Cfdm

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**2022-08-17**

* New method: `cfdm.Field.auxiliary_coordinate`
* New method: `cfdm.Field.cell_measure`
* New method: `cfdm.Field.cell_method`
* New method: `cfdm.Field.coordinate`
* New method: `cfdm.Field.coordinate_reference`
* New method: `cfdm.Field.dimension_coordinate`
* New method: `cfdm.Field.domain_ancillary`
* New method: `cfdm.Field.domain_axis`
* New method: `cfdm.Field.field_ancillary`
* New method: `cfdm.Field.indices`
* New attribute: `cfdm.Field.array`
* New attribute: `cfdm.Field.datetime_array`
* New construct retrieval API methods
(https://github.com/NCAS-CMS/cfdm/issues/179)
* Implement (bar writing to netCDF files) lossy compression by
coordinate subsampling (https://github.com/NCAS-CMS/cfdm/issues/167)

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**2022-07-18**

* Upgrade to allow cfdm to work with Python 3.10
(https://github.com/NCAS-CMS/cfdm/issues/187)
* Fix bug that caused a hang when reading zero-length files
(https://github.com/NCAS-CMS/cfdm/issues/190)
* Fix bug to prevent error when writing vlen strings to a netCDF file
when compression has been set (for `netCDF4>=1.6.0`)
(https://github.com/NCAS-CMS/cfdm/issues/199)

---------------

**2022-03-10**

* Fixed bug that caused a failure from `cfdm.write` when writing
identical (auxiliary) coordinates to different data variables in
different groups (https://github.com/NCAS-CMS/cfdm/issues/177)
* Fixed bug that caused `cf.Domain.__str__` to fail when a dimension
coordinate construct does not have data
(https://github.com/NCAS-CMS/cfdm/issues/174)
* New dependency: ``packaging>=20.0``
* Changed dependency: ``cftime>=1.6.0``

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**2022-01-31**

* Fixed bug that caused a `cfdm.write` failure when a vertical
coordinate reference construct has no coordinates
(https://github.com/NCAS-CMS/cfdm/issues/164)
* Fixed bug that caused a failure when downstream `identities` methods
return an `itertools.chain` object
(https://github.com/NCAS-CMS/cfdm/issues/170)

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**2021-10-12**

* Fixed bug that prevented some geometry coordinates being written to
netCDF CLASSIC files (https://github.com/NCAS-CMS/cfdm/issues/140)
* Fixed bug that a caused segmentation fault when appending a string
data type to netCDF files
(https://github.com/NCAS-CMS/cfdm/issues/155)
* Fixed bug in `cf.Field.get_domain` when there are climatological
time axes (https://github.com/NCAS-CMS/cfdm/issues/159)

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**2021-09-21**

* Python 3.6 support removed
(https://github.com/NCAS-CMS/cfdm/issues/139)
* Conversion of `cfdm.Domain` to a non-abstract that may be read from
and written to a netCDF dataset
(https://github.com/NCAS-CMS/cfdm/issues/111)
* New method: `cfdm.Domain.creation_commands`
* New method: `cfdm.Domain.climatological_time_axes`
* New method: `cfdm.AuxiliaryCoordinate.del_climatology`
* New method: `cfdm.AuxiliaryCoordinate.get_climatology`
* New method: `cfdm.AuxiliaryCoordinate.is_climatology`
* New method: `cfdm.AuxiliaryCoordinate.set_climatology`
* New method: `cfdm.DimensionCoordinate.del_climatology`
* New method: `cfdm.DimensionCoordinate.get_climatology`
* New method: `cfdm.DimensionCoordinate.is_climatology`
* New method: `cfdm.DimensionCoordinate.set_climatology`
* New function: `cfdm.unique_constructs`
* New function: `cfdm.example_fields`
* Construct access API changes from 1.8.9.0 applied to `Field.convert`
* Improved error message for invalid inputs to `Field.convert`
* Raise exception when attempting to write multiply defined coordinate
reference parameters (https://github.com/NCAS-CMS/cfdm/issues/148)
* Interpret format specifiers for size 1 `cfdm.Data` arrays
(https://github.com/NCAS-CMS/cfdm/issues/152)
* Fix file name expansions in `cfdm.write`
(https://github.com/NCAS-CMS/cfdm/issues/157)

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