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Fix for netCDF4 1.4 behaviour change. #3177

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corinnebosley merged 1 commit into from
Sep 28, 2018
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Fix for netCDF4 1.4 behaviour change. #3177

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5 changes: 5 additions & 0 deletions lib/iris/fileformats/cf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -936,6 +936,11 @@ def __init__(self, filename, warn=False, monotonic=False):

self._dataset = netCDF4.Dataset(self._filename, mode='r')

# Return variable data as np.ma.MaskedArray *only* when masked points
# are found in the slice requested, otherwise as 'normal' np.ndarray.
# Note: this suits us better, and was standard up to netcdf 1.3.
self._dataset.set_always_mask(False)

# Issue load optimisation warning.
if warn and self._dataset.file_format in ['NETCDF3_CLASSIC', 'NETCDF3_64BIT']:
warnings.warn('Optimise CF-netCDF loading by converting data from NetCDF3 ' \
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