def _set_default_time_encoding(encoding, dataset):
"""Set default time encoding.
Make sure time coordinates and bounds have the same units. Default is xarray's CF datetime
encoding, which can be overridden by user-defined encoding.
"""
if 'time' in dataset:
try:
dtnp64 = dataset['time'].data[0]
except IndexError:
dtnp64 = dataset['time'].data
default = CFDatetimeCoder().encode(xr.DataArray(dtnp64))
time_enc = {
'units': default.attrs['units'],
'calendar': default.attrs['calendar']
}
time_enc.update(encoding.get('time', {}))
bounds_enc = {
'units': time_enc['units'],
'calendar': time_enc['calendar'],
'_FillValue': None
}
encoding['time'] = time_enc
encoding[
'time_bnds'] = bounds_enc # FUTURE: Not required anymore with xarray-0.14+
def update_encoding(self, dataset, to_netcdf_kwargs):
"""Update encoding.
Avoid _FillValue attribute being added to coordinate variables (https://github.com/pydata/xarray/issues/1865).
"""
other_to_netcdf_kwargs = to_netcdf_kwargs.copy()
encoding = other_to_netcdf_kwargs.pop('encoding', {}).copy()
coord_vars = []
for data_array in dataset.values():
coord_vars.extend(set(data_array.dims).intersection(data_array.coords))
for coord_var in coord_vars:
encoding.setdefault(coord_var, {})
encoding[coord_var].update({'_FillValue': None})
# Make sure time coordinates and bounds have the same units. Default is xarray's CF datetime
# encoding, which can be overridden by user-defined encoding.
if 'time' in dataset:
try:
dtnp64 = dataset['time'].data[0]
except IndexError:
dtnp64 = dataset['time'].data
default = CFDatetimeCoder().encode(xr.DataArray(dtnp64))
time_enc = {'units': default.attrs['units'], 'calendar': default.attrs['calendar']}
time_enc.update(encoding.get('time', {}))
bounds_enc = {'units': time_enc['units'],
'calendar': time_enc['calendar'],
'_FillValue': None}
encoding['time'] = time_enc
encoding['time_bnds'] = bounds_enc # FUTURE: Not required anymore with xarray-0.14+
return encoding, other_to_netcdf_kwargs