A field containing the mask of the data array.
| Examples: |
|---|
>>> f
<CF Field: air_temperature(time(12), latitude(73), longitude(96)) K>
>>> m = f.mask
>>> m
<CF Field: long_name:air_temperature_mask(time(12), latitude(73), longitude(96)) >
>>> m.data
<CF Data: [[[True, ..., False]]] >