def test_create_merged_weight_file_unstructured(self):
import ESMF
# Create an isomorphic source UGRID file.
ufile = self.get_temporary_file_path('ugrid.nc')
resolution = 10.
self.fixture_regular_ugrid_file(ufile, resolution, crs=Spherical())
src_grid = RequestDataset(ufile, driver=DriverNetcdfUGRID, grid_abstraction='point').get().grid
self.assertEqual(src_grid.abstraction, 'point')
# Create a logically rectangular destination grid file.
dst_grid = self.get_gridxy_global(resolution=20., crs=Spherical())
dst_path = self.get_temporary_file_path('dst.nc')
dst_grid.parent.write(dst_path)
# Create the grid chunks.
gs = GridChunker(src_grid, dst_grid, (3, 3), check_contains=False, src_grid_resolution=10.,
paths=self.fixture_paths, genweights=True)
gs.write_chunks()
# Merge weight files.
mwf = self.get_temporary_file_path('merged_weight_file.nc')
gs.create_merged_weight_file(mwf)
# Generate a global weight file using ESMF.
global_weights_filename = self.get_temporary_file_path('global_weights.nc')
srcgrid = ESMF.Mesh(filename=ufile, filetype=ESMF.FileFormat.UGRID, meshname=VariableName.UGRID_HOST_VARIABLE)
dstgrid = ESMF.Grid(filename=dst_path, filetype=ESMF.FileFormat.GRIDSPEC, add_corner_stagger=True)
srcfield = ESMF.Field(grid=srcgrid, meshloc=ESMF.MeshLoc.ELEMENT)
dstfield = ESMF.Field(grid=dstgrid)
_ = ESMF.Regrid(srcfield=srcfield, dstfield=dstfield, filename=global_weights_filename,
regrid_method=ESMF.RegridMethod.CONSERVE)
# Test merged and global weight files are equivalent.
self.assertWeightFilesEquivalent(global_weights_filename, mwf)
def test_system_grid_chunking(self):
if vm.size != 4:
raise SkipTest('vm.size != 4')
from ocgis.spatial.grid_chunker import GridChunker
path = self.path_esmf_unstruct
rd_dst = RequestDataset(uri=path,
driver=DriverESMFUnstruct,
crs=Spherical(),
grid_abstraction='point',
grid_is_isomorphic=True)
rd_src = deepcopy(rd_dst)
resolution = 0.28125
chunk_wd = os.path.join(self.current_dir_output, 'chunks')
if vm.rank == 0:
os.mkdir(chunk_wd)
vm.barrier()
paths = {'wd': chunk_wd}
gc = GridChunker(rd_src,
rd_dst,
nchunks_dst=[8],
src_grid_resolution=resolution,
dst_grid_resolution=resolution,
optimized_bbox_subset=True,
paths=paths,
genweights=True)
gc.write_chunks()
dist = OcgDist()
local_ctr = Dimension(name='ctr', size=8, dist=True)
dist.add_dimension(local_ctr)
dist.update_dimension_bounds()
for ctr in range(local_ctr.bounds_local[0], local_ctr.bounds_local[1]):
ctr += 1
s = os.path.join(chunk_wd, 'split_src_{}.nc'.format(ctr))
d = os.path.join(chunk_wd, 'split_dst_{}.nc'.format(ctr))
sf = Field.read(s, driver=DriverESMFUnstruct)
df = Field.read(d, driver=DriverESMFUnstruct)
self.assertGreater(sf.grid.shape[0], df.grid.shape[0])
wgt = os.path.join(chunk_wd, 'esmf_weights_{}.nc'.format(ctr))
f = Field.read(wgt)
S = f['S'].v()
self.assertAlmostEqual(S.min(), 1.0)
self.assertAlmostEqual(S.max(), 1.0)
with vm.scoped('merge weights', [0]):
if not vm.is_null:
merged_weights = self.get_temporary_file_path(
'merged_weights.nc')
gc.create_merged_weight_file(merged_weights, strict=False)
f = Field.read(merged_weights)
S = f['S'].v()
self.assertAlmostEqual(S.min(), 1.0)
self.assertAlmostEqual(S.max(), 1.0)
def test_create_merged_weight_file(self):
import ESMF
path_src = self.get_temporary_file_path('src.nc')
path_dst = self.get_temporary_file_path('dst.nc')
src_grid = create_gridxy_global(resolution=30.0,
wrapped=False,
crs=Spherical())
dst_grid = create_gridxy_global(resolution=35.0,
wrapped=False,
crs=Spherical())
src_grid.write(path_src)
dst_grid.write(path_dst)
# Split source and destination grids ---------------------------------------------------------------------------
gs = GridChunker(src_grid,
dst_grid, (2, 2),
check_contains=False,
allow_masked=True,
paths=self.fixture_paths,
genweights=True)
gs.write_chunks()
# Merge weight files -------------------------------------------------------------------------------------------
merged_weight_filename = self.get_temporary_file_path(
'merged_weights.nc')
gs.create_merged_weight_file(merged_weight_filename)
# Generate a global weight file using ESMF ---------------------------------------------------------------------
global_weights_filename = self.get_temporary_file_path(
'global_weights.nc')
srcgrid = ESMF.Grid(filename=path_src,
filetype=ESMF.FileFormat.GRIDSPEC,
add_corner_stagger=True)
dstgrid = ESMF.Grid(filename=path_dst,
filetype=ESMF.FileFormat.GRIDSPEC,
add_corner_stagger=True)
srcfield = ESMF.Field(grid=srcgrid)
dstfield = ESMF.Field(grid=dstgrid)
_ = ESMF.Regrid(srcfield=srcfield,
dstfield=dstfield,
filename=global_weights_filename,
regrid_method=ESMF.RegridMethod.CONSERVE)
# Test merged and global weight files are equivalent -----------------------------------------------------------
self.assertWeightFilesEquivalent(global_weights_filename,
merged_weight_filename)
def test_system_grid_chunking(self):
if vm.size != 4: raise SkipTest('vm.size != 4')
from ocgis.spatial.grid_chunker import GridChunker
path = self.path_esmf_unstruct
rd_dst = RequestDataset(uri=path,
driver=DriverESMFUnstruct,
crs=Spherical(),
grid_abstraction='point',
grid_is_isomorphic=True)
rd_src = deepcopy(rd_dst)
resolution = 0.28125
chunk_wd = os.path.join(self.current_dir_output, 'chunks')
if vm.rank == 0:
os.mkdir(chunk_wd)
vm.barrier()
paths = {'wd': chunk_wd}
gc = GridChunker(rd_src, rd_dst, nchunks_dst=[8], src_grid_resolution=resolution,
dst_grid_resolution=resolution,
optimized_bbox_subset=True, paths=paths, genweights=True)
gc.write_chunks()
dist = OcgDist()
local_ctr = Dimension(name='ctr', size=8, dist=True)
dist.add_dimension(local_ctr)
dist.update_dimension_bounds()
for ctr in range(local_ctr.bounds_local[0], local_ctr.bounds_local[1]):
ctr += 1
s = os.path.join(chunk_wd, 'split_src_{}.nc'.format(ctr))
d = os.path.join(chunk_wd, 'split_dst_{}.nc'.format(ctr))
sf = Field.read(s, driver=DriverESMFUnstruct)
df = Field.read(d, driver=DriverESMFUnstruct)
self.assertLessEqual(sf.grid.shape[0] - df.grid.shape[0], 150)
self.assertGreater(sf.grid.shape[0], df.grid.shape[0])
wgt = os.path.join(chunk_wd, 'esmf_weights_{}.nc'.format(ctr))
f = Field.read(wgt)
S = f['S'].v()
self.assertAlmostEqual(S.min(), 1.0)
self.assertAlmostEqual(S.max(), 1.0)
with vm.scoped('merge weights', [0]):
if not vm.is_null:
merged_weights = self.get_temporary_file_path('merged_weights.nc')
gc.create_merged_weight_file(merged_weights, strict=False)
f = Field.read(merged_weights)
S = f['S'].v()
self.assertAlmostEqual(S.min(), 1.0)
self.assertAlmostEqual(S.max(), 1.0)
def test_create_merged_weight_file_unstructured(self):
import ESMF
# Create an isomorphic source UGRID file.
ufile = self.get_temporary_file_path('ugrid.nc')
resolution = 10.
self.fixture_regular_ugrid_file(ufile, resolution, crs=Spherical())
src_grid = RequestDataset(ufile,
driver=DriverNetcdfUGRID,
grid_abstraction='point').get().grid
self.assertEqual(src_grid.abstraction, 'point')
# Create a logically rectangular destination grid file.
dst_grid = self.get_gridxy_global(resolution=20., crs=Spherical())
dst_path = self.get_temporary_file_path('dst.nc')
dst_grid.parent.write(dst_path)
# Create the grid chunks.
gs = GridChunker(src_grid,
dst_grid, (3, 3),
check_contains=False,
src_grid_resolution=10.,
paths=self.fixture_paths,
genweights=True)
gs.write_chunks()
# Merge weight files.
mwf = self.get_temporary_file_path('merged_weight_file.nc')
gs.create_merged_weight_file(mwf)
# Generate a global weight file using ESMF.
global_weights_filename = self.get_temporary_file_path(
'global_weights.nc')
srcgrid = ESMF.Mesh(filename=ufile,
filetype=ESMF.FileFormat.UGRID,
meshname=VariableName.UGRID_HOST_VARIABLE)
dstgrid = ESMF.Grid(filename=dst_path,
filetype=ESMF.FileFormat.GRIDSPEC,
add_corner_stagger=True)
srcfield = ESMF.Field(grid=srcgrid, meshloc=ESMF.MeshLoc.ELEMENT)
dstfield = ESMF.Field(grid=dstgrid)
_ = ESMF.Regrid(srcfield=srcfield,
dstfield=dstfield,
filename=global_weights_filename,
regrid_method=ESMF.RegridMethod.CONSERVE)
# Test merged and global weight files are equivalent.
self.assertWeightFilesEquivalent(global_weights_filename, mwf)
def test_create_merged_weight_file(self):
import ESMF
path_src = self.get_temporary_file_path('src.nc')
path_dst = self.get_temporary_file_path('dst.nc')
src_grid = create_gridxy_global(resolution=30.0, wrapped=False, crs=Spherical())
dst_grid = create_gridxy_global(resolution=35.0, wrapped=False, crs=Spherical())
src_grid.write(path_src)
dst_grid.write(path_dst)
# Split source and destination grids ---------------------------------------------------------------------------
gs = GridChunker(src_grid, dst_grid, (2, 2), check_contains=False, allow_masked=True, paths=self.fixture_paths,
genweights=True)
gs.write_chunks()
# Merge weight files -------------------------------------------------------------------------------------------
merged_weight_filename = self.get_temporary_file_path('merged_weights.nc')
gs.create_merged_weight_file(merged_weight_filename)
# Generate a global weight file using ESMF ---------------------------------------------------------------------
global_weights_filename = self.get_temporary_file_path('global_weights.nc')
srcgrid = ESMF.Grid(filename=path_src, filetype=ESMF.FileFormat.GRIDSPEC, add_corner_stagger=True)
dstgrid = ESMF.Grid(filename=path_dst, filetype=ESMF.FileFormat.GRIDSPEC, add_corner_stagger=True)
srcfield = ESMF.Field(grid=srcgrid)
dstfield = ESMF.Field(grid=dstgrid)
_ = ESMF.Regrid(srcfield=srcfield, dstfield=dstfield, filename=global_weights_filename,
regrid_method=ESMF.RegridMethod.CONSERVE)
# Test merged and global weight files are equivalent -----------------------------------------------------------
self.assertWeightFilesEquivalent(global_weights_filename, merged_weight_filename)
def chunked_rwg(source, destination, weight, nchunks_dst, merge, esmf_src_type,
esmf_dst_type, genweights, esmf_regrid_method, spatial_subset,
src_resolution, dst_resolution, buffer_distance, wd, persist,
eager, ignore_degenerate, data_variables, spatial_subset_path,
verbose, loglvl, weightfilemode):
# Used for creating the history string.
the_locals = locals()
if verbose:
ocgis_lh.configure(to_stream=True, level=getattr(logging, loglvl))
ocgis_lh(msg="Starting Chunked Regrid Weight Generation",
level=logging.INFO,
logger=CRWG_LOG)
if not ocgis.env.USE_NETCDF4_MPI:
msg = (
'env.USE_NETCDF4_MPI is False. Considerable performance gains are possible if this is True. Is '
'netCDF4-python built with parallel support?')
ocgis_lh(msg, level=logging.WARN, logger=CRWG_LOG, force=True)
if data_variables is not None:
data_variables = data_variables.split(',')
if nchunks_dst is not None:
# Format the chunking decomposition from its string representation.
if ',' in nchunks_dst:
nchunks_dst = nchunks_dst.split(',')
else:
nchunks_dst = [nchunks_dst]
nchunks_dst = tuple([int(ii) for ii in nchunks_dst])
if merge:
if not spatial_subset and weight is None:
raise ValueError('"weight" must be a valid path if --merge')
if spatial_subset and genweights and weight is None:
raise ValueError('"weight" must be a valid path if --genweights')
# Make a temporary working directory is one is not provided by the client. Only do this if we are writing subsets
# and it is not a merge only operation.
should_create_wd = (nchunks_dst is None
or not all([ii == 1
for ii in nchunks_dst])) or spatial_subset
if should_create_wd:
if wd is None:
if ocgis.vm.rank == 0:
wd = tempfile.mkdtemp(prefix='ocgis_chunked_rwg_')
wd = ocgis.vm.bcast(wd)
else:
exc = None
if ocgis.vm.rank == 0:
# The working directory must not exist to proceed.
if nchunks_dst is not None:
if os.path.exists(wd):
exc = ValueError(
"Working directory {} must not exist.".format(wd))
else:
# Make the working directory nesting as needed.
os.makedirs(wd)
exc = ocgis.vm.bcast(exc)
if exc is not None:
raise exc
if merge and not spatial_subset or (spatial_subset and genweights):
if _is_subdir_(wd, weight):
raise ValueError(
'Merge weight file path must not in the working directory. It may get unintentionally deleted with the --no_persist flag.'
)
# Create the source and destination request datasets.
rd_src = _create_request_dataset_(source,
esmf_src_type,
data_variables=data_variables)
rd_dst = _create_request_dataset_(destination, esmf_dst_type)
# Execute a spatial subset if requested.
paths = None
if spatial_subset:
if spatial_subset_path is None:
spatial_subset_path = os.path.join(wd, 'spatial_subset.nc')
msg = "Executing spatial subset. Output path is: {}".format(
spatial_subset_path)
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
_write_spatial_subset_(rd_src,
rd_dst,
spatial_subset_path,
src_resmax=src_resolution)
# Only split grids if a spatial subset is not requested.
else:
# Update the paths to use for the grid.
paths = {'wd': wd}
# Arguments to ESMF regridding.
esmf_kwargs = {
'regrid_method': esmf_regrid_method,
'ignore_degenerate': ignore_degenerate
}
# Create the chunked regridding object. This is used for both chunked regridding and a regrid with a spatial subset.
gs = GridChunker(rd_src,
rd_dst,
nchunks_dst=nchunks_dst,
src_grid_resolution=src_resolution,
paths=paths,
dst_grid_resolution=dst_resolution,
buffer_value=buffer_distance,
redistribute=True,
genweights=genweights,
esmf_kwargs=esmf_kwargs,
use_spatial_decomp='auto',
eager=eager)
# Write subsets and generate weights if requested in the grid splitter.
# TODO: Need a weight only option. If chunks are written, then weights are written...
if not spatial_subset and nchunks_dst is not None and not gs.is_one_chunk:
msg = "Starting main chunking loop..."
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
gs.write_chunks()
else:
if spatial_subset:
source = spatial_subset_path
if genweights:
msg = "Writing ESMF weights..."
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
handle_weight_file_check(weight)
gs.write_esmf_weights(source,
destination,
weight,
filemode=weightfilemode)
# Create the global weight file. This does not apply to spatial subsets because there will always be one weight
# file.
if merge and not spatial_subset and not gs.is_one_chunk:
# Weight file merge only works in serial.
exc = None
with ocgis.vm.scoped('weight file merge', [0]):
if not ocgis.vm.is_null:
msg = "Merging chunked weight files to global file. Output global weight file is: {}".format(
weight)
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
handle_weight_file_check(weight)
gs.create_merged_weight_file(weight)
excs = ocgis.vm.gather(exc)
excs = ocgis.vm.bcast(excs)
for exc in excs:
if exc is not None:
raise exc
ocgis.vm.barrier()
# Append the history string if there is an output weight file.
if weight and ocgis.vm.rank == 0:
if os.path.exists(weight):
# Add some additional stuff for record keeping
import getpass
import socket
import datetime
with nc.Dataset(weight, 'a') as ds:
ds.setncattr('created_by_user', getpass.getuser())
ds.setncattr('created_on_hostname', socket.getfqdn())
ds.setncattr('history', create_history_string(the_locals))
ocgis.vm.barrier()
# Remove the working directory unless the persist flag is provided.
if not persist:
if ocgis.vm.rank == 0:
msg = "Removing working directory since persist is False."
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
shutil.rmtree(wd)
ocgis.vm.barrier()
ocgis_lh(msg="Success!", level=logging.INFO, logger=CRWG_LOG)
return 0
def chunked_rwg(source, destination, weight, nchunks_dst, merge, esmf_src_type, esmf_dst_type, genweights,
esmf_regrid_method, spatial_subset, src_resolution, dst_resolution, buffer_distance, wd, persist,
eager, ignore_degenerate, data_variables, spatial_subset_path, verbose, loglvl):
if verbose:
ocgis_lh.configure(to_stream=True, level=getattr(logging, loglvl))
ocgis_lh(msg="Starting Chunked Regrid Weight Generation", level=logging.INFO, logger=CRWG_LOG)
if not ocgis.env.USE_NETCDF4_MPI:
msg = ('env.USE_NETCDF4_MPI is False. Considerable performance gains are possible if this is True. Is '
'netCDF4-python built with parallel support?')
ocgis_lh(msg, level=logging.WARN, logger=CRWG_LOG, force=True)
if data_variables is not None:
data_variables = data_variables.split(',')
if nchunks_dst is not None:
# Format the chunking decomposition from its string representation.
if ',' in nchunks_dst:
nchunks_dst = nchunks_dst.split(',')
else:
nchunks_dst = [nchunks_dst]
nchunks_dst = tuple([int(ii) for ii in nchunks_dst])
if merge:
if not spatial_subset and weight is None:
raise ValueError('"weight" must be a valid path if --merge')
if spatial_subset and genweights and weight is None:
raise ValueError('"weight" must be a valid path if --genweights')
# Make a temporary working directory is one is not provided by the client. Only do this if we are writing subsets
# and it is not a merge only operation.
if wd is None:
if ocgis.vm.rank == 0:
wd = tempfile.mkdtemp(prefix='ocgis_chunked_rwg_')
wd = ocgis.vm.bcast(wd)
else:
exc = None
if ocgis.vm.rank == 0:
# The working directory must not exist to proceed.
if os.path.exists(wd):
exc = ValueError("Working directory {} must not exist.".format(wd))
else:
# Make the working directory nesting as needed.
os.makedirs(wd)
exc = ocgis.vm.bcast(exc)
if exc is not None:
raise exc
if merge and not spatial_subset or (spatial_subset and genweights):
if _is_subdir_(wd, weight):
raise ValueError(
'Merge weight file path must not in the working directory. It may get unintentionally deleted with the --no_persist flag.')
# Create the source and destination request datasets.
rd_src = _create_request_dataset_(source, esmf_src_type, data_variables=data_variables)
rd_dst = _create_request_dataset_(destination, esmf_dst_type)
# Execute a spatial subset if requested.
paths = None
if spatial_subset:
if spatial_subset_path is None:
spatial_subset_path = os.path.join(wd, 'spatial_subset.nc')
msg = "Executing spatial subset. Output path is: {}".format(spatial_subset_path)
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
_write_spatial_subset_(rd_src, rd_dst, spatial_subset_path, src_resmax=src_resolution)
# Only split grids if a spatial subset is not requested.
else:
# Update the paths to use for the grid.
paths = {'wd': wd}
# Arguments to ESMF regridding.
esmf_kwargs = {'regrid_method': esmf_regrid_method,
'ignore_degenerate': ignore_degenerate}
# Create the chunked regridding object. This is used for both chunked regridding and a regrid with a spatial subset.
gs = GridChunker(rd_src, rd_dst, nchunks_dst=nchunks_dst, src_grid_resolution=src_resolution, paths=paths,
dst_grid_resolution=dst_resolution, buffer_value=buffer_distance, redistribute=True,
genweights=genweights, esmf_kwargs=esmf_kwargs, use_spatial_decomp='auto', eager=eager)
# Write subsets and generate weights if requested in the grid splitter.
# TODO: Need a weight only option. If chunks are written, then weights are written...
if not spatial_subset and nchunks_dst is not None:
msg = "Starting main chunking loop..."
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
gs.write_chunks()
else:
if spatial_subset:
source = spatial_subset_path
if genweights:
msg = "Writing ESMF weights..."
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
gs.write_esmf_weights(source, destination, weight)
# Create the global weight file. This does not apply to spatial subsets because there will always be one weight
# file.
if merge and not spatial_subset:
# Weight file merge only works in serial.
exc = None
with ocgis.vm.scoped('weight file merge', [0]):
if not ocgis.vm.is_null:
msg = "Merging chunked weight files to global file. Output global weight file is: {}".format(weight)
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
gs.create_merged_weight_file(weight)
excs = ocgis.vm.gather(exc)
excs = ocgis.vm.bcast(excs)
for exc in excs:
if exc is not None:
raise exc
ocgis.vm.barrier()
# Remove the working directory unless the persist flag is provided.
if not persist:
if ocgis.vm.rank == 0:
msg = "Removing working directory since persist is False."
ocgis_lh(msg=msg, level=logging.INFO, logger=CRWG_LOG)
shutil.rmtree(wd)
ocgis.vm.barrier()
ocgis_lh(msg="Success!", level=logging.INFO, logger=CRWG_LOG)
return 0
def chunked_rwg(source, destination, weight, nchunks_dst, merge, esmf_src_type, esmf_dst_type, genweights,
esmf_regrid_method, spatial_subset, src_resolution, dst_resolution, buffer_distance, wd, persist,
eager, ignore_degenerate):
if not ocgis.env.USE_NETCDF4_MPI:
msg = ('env.USE_NETCDF4_MPI is False. Considerable performance gains are possible if this is True. Is '
'netCDF4-python built with parallel support?')
ocgis_lh(msg, level=logging.WARN, logger='ocli.chunked_rwg', force=True)
if nchunks_dst is not None:
# Format the chunking decomposition from its string representation.
if ',' in nchunks_dst:
nchunks_dst = nchunks_dst.split(',')
else:
nchunks_dst = [nchunks_dst]
nchunks_dst = tuple([int(ii) for ii in nchunks_dst])
if merge:
if not spatial_subset and weight is None:
raise ValueError('"weight" must be a valid path if --merge')
if spatial_subset and genweights and weight is None:
raise ValueError('"weight" must be a valid path if --genweights')
# Make a temporary working directory is one is not provided by the client. Only do this if we are writing subsets
# and it is not a merge only operation.
if wd is None:
if ocgis.vm.rank == 0:
wd = tempfile.mkdtemp(prefix='ocgis_chunked_rwg_')
wd = ocgis.vm.bcast(wd)
else:
if ocgis.vm.rank == 0:
# The working directory must not exist to proceed.
if os.path.exists(wd):
raise ValueError("Working directory 'wd' must not exist.")
else:
# Make the working directory nesting as needed.
os.makedirs(wd)
ocgis.vm.barrier()
if merge and not spatial_subset or (spatial_subset and genweights):
if _is_subdir_(wd, weight):
raise ValueError(
'Merge weight file path must not in the working directory. It may get unintentionally deleted with the --no_persist flag.')
# Create the source and destination request datasets.
rd_src = _create_request_dataset_(source, esmf_src_type)
rd_dst = _create_request_dataset_(destination, esmf_dst_type)
# Execute a spatial subset if requested.
paths = None
if spatial_subset:
# TODO: This path should be customizable.
spatial_subset_path = os.path.join(wd, 'spatial_subset.nc')
_write_spatial_subset_(rd_src, rd_dst, spatial_subset_path)
# Only split grids if a spatial subset is not requested.
else:
# Update the paths to use for the grid.
paths = {'wd': wd}
# Arguments to ESMF regridding.
esmf_kwargs = {'regrid_method': esmf_regrid_method,
'ignore_degenerate': ignore_degenerate}
# Create the chunked regridding object. This is used for both chunked regridding and a regrid with a spatial subset.
gs = GridChunker(rd_src, rd_dst, nchunks_dst=nchunks_dst, src_grid_resolution=src_resolution, paths=paths,
dst_grid_resolution=dst_resolution, buffer_value=buffer_distance, redistribute=True,
genweights=genweights, esmf_kwargs=esmf_kwargs, use_spatial_decomp='auto', eager=eager)
# Write subsets and generate weights if requested in the grid splitter.
# TODO: Need a weight only option. If chunks are written, then weights are written...
if not spatial_subset and nchunks_dst is not None:
gs.write_chunks()
else:
if spatial_subset:
source = spatial_subset_path
if genweights:
gs.write_esmf_weights(source, destination, weight)
# Create the global weight file. This does not apply to spatial subsets because there will always be one weight
# file.
if merge and not spatial_subset:
# Weight file merge only works in serial.
exc = None
with ocgis.vm.scoped('weight file merge', [0]):
if not ocgis.vm.is_null:
gs.create_merged_weight_file(weight)
excs = ocgis.vm.gather(exc)
excs = ocgis.vm.bcast(excs)
for exc in excs:
if exc is not None:
raise exc
ocgis.vm.barrier()
# Remove the working directory unless the persist flag is provided.
if not persist:
if ocgis.vm.rank == 0:
shutil.rmtree(wd)
ocgis.vm.barrier()
return 0
def run_create_merged_weight_file(self, filemode):
import ESMF
esmf_filemode = getattr(ESMF.FileMode, filemode)
path_src = self.get_temporary_file_path('src.nc')
path_dst = self.get_temporary_file_path('dst.nc')
src_grid = create_gridxy_global(resolution=30.0,
wrapped=False,
crs=Spherical())
dst_grid = create_gridxy_global(resolution=35.0,
wrapped=False,
crs=Spherical())
src_grid.write(path_src)
dst_grid.write(path_dst)
# Split source and destination grids ---------------------------------------------------------------------------
src_rd = RequestDataset(path_src, driver='netcdf-cf')
dst_rd = RequestDataset(path_dst, driver='netcdf-cf')
gs = GridChunker(src_rd,
dst_rd, (2, 2),
check_contains=False,
allow_masked=True,
paths=self.fixture_paths,
genweights=True,
filemode=filemode)
gs.write_chunks()
if filemode == "WITHAUX":
weightfile = self.get_temporary_file_path('esmf_weights_1.nc')
vc = RequestDataset(weightfile, driver='netcdf').create_field()
self.assertGreater(len(vc.keys()), 3)
weightfile = self.get_temporary_file_path('esmf_weights_2.nc')
vc = RequestDataset(weightfile, driver='netcdf').get()
self.assertEqual(len(vc.keys()), 3)
# Merge weight files -------------------------------------------------------------------------------------------
merged_weight_filename = self.get_temporary_file_path(
'merged_weights.nc')
gs.create_merged_weight_file(merged_weight_filename)
nvars = len(
RequestDataset(merged_weight_filename,
driver='netcdf').get().keys())
if filemode == "WITHAUX":
self.assertGreater(nvars, 3)
else:
self.assertEqual(nvars, 3)
# Generate a global weight file using ESMF ---------------------------------------------------------------------
global_weights_filename = self.get_temporary_file_path(
'global_weights.nc')
srcgrid = ESMF.Grid(filename=path_src,
filetype=ESMF.FileFormat.GRIDSPEC,
add_corner_stagger=True)
dstgrid = ESMF.Grid(filename=path_dst,
filetype=ESMF.FileFormat.GRIDSPEC,
add_corner_stagger=True)
srcfield = ESMF.Field(grid=srcgrid)
dstfield = ESMF.Field(grid=dstgrid)
_ = ESMF.Regrid(srcfield=srcfield,
dstfield=dstfield,
filename=global_weights_filename,
regrid_method=ESMF.RegridMethod.CONSERVE,
filemode=esmf_filemode,
src_file=path_src,
dst_file=path_dst,
src_file_type=ESMF.FileFormat.GRIDSPEC,
dst_file_type=ESMF.FileFormat.GRIDSPEC)
# Test merged and global weight files are equivalent -----------------------------------------------------------
self.assertWeightFilesEquivalent(global_weights_filename,
merged_weight_filename)
def test_system_negative_values_in_spherical_grid(self):
original_dir = os.getcwd()
try:
xcn = np.arange(-10, 350, step=10, dtype=float)
xc = np.arange(0, 360, step=10, dtype=float)
yc = np.arange(-90, 100, step=10, dtype=float)
xvn = Variable("lon", xcn, dimensions=["lon"])
xv = Variable("lon", xc, dimensions=["lon"])
yv = Variable("lat", yc, dimensions=["lat"])
gridn = Grid(x=xvn.copy(), y=yv.copy(), crs=Spherical())
gridu = Grid(x=xv.copy(), y=yv.copy(), crs=Spherical())
gridw = create_gridxy_global(5, with_bounds=False, crs=Spherical())
grids = [gridn, gridu, gridw]
for ctr, (src, dst) in enumerate(itertools.product(grids, grids)):
os.chdir(self.current_dir_output)
gdirname = "grid-ctr-{}".format(ctr)
self.dprint(gdirname)
griddir = os.path.join(self.current_dir_output, gdirname)
os.mkdir(gdirname)
os.chdir(gdirname)
srcgridname = "gridn.nc"
src.parent.write(srcgridname)
dstgridname = "grid.nc"
dst.parent.write(dstgridname)
nchunks_dst = [(4, 1), (3, 1), (2, 1), (1, 1)]
for ctr, n in enumerate(nchunks_dst):
os.chdir(griddir)
dirname = 'ctr-{}'.format(ctr)
os.mkdir(dirname)
os.chdir(dirname)
wd = os.getcwd()
self.dprint("current chunks", n)
g = GridChunker(src,
dst,
nchunks_dst=n,
genweights=True,
paths={'wd': wd},
esmf_kwargs={'regrid_method': 'BILINEAR'})
if not g.is_one_chunk:
g.write_chunks()
g.create_merged_weight_file(
os.path.join(griddir, "ctr-{}".format(ctr),
"merged-weights.nc"))
else:
g.write_esmf_weights(
os.path.join(griddir, srcgridname),
os.path.join(griddir, dstgridname),
os.path.join(griddir, "global-weights.nc"))
os.chdir(griddir)
for ctr in range(0, len(nchunks_dst) - 1):
src_filename = os.path.join(griddir, "ctr-{}".format(ctr),
"merged-weights.nc")
dst_filename = os.path.join(griddir, "global-weights.nc")
self.assertWeightFilesEquivalent(src_filename,
dst_filename)
finally:
os.chdir(original_dir)
