2024-04-26

• Improve the performance of reading and accessing the data of PP and UM fields files (#746)
• Improve cf.Field.collapse performance by lazily computing reduced axis coordinates (#741)
• Improve cf.Field.__getitem__ performance by not re-calculating axis cyclicity (#744)
• Reduce output CFA netCDF file size by setting the HDF5 chunksizes of CFA variables to be no larger than required (#739)
• Allow a halo to be added by cf.Field.indices and cf.Field.subspace (#759)
• Added spherical regridding to discrete sampling geometry destination grids (#716)
• Added 3-d spherical regridding to cf.Field.regrids, and the option to regrid the vertical axis in logarithmic coordinates to cf.Field.regrids and cf.Field.regridc (#715)
• New keyword parameter to cf.Field.regrids and cf.Field.regridc: return_esmpy_regrid_operator (#766)
• New keyword parameters to cf.wi: open_lower and open_upper (#740)
• Fix misleading error message when it is not possible to create area weights requested from cf.Field.collapse (#731)
• Fix bug in cf.read when reading UM files that caused LBPROC value 131072 (Mean over an ensemble of parallel runs) to be ignored (#737)
• Fix bug in cf.aggregate that sometimes put a null transpose operation into the Dask graph when one was not needed (#754)
• Fix bug in cf.aggregate that caused a failure when property values were numpy arrays with two or more elements (#764)
• Fix bug in cf.aggregate that didn't correctly handle the "actual_range" CF attribute (#764)
• Fix bug whereby Field.cyclic is not updated after a Field.del_construct operation (#758)
• Fix bug that meant cyclic() always returned an empty set for domains produced by cf.Field.domain (#762)
• Changed dependency: cfunits>=3.3.7
• Changed dependency: netCDF4>=1.6.5

2024-03-01

• Allow DSG trajectories with identical trajectory_id values to be aggregated (#723)
• New methods: cf.Field.pad_missing and cf.Data.pad_missing (#717)
• Fix occasional bug when calculating UGRID cell areas when non-spatial coordinates span the discrete axis (#721)
• New keyword parameter to cf.Field.insert_dimension: constructs (#719)
• Added the cell_measures and coordinates keyword arguments to cf.Field.weights (#709)
• Added the cell_measures, coordinates, return_cell_measure, and methods keyword arguments to cf.Field.cell_area (#709)
• Allow cf.Data to be initialised with xarray.DataAarray (#706)
• Fix bug that caused cf.Field.del_file_location to fail when updating its metadata constructs (#707)
• Fix bug that caused incorrect data arrays in some cyclic subspaces created by cf.Field.subspace and cf.Field.__getitem__ (#713)
• Changed dependency: 1.11.1.0<=cfdm<1.11.2.0

2023-12-06

• Implemented the reading and manipulation of UGRID mesh topologies (#696)
• New methods: cf.Field.cell_connectivity, cf.Field.cell_connectivities (#696)
• New methods: cf.Field.domain_topology, cf.Field.domain_topologies (#696)
• New method: cf.Data.masked_values (#696)
• New method: cf.Data.arctan2 (#38)
• Fix bug that caused cf.Field.collapse to give incorrect results for the "sum", "sum_of_weights" and "sum_of_weights2" methods, only in the case that weights have been requested (#701)
• Changed dependency: 1.11.0.0<=cfdm<1.11.1.0
• New dependency: scipy>=1.10.0

2023-10-10

• Record dimension coordinate cell characteristics (#692)
• New set of methods to query, set, del, and get_cell_characteristics
• Fix bug in cf.Field.match_by_construct that always returned True for 1-d constructs whose axis is not in the data, even when the
  criterion was not matched (#691)
• Fix bug that prevented "https://" netCDF files from being read (#699)

2023-08-31

• Prevent unlimited dimensions from being written to CFA-netCDF files (#689)

2023-07-21

• Performance improvements to cf.Field.regrids and cf.Field.regridc (#675)
• Performance improvements to cf.read when reading datasets with compression-by-convention (#671)
• New keyword parameter to cf.Field.regrids and cf.Field.regridc: weights_file (#675)
• New keyword parameter to cf.aggregate: cells (#452)
• New function: cf.isclose (#661)
• Allow cf.Data and other objects that have data (such as cf.DimensionCoordinate) to be used as indices (#677)
• Fix bug that caused cf.Field.regrids and cf.Field.regridc to fail when the regrid axes are chunked with more than one chunk (#665)
• Fix bug that caused cf.read to fail for some PP data with a single vertical level (#667)
• Changed dependency: 1.10.1.1<=cfdm<1.10.2.0

2023-06-09

• New documentation cheat sheet (#591)
• Performance improvements to cf.aggregate (#640)
• New methods: cf.Data.argmin, cf.Field.argmin (#577)
• Deprecate cf.relative_vorticity in favour of cf.curl_xy (#643)
• Fix bug when using the -d option to the cfa script (#649)
• Fix the return tppe from cf.example_fields (#654)
• Fix set_data when the units are invalid (#646)
• Fix cf.Field.laplacian_xy, cf.Field.grad_xy, cf.curl_xy and cf.div_xy to work in cases when the dimension coordinates are missing standard names (#643)
• Changed dependency: cfunits>=3.3.6
• Changed dependency: cftime>=1.6.2

2023-04-27

• Re-introduction of CFA-netCDF functionality for CFA-0.6 (#451, #475, #637)
• New function: cf.CFA
• New method: cf.Data.get_cfa_write
• New method: cf.Data.set_cfa_write
• Fix excessive memory use arising from cf.Field.regrids and cf.Field.regridc (#623)
• Fixed bug in cf.Field.read when reading UM/PP data that are run-length encoded (#621)
• Fixed bug in cf.Field.compute_vertical_coordinates that retained incorrect bounds properties (#626)
• Removed benign UserWarning from cf.Field.percentile (#619)
• Handled the renaming of the ESMF Python interface from ESMF to esmpy at version 8.4.0. Both module names are accepted for now.
• Changed dependency: 1.10.1.0<=cfdm<1.10.2.0
• Changed (optional) dependency: 8.0.0<=esmpy
• Changed (optional) dependency: 1.10.0<=scipy

2023-03-10

• Python 3.7 support removed (#611)
• New method: cf.Field.del_properties (#598)
• New keyword parameter to cf.Data.concatenate: relaxed_units (#602)
• New keyword parameter to cf.unique_constructs: ignore_properties (#597)
• Allow cf.aggregate and to retain external cell measures (#605)
• Fixed bug in cf.Field.collapse that always retained invalid vertical coordinate reference systems (#599)
• Changed dependency: 1.10.0.3<=cfdm<1.10.1.0
• Changed dependency: cfunits>=3.3.5
• Changed dependency: 8.0.0<=ESMPYcfdm<8.2.0

2023-01-31

• Introduction of dask for all data manipulations, replacing the old LAMA methodology (e.g. #295, #428)
• Backwards incompatible API changes to facilitate the use of Dask (#579)
• New method: cf.Field.get_original_filenames (#448)
• New method: cf.Field.to_dask_array
• Fixed bug when reading UM stash codes that imply an area mean cell method (#487)
• New keyword parameter to cf.write: omit_data (#477)
• New keyword parameter to cf.read: chunks (#522)
• Extend functionality of cf.Data.roll and cf.Field.roll to allow multiple axes to be rolled simultaneously.
• Fixed bug that raised an exception when using the equal or exist keyword of cf.aggregate (#499)
• Fixed bug that created incorrect cyclic Voronoi bounds from DimensionCoordinate.create_bounds (#514)
• Changed dependency: 1.10.0.2<=cfdm<1.10.1.0
• New dependency: dask>=2022.12.1