root_grp.XCENT = 10.
root_grp.YCENT = 52.
root_grp.XORIG = XORIG
root_grp.YORIG = YORIG
root_grp.XCELL = float(grd) * 1000 # Domain in km
root_grp.YCELL = float(grd) * 1000
root_grp.IUTM = np.int32(0) # ?
root_grp.CPROJ = np.int32(2) # ?
root_grp.ITZON = np.int32(0) # ?
root_grp.VAR_LIST = ' '.join(specs)
root_grp.NAME = "EMISSIONS"
root_grp.history = "Created " + dt.datetime.today().strftime(
"%d%m%Y")
root_grp.FILEDESC = "EMISSIONS"
root_grp.FTYPE = np.int32(1) # ? [IO-API file type = CUSTOM3]
root_grp.CDATE = np.int32(dt.datetime.today().strftime(
"%Y%j")) # [IO-API file creation date]
root_grp.CTIME = np.int32(dt.datetime.today().strftime(
"%k%M%S")) # [IO-API file creation time]
root_grp.WDATE = np.int32(dt.datetime.today().strftime(
"%Y%j")) # [IO-API file write date]
root_grp.WTIME = np.int32(dt.datetime.today().strftime(
"%k%M%S")) # [IO-API file write time]
root_grp.GDTYP = np.int32(2) # ? [IO-API map projection]
root_grp.NTHIK = np.int32(1)
root_grp.VGTYP = np.int32(
6) # ? [IO-API grid type = H: m above ground]
root_grp.VGTOP = 10000. # ? [IO-API grid top for sigma coordinates]
root_grp.VGLVLS = np.int32(0) # ? [IO-API levels from 0 to NLAYS]
root_grp.GDNAM = " "
root_grp.UPNAM = " "
root_grp.UPDSC = " "
def _create_netcdf(self, out_path, jdate):
''' Creates a blank CMAQ-ready NetCDF file, including all the important
boilerplate and header information. But does not fill in any emissions data.
'''
# define some header variables
current_date = int(time.strftime("%Y%j"))
current_time = int(time.strftime("%H%M%S"))
# create and outline NetCDF file
rootgrp = Dataset(out_path, 'w', format='NETCDF4_CLASSIC')
_ = rootgrp.createDimension('TSTEP', None)
_ = rootgrp.createDimension('DATE-TIME', 2)
_ = rootgrp.createDimension('LAY', 1)
_ = rootgrp.createDimension('VAR', self.num_species) # number of variables/species
_ = rootgrp.createDimension('ROW', self.nrows) # Domain: number of rows
_ = rootgrp.createDimension('COL', self.ncols) # Domain: number of columns
# define TFLAG Variable
TFLAG = rootgrp.createVariable('TFLAG', 'i4', ('TSTEP', 'VAR', 'DATE-TIME',), zlib=True)
TFLAG.units = '<YYYYDDD,HHMMSS>'
TFLAG.long_name = 'TFLAG'
TFLAG.var_desc = 'Timestep-valid flags: (1) YYYYDDD or (2) HHMMSS'
# define variables and attribute definitions
varl = ''
for spec in self.species:
units = self.units[spec]
rootgrp.createVariable(spec, 'f4', ('TSTEP', 'LAY', 'ROW', 'COL'), zlib=True)
rootgrp.variables[spec].long_name = spec
rootgrp.variables[spec].units = units
rootgrp.variables[spec].var_desc = 'emissions'
varl += spec.ljust(16)
# global attributes
rootgrp.IOAPI_VERSION = self.header['IOAPI_VERSION']
rootgrp.EXEC_ID = self.header['EXEC_ID']
rootgrp.FTYPE = self.header['FTYPE'] # file type ID
rootgrp.CDATE = current_date # current date e.g. 2013137
rootgrp.CTIME = current_time # current time e.g. 50126
rootgrp.WDATE = current_date # current date e.g. 2013137
rootgrp.WTIME = current_time # current time e.g. 50126
rootgrp.SDATE = jdate # scenario date e.g. 2010091
rootgrp.STIME = self.header['STIME'] # start time e.g. 80000 (for GMT)
rootgrp.TSTEP = self.header['TSTEP'] # time step e.g. 10000 (1 hour)
rootgrp.NTHIK = self.header['NTHIK'] # Domain: perimeter thickness (boundary files only)
rootgrp.NCOLS = self.header['NCOLS'] # Domain: number of columns in modeling domain
rootgrp.NROWS = self.header['NROWS'] # Domain: number of rows in modeling domain
rootgrp.NLAYS = self.header['NLAYS'] # Domain: number of vertical layers
rootgrp.NVARS = self.num_species # number of variables/species
rootgrp.GDTYP = self.header['GDTYP'] # Domain: grid type ID (lat-lon, UTM, RADM, etc...)
rootgrp.P_ALP = self.header['P_ALP'] # Projection: alpha
rootgrp.P_BET = self.header['P_BET'] # Projection: betha
rootgrp.P_GAM = self.header['P_GAM'] # Projection: gamma
rootgrp.XCENT = self.header['XCENT'] # Projection: x centroid longitude
rootgrp.YCENT = self.header['YCENT'] # Projection: y centroid latitude
rootgrp.XORIG = self.header['XORIG'] # Domain: -684000 for CA_4k, -84000 for SC_4k
rootgrp.YORIG = self.header['YORIG'] # Domain: -564000 for CA_4k, -552000 for SC_4k
rootgrp.XCELL = self.header['XCELL'] # Domain: x cell width in meters
rootgrp.YCELL = self.header['YCELL'] # Domain: y cell width in meters
rootgrp.VGTYP = self.header['VGTYP'] # Domain: grid type ID (lat-lon, UTM, RADM, etc...)
rootgrp.VGTOP = self.header['VGTOP'] # Domain: Top Vertical layer at 10km
rootgrp.VGLVLS = self.header['VGLVLS'] # Domain: Vertical layer locations
rootgrp.GDNAM = self.header['GDNAM']
rootgrp.UPNAM = self.header['UPNAM']
rootgrp.FILEDESC = self.header['FILEDESC']
rootgrp.HISTORY = self.header['HISTORY']
rootgrp.setncattr('VAR-LIST', varl) # use this b/c the library does not like hyphens
# seconds since epoch
secs = time.mktime(time.strptime("%s 12" % jdate, "%Y%j %H"))
gmt_shift = time.strftime("%H", time.gmtime(secs))
secs -= (int(gmt_shift) - 8) * 3600
# build TFLAG variable
tflag = np.ones((25, self.num_species, 2), dtype=np.int32)
for hr in xrange(25):
gdh = time.strftime("%Y%j %H0000", time.gmtime(secs + hr * 3600))
a_date, ghr = map(int, gdh.split())
tflag[hr,:,0] = tflag[hr,:,0] * a_date
tflag[hr,:,1] = tflag[hr,:,1] * ghr
rootgrp.variables['TFLAG'][:] = tflag
return rootgrp, gmt_shift