get_domain.py 1.8 KB
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import glob
import datetime
import xarray as xr
import os
from pycif.utils.classes.setup import Setup


def get_domain(ref_dir, ref_file, input_dates, target_dir, tracer=None):

    # Looking for a reference file to read lon/lat in
    list_file = glob.glob('{}/*nc'.format(ref_dir))

    domain_file = None
    # Either a file is specified in the Yaml
    if ref_file in list_file:
        domain_file = '{}/{}'.format(ref_dir, ref_file)

    # Or loop over available file regarding file pattern
    else:
        for flx_file in list_file:
            try:
                date = \
                    datetime.datetime.strptime(os.path.basename(flx_file),
                                               ref_file)
                domain_file = flx_file
                break
            except ValueError:
                continue

    if domain_file is None:
        raise Exception(
            "EDGARv5 domain could not be initialized as no file was found")

    # Read lon/lat in
    nc = xr.open_dataset(domain_file, decode_times=False)

    lon = nc['lon']
    lat = nc['lat']

    lon_min = lon.min() - (lon[1] - lon[0]) / 2
    lon_max = lon.max() + (lon[-1] - lon[-2]) / 2
    lat_min = lat.min() - (lat[1] - lat[0]) / 2
    lat_max = lat.max() + (lat[-1] - lat[-2]) / 2

    nlon = lon.size
    nlat = lat.size

    # Initializes domain
    setup = Setup.from_dict({'domain':
                                  {'plugin': {'name': 'dummy',
                                              'version': 'std',
                                              'type': 'domain'},
                                   'xmin': lon_min, 'xmax': lon_max,
                                   'ymin': lat_min, 'ymax': lat_max,
                                   'nlon': nlon, 'nlat': nlat}})

    Setup.load_setup(setup, level=1)

    return setup.domain