpolate from
dest_file : string,
Name of desination file to write to
src_grid : (string or seapy.model.grid), optional:
Name or instance of source grid. If nothing is specified,
derives grid from the roms_file
dest_grid: (string or seapy.model.grid), optional:
Name or instance of output definition
records : numpy.ndarray, optional:
Record indices to interpolate
clobber: bool, optional
If True, clobber any existing files and recreate. If False, use
the existing file definition
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
threads : int, optional:
number of processing threads
reftime: datetime, optional:
Reference time as the epoch for climatology file
nx : float, optional:
decorrelation length-scale for OA (same units as source data)
ny : float, optional:
decorrelation length-scale for OA (same units as source data)
weight : int, optional:
number of points to use in weighting matrix
vmap : dictionary, optional
mapping source and destination variables
pmap : numpy.ndarray, optional:
use the specified pmap rather than compute it
Returns
-------
pmap : ndarray
the weighting matrix computed during the interpolation
"""
if dest_grid is not None:
destg = seapy.model.asgrid(dest_grid)
if src_grid is None:
src_grid = seapy.model.asgrid(src_file)
else:
src_grid = seapy.model.asgrid(src_grid)
ncsrc = seapy.netcdf(src_file)
src_ref, time = seapy.roms.get_reftime(ncsrc)
if reftime is not None:
src_ref = reftime
records = np.arange(0, ncsrc.variables[time].shape[0]) \
if records is None else np.atleast_1d(records)
ncout = seapy.roms.ncgen.create_clim(dest_file,
eta_rho=destg.ln,
xi_rho=destg.lm,
s_rho=destg.n,
reftime=src_ref,
clobber=clobber,
cdl=cdl,
title="interpolated from " + src_file)
src_time = seapy.roms.num2date(ncsrc, time, records)
ncout.variables["clim_time"][:] = seapy.roms.date2num(
src_time, ncout, "clim_time")
else:
raise AttributeError(
"you must supply a destination file or a grid to make the file")
# Call the interpolation
try:
src_grid.set_east(destg.east())
pmap = __interp_grids(src_grid, destg, ncsrc, ncout, records=records, threads=threads,
nx=nx, ny=ny, vmap=vmap, weight=weight, pmap=pmap)
except TimeoutError:
print("Timeout: process is hung, deleting output.")
# Delete the output file
os.remove(dest_file)
finally:
# Clean up
ncsrc.close()
ncout.close()
return pmap
def gen_std_i(roms_file, std_file, std_window=5, pad=1, skip=30, fields=None):
"""
Create a std file for the given ocean fields. This std file can be used
for initial conditions constraint in 4D-Var. This requires a long-term
model spinup file from which to compute the standard deviation.
Parameters
----------
roms_file: string or list of strings,
The ROMS (history or average) file from which to compute the std. If
it is a list of strings, a netCDF4.MFDataset is opened instead.
std_file: string,
The name of the file to store the standard deviations fields
std_window: int,
The size of the window (in number of records) to compute the std over
pad: int,
How much to pad each side of the window for overlap. For example,
std_window=10 and pad=2 would give a total window of 14 with 2 records
used in the prior window and 2 in the post window as well.
skip: int,
How many records to skip at the beginning of the file
fields: list of str,
The fields to compute std for. Default is to use the ROMS prognostic
variables.
Returns
-------
None
"""
# Create the fields to process
if fields is None:
fields = set(seapy.roms.fields)
# Open the ROMS info
grid = seapy.model.asgrid(roms_file)
nc = seapy.netcdf(roms_file)
# Filter the fields for the ones in the ROMS file
fields = set(nc.variables).intersection(fields)
# Build the output file
epoch, time_var = seapy.roms.get_reftime(nc)
time = nc.variables[time_var][:]
ncout = seapy.roms.ncgen.create_da_ini_std(std_file,
eta_rho=grid.ln,
xi_rho=grid.lm,
s_rho=grid.n,
reftime=epoch,
title="std from " +
str(roms_file))
grid.to_netcdf(ncout)
# If there are any fields that are not in the standard output file,
# add them to the output file
for f in fields.difference(ncout.variables):
ncout.createVariable(f, np.float32,
('ocean_time', "s_rho", "eta_rho", "xi_rho"))
# Loop over the time with the variance window:
for n, t in enumerate(
seapy.progressbar.progress(
np.arange(skip + pad,
len(time) - std_window - pad, std_window))):
idx = np.arange(t - pad, t + std_window + pad)
ncout.variables[time_var][n] = np.mean(time[idx])
for v in fields:
dat = nc.variables[v][idx, :].std(axis=0)
dat[dat > 10] = 0.0
ncout.variables[v][n, :] = dat
ncout.sync()
ncout.close()
nc.close()
def _initfile(self):
"""
Using an input file, try to load as much information
as can be found in the given file.
Parameters
----------
None
Returns
-------
None : sets attributes in grid
"""
# Define a dictionary to go through and convert netcdf variables
# to internal class attributes
gvars = {
"lat_rho": ["lat_rho", "lat", "latitude", "y_rho", "geolat_t"],
"lon_rho": ["lon_rho", "lon", "longitude", "x_rho", "geolon_t"],
"lat_u": ["lat_u", "y_u", "geolat_u"],
"lon_u": ["lon_u", "x_u", "geolon_u"],
"lat_v": ["lat_v", "y_v", "geolat_u"],
"lon_v": ["lon_v", "x_v", "geolon_u"],
"mask_rho": ["mask_rho", "mask"],
"mask_u": ["mask_u"],
"mask_v": ["mask_v"],
"angle": ["angle"],
"h": ["h"],
"n": ["n"],
"theta_s": ["theta_s"],
"theta_b": ["theta_b"],
"tcline": ["tcline"],
"hc": ["hc"],
"vtransform": ["vtransform"],
"vstretching": ["vstretching"],
"s_rho": ["s_rho"],
"cs_r": ["cs_r"],
"f": ["f"],
"pm": ["pm"],
"pn": ["pn"],
"z": ["z", "depth", "lev", "st_ocean"],
"wtype_grid": ["mask_rho"],
"rdrag": ["rdrag"],
"rdrag2": ["rdrag2"],
"diff_factor": ["diff_factor"],
"visc_factor": ["visc_factor"]
}
# Open the file
close = False
if self._nc is None:
close = True
self._nc = seapy.netcdf(self.filename)
try:
self.name = re.search("[^\.]*",
os.path.basename(self.filename)).group()
except:
self.name = "untitled"
self.key = {}
ncvars = {v.lower(): v for v in self._nc.variables.keys()}
for var in gvars:
for inp in gvars[var]:
if inp in ncvars:
self.key[var] = inp
self.__dict__[var] = self._nc.variables[ncvars[inp]][:]
break
if close:
# Close the file
self._nc.close()
self._nc = None
def gen_std_f(roms_file, std_file, records=None, fields=None):
"""
Create a std file for the given atmospheric forcing fields. This std
file can be used for the forcing constraint in 4D-Var. This requires a
long-term model spinup file from which to compute the standard deviation.
Parameters
----------
roms_file: string or list of strings,
The ROMS (history or average) file from which to compute the std. If
it is a list of strings, a netCDF4.MFDataset is opened instead.
std_file: string,
The name of the file to store the standard deviations fields
records: ndarray,
List of records to perform the std over. These records are used to
avoid the solar diurnal cycles in the fields.
fields: list of str,
The fields to compute std for. Default is to use the ROMS atmospheric
variables (sustr, svstr, shflux, ssflux).
Returns
-------
None
"""
# Create the fields to process
if fields is None:
fields = set(["sustr", "svstr", "shflux", "ssflux"])
# Open the ROMS info
grid = seapy.model.asgrid(roms_file)
nc = seapy.netcdf(roms_file)
# Filter the fields for the ones in the ROMS file
fields = set(nc.variables).intersection(fields)
# Build the output file
epoch, time_var = seapy.roms.get_reftime(nc)
time = nc.variables[time_var][:]
ncout = seapy.roms.ncgen.create_da_frc_std(std_file,
eta_rho=grid.ln,
xi_rho=grid.lm,
s_rho=grid.n,
reftime=epoch,
title="std from " +
str(roms_file))
grid.to_netcdf(ncout)
# Set the records
if records is None:
records = np.arange(len(time))
else:
records = np.atleast_1d(records)
records = records[records <= len(time)]
# If there are any fields that are not part of the standard, add them
# to the output file
for f in fields.difference(ncout.variables):
ncout.createVariable(f, np.float32,
('ocean_time', "eta_rho", "xi_rho"))
# Loop over the time with the variance window:
ncout.variables[time_var][:] = np.mean(time[records])
for v in fields:
dat = nc.variables[v][records, :].std(axis=0)
ncout.variables[v][0, :] = dat
ncout.sync()
ncout.close()
nc.close()
def gen_direct_forcing(his_file, frc_file, cdl=None):
"""
Generate a direct forcing file from a history (or other ROMS output) file. It requires
that sustr, svstr, shflux, and ssflux (or swflux) with salt be available. This will
generate a forcing file that contains: sustr, svstr, swflux, and ssflux.
Parameters
----------
his_file: string,
The ROMS history (or other) file(s) (can use wildcards) that contains the fields to
make forcing from
frc_file: string,
The output forcing file
cdl: string, optional,
Use the specified CDL file as the definition for the new
netCDF file.
Returns
-------
None: Generates an output file of bulk forcings
"""
import os
infile = seapy.netcdf(his_file)
ref, _ = seapy.roms.get_reftime(infile)
# Create the output file
nc = seapy.roms.ncgen.create_frc_direct(frc_file,
eta_rho=infile.dimensions[
'eta_rho'].size,
xi_rho=infile.dimensions[
'xi_rho'].size,
reftime=ref,
clobber=True,
title="Forcing from " +
os.path.basename(his_file),
cdl=cdl)
# Copy the data over
time = seapy.roms.num2date(infile, 'ocean_time')
nc.variables['frc_time'][:] = seapy.roms.date2num(time, nc, 'frc_time')
for x in seapy.progressbar.progress(seapy.chunker(range(len(time)), 1000)):
nc.variables['SSS'][x, :, :] = seapy.convolve_mask(
infile.variables['salt'][x, -1, :, :], copy=False)
if 'EminusP' in infile.variables:
nc.variables['swflux'][x, :, :] = seapy.convolve_mask(
infile.variables['EminusP'][x, :, :], copy=False) * 86400
elif 'swflux' in infile.variables:
nc.variables['swflux'][x, :, :] = seapy.convolve_mask(
infile.variables['swflux'][x, :, :], copy=False)
else:
nc.variables['swflux'][x, :, :] = seapy.convolve_mask(
infile.variables['ssflux'][x, :, :]
/ nc.variables['SSS'][x, :, :], copy=False)
nc.sync()
for f in ("sustr", "svstr", "shflux", "swrad"):
if f in infile.variables:
nc.variables[f][x, :, :] = seapy.convolve_mask(
infile.variables[f][x, :, :], copy=False)
nc.sync()
for f in ("lat_rho", "lat_u", "lat_v", "lon_rho", "lon_u", "lon_v"):
if f in infile.variables:
nc.variables[f][:] = infile.variables[f][:]
nc.close()
