version 3.16.2

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

version 3.16.1

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

version 3.16.0

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

version 3.15.4

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)

version 3.15.3

2023-08-31

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

version 3.15.2

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

version 3.15.1

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 type 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

version 3.15.0

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

version 3.14.1

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<=ESMPY<8.2.0

version 3.14.0 (first Dask release)

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)
Removal of CFA-0.4 functionality (CFA-0.6 will introduced at a later version).
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

version 3.13.1 (last LAMA release)

2022-10-17

Upgrade to allow cf to work with Python 3.10 (#419)
Fixed bug when setting coordinate bounds with different units to their parent coordinates (#417)
Fixed bug that created incorrect hybrid height levels when reading UM fields that also have pseudolevels (#468)
Fixed bug when reading zero length netCDF or PP files caused cf-python to hang (#422)
Changed dependency: 1.9.0.4<=cfdm<1.9.1.0

version 3.13.0

2022-06-23

Fixed bug in cf.read when reading PP or fields files for which the um keyword has been set, but without the 'version' key (#306)
Fixed bug when setting the CFA "base" option to an empty string in cf.write (#346)
Fixed failure from cf.write when writing identical (auxiliary) coordinates to different data variables in different groups (#336)
Removed -g from the umread_lib/c-lib compiler options (#305)
Updated the deprecated distutils.version to packaging.version (#324)
Changed dependency: 1.9.0.3<=cfdm<1.9.1.0
New dependency: packaging>=20.0

version 3.12.0

2022-01-18

New method: cf.Field.grad_xy (#292)
New method: cf.Field.laplacian_xy (#292)
New function: cf.div_xy (#292)
New function: cf.curl_xy (#292)
Allow element-wise comparisons with None on cf.Data and cf.Field objects (#281)
Add missing closing parenthesis in cf.Query string representations (#279)
Fix cf.aggregate failures when using the dimension keyword parameter (#283)
Fix bug that raised error with subtraction of a cf.TimeDuration (#287)
Fix bug in cf.Field.derivative when wrapping with periodic coordinates (#289)
Changed dependency: 1.9.0.1<=cfdm<1.9.1.0
Changed dependency: cfunits>=3.3.4

version 3.11.0

2021-10-08

Python 3.6 support removed (#208)
Conversion of cf.Domain to a non-abstract that may be read from and written to a netCDF dataset (#220)
New method: cf.Domain.creation_commands
New method: cf.Domain.climatological_time_axes
New method: cf.AuxiliaryCoordinate.del_climatology
New method: cf.AuxiliaryCoordinate.get_climatology
New method: cf.AuxiliaryCoordinate.is_climatology
New method: cf.AuxiliaryCoordinate.set_climatology
New method: cf.DimensionCoordinate.del_climatology
New method: cf.DimensionCoordinate.get_climatology
New method: cf.DimensionCoordinate.is_climatology
New method: cf.DimensionCoordinate.set_climatology
New function: cf.unique_constructs
New function: cf.example_fields (#220)
New keyword parameter to `cf.read`: cdl_string (#171)
Improved verbose information output from cf.aggregate (#228)
Fix bug that causes a failure in cf.aggregate when otherwise aggregatable fields have non-valid units (#229)
Fix for cf.aggregate failures when a datum or coordinate conversion parameter has an array value (#230)
Allow for regridding using a destination field featuring size 1 dimension(s) (#250)
Fix bug that sometimes caused cf.Field.autocyclic to fail when setting a construct that is cyclic and has a defined period
Fix bug that sometimes caused a failure when reading PP extra data (#241)
Changed dependency: 1.9.0.0<=cfdm<1.9.1.0

version 3.10.0

2021-06-10

Improve performance by allowing a saved RegridOperator instance to define the regrid operator in cf.Field.regridc and cf.Field.regrids (#222)
Fix for incorrectly formatted logging.info statement sometimes causing a hang in cf.Field.collapse (#217)

version 3.9.0

2021-05-25

Construct access API changes (#201, #202, #203, #204)
Performance enhancements (#201, #202)
New write mode mode='a' for appending to, rather than over-writing, a netCDF file on disk (#30)
Temporarily removed the experimental ability to parallelise the collapse operation with MPI (#207)
Improved docstrings
Fix for unlimited dimensions read from a netCDF4 sub-group having zero size (NCAS-CMS/cfdm#113)
Fixes for changes in behaviour in cftime==1.4.0 (#184)
Better error message in the case of a numpy.ma.core.MaskError occurring upon reading of CDL files with only header or coordinate information (#197)
Changed dependency: 1.8.9.0<=cfdm<1.8.10.0
Changed dependency: cftime>=1.5.0
Changed dependency: cfunits>=3.3.3
Changed dependency: netCDF4>=1.5.4

version 3.8.0

2020-12-18

The setting of global constants can now be controlled by a context manager (#154)
Changed the behaviour of binary operations for constructs that have bounds (#146)
Changed the behaviour of unary operations for constructs that have bounds (#147)
New function: cf.bounds_combination_mode (#146)
New method: cf.Field.compute_vertical_coordinates (#142)
Fixed bug that prevented the verbosity from changing to any value specified as a verbose keyword parameter to cf.aggregate (only).
Fixed bug that caused a failure when writing a dataset that contains a scalar domain ancillary construct (#152)
Fixed bug that prevented aggregation of fields with external cell measures (#150 (comment))
Fixed bug that caused rows full of zeros to appear in WGDOS packed UM data that contain masked points (#161)
Changed dependency: 1.8.8.0<=cfdm<1.8.9.0
Changed dependency: cftime>=1.3.0
Changed dependency: cfunits>=3.3.1

version 3.7.0

2020-10-15

Python 3.5 support deprecated (3.5 was retired on 2020-09-13)
New method: cf.Field.del_domain_axis
New method: cf.Field._docstring_special_substitutions
New method: cf.Field._docstring_substitutions
New method: cf.Field._docstring_package_depth
New method: cf.Field._docstring_method_exclusions
New keyword parameter to `cf.Field.set_data`: inplace
New keyword parameter to `cf.write`: coordinates (#125)
New keyword parameter to `cf.aggregate`: ignore (#115)
Fixed bug that caused a failure when reading a dataset with incompatible bounds units. Now a warning is given (controllable by the logging level) and the offending bounds are returned as a separate field construct.
Fixed bug in cf.aggregate that caused it to error if either the equal_all or exist_all parameter were set to True.
Fixed bug in Data.percentile that caused it to error for non-singular ranks if the squeeze parameter was set to True.
cfa now prints error messages to the stderr stream rather than stdout.
Changed dependency: 1.8.7.0<=cfdm<1.8.8.0
Changed dependency: cfunits>=3.3.0

version 3.6.0

2020-07-24

Implemented the reading and writing of netCDF4 group hierarchies for CF-1.8 (#33)
New method: cf.Field.nc_variable_groups
New method: cf.Field.nc_set_variable_groups
New method: cf.Field.nc_clear_variable_groups
New method: cf.Field.nc_group_attributes
New method: cf.Field.nc_set_group_attribute
New method: cf.Field.nc_set_group_attributes
New method: cf.Field.nc_clear_group_attributes
New method: cf.Field.nc_geometry_variable_groups
New method: cf.Field.nc_set_geometry_variable_groups
New method: cf.Field.nc_clear_geometry_variable_groups
New method: cf.DomainAxis.nc_dimension_groups
New method: cf.DomainAxis.nc_set_dimension_groups
New method: cf.DomainAxis.nc_clear_dimension_groups
New keyword parameter to `cf.write`: group
Keyword parameter verbose to multiple methods now accepts named strings, not just the equivalent integer levels, to set verbosity.
New function: cf.configuration
Renamed to lower-case (but otherwise identical) names all functions which get and/or set global constants: cf.atol, cf.rtol, cf.log_level, cf.chunksize, cf.collapse_parallel_mode, cf.free_memory, cf.free_memory_factor, cf.fm_threshold, cf.of_fraction, cf.regrid_logging, cf.set_performance, cf.tempdir, cf.total_memory, cf.relaxed_identities. The upper-case names remain functional as aliases.
Changed dependency: cftime>=1.2.1
Changed dependency: 1.8.6.0<=cfdm<1.8.7.0
Changed dependency: cfunits>=3.2.9

version 3.5.1

2020-06-10

Changed dependency: 1.8.5<=cfdm<1.9.0
Fixed bug (emerging from the cfdm library) that prevented the reading of certain netCDF files, such as those with at least one external variable.

version 3.5.0

2020-06-09

Changed the API to `cf.Field.period`: Now sets and reports on the period of the field construct data, rather than that of its metadata constructs.
Enabled configuration of the extent and nature of informational and warning messages output by cf using a logging framework (see points below and also #37)
Changed behaviour and default of verbose keyword argument when available to a function/method so it interfaces with the new logging functionality.
Renamed and re-mapped all info keyword arguments available to any function/method to verbose, with equal granularity but a different numbering system: V = I + 1 maps info=I to verbose=V except for the debug case of I=3 mapping to V=-1 (V=0 disables).
New function cf.LOG_LEVEL to set the minimum log level for which messages are displayed globally, i.e. to change the project-wide verbosity.
New method: cf.Field.halo
New method: cf.Data.halo
New keyword parameter to `cf.Data.empty`: fill_value
Changed dependency: 1.8.4<=cfdm<1.9.0
Changed dependency: cfunits>=3.2.7
Changed dependency: cftime>=1.1.3
When assessing coordinate constructs for contiguousness with cf.Bounds.contiguous, allow periodic values that differ by the period to be considered the same (#75).
Fixed bug in cf.Field.regrids that caused a failure when regridding from latitude-longitude to tripolar domains (#73).
Fixed bug in cf.Field.regrids that caused a failure when regridding to tripolar domains the do not have dimension coordinate constructs (#73).
Fixed bug in cf.Field.regrids and cf.Field.regridc that caused a failure when applying the destination mask to the regridded fields (#73).
Fixed bug that caused cf.FieldList.select_by_ncvar to always fail (#76).
Fixed bug that stopped 'integral' collapses working for grouped collapses (#81).
Fixed bug that wouldn't allow the reading of a netCDF file which specifies Conventions other than CF (#78).

version 3.4.0

2020-04-30

New method: cf.Field.apply_masking
New method: cf.Data.apply_masking
New method: cf.Field.get_filenames (replaces deprecated cf.Field.files)
New method: cf.Data.get_filenames (replaces deprecated cf.Data.files)
New keyword parameter to `cf.read`: mask
New keyword parameter to `cf.read`: warn_valid (NCAS-CMS/cfdm#30)
New keyword parameter to `cf.write`: warn_valid (NCAS-CMS/cfdm#30)
New keyword parameter to `cf.Field.nc_global_attributes`: values
Added time coordinate bounds to the polygon geometry example field 6 returned by cf.example_field.
Changed dependency: cfdm==1.8.3
Changed dependency: cfunits>=3.2.6
Fixed bug in cf.write that caused (what are effectively) string-valued scalar auxiliary coordinates to not be written to disk as such, or even an exception to be raised.
Fixed bug in cf.write that caused the single and double keyword parameters to have no effect. This bug was introduced at version 3.0.0 (#65).
Fixed bug in cf.Field.has_construct that caused it to always return False unless a construct key was used as the construct identity (#67).

version 3.3.0

2020-04-20

Changed the API to `cf.Field.convolution_filter`: renamed the weights parameter to window.
Reinstated True as a permitted value of the weights keyword of cf.Field.collapse (which was deprecated at version 3.2.0).
New method: cf.Field.moving_window (#44)
New method: cf.Data.convolution_filter
New keyword parameter to `cf.Field.weights`: axes
New permitted values to coordinate keyword parameter of cf.Field.collapse and `cf.Field.cumsum`: 'minimum', 'maximum'
New keyword parameter to `cf.Data.cumsum`: inplace
Fixed bug that prevented omitted the geometry type when creating creation commands (#59).
Fixed bug that caused a failure when rolling a dimension coordinate construct without bounds.

version 3.2.0

2020-04-01

First release for CF-1.8 (does not include netCDF hierarchical groups functionality) (#33)
Deprecated True as a permitted value of the weights keyword of cf.Field.collapse.
New methods: cf.Data.compressed, cf.Data.diff
New function: cf.implementation
New methods completing coverage of the inverse trigonometric and hyperbolic operations: cf.Data.arccos, cf.Data.arccosh, cf.Data.arcsin, cf.Data.arctanh.
New keyword parameters to cf.Field.collapse, cf.Field.cell_area, `cf.Field.weights`: radius, great_circle.
Implemented simple geometries for CF-1.8.
Implemented string data-types for CF-1.8.
Changed dependency: cfdm>=1.8.0
Changed dependency: cfunits>=3.2.5
Changed dependency: netCDF4>=1.5.3
Changed dependency: cftime>=1.1.1
Renamed the regridding method, i.e. option for the method parameter to cf.Field.regridc and cf.Field.regrids, bilinear to linear, though bilinear is still supported (use of it gives a message as such).
Made documentation of available cf.Field.regridc and cf.Field.regrids method parameters clearer & documented second-order conservative method.
Fixed bug that prevented writing to 'NETCDF3_64BIT_OFFSET' and 'NETCDF3_64BIT_DATA' format files (NCAS-CMS/cfdm#9).
Fixed bug that prevented the select keyword of cf.read from working with PP and UM files (#40).
Fixed bug that prevented the reading of PP and UM files with "zero" data or validity times.
Fixed broken API reference 'source' links to code in cfdm.
Fixed bug in cf.Field.weights with the parameter methods set to True where it would always error before returning dictionary of methods.
Fixed bug in cf.Data.where that meant the units were not taken into account when the condition was a cf.Query object with specified units.
Addressed many 'TODO' placeholders in the documentation.

version 3.1.0

2020-01-17

Changed the API to cf.Field.match_by_construct and cf.FieldList.select_by_construct.
Changed the default value of the cf.Field.collapse group_span parameter to True and default value of the group_contiguous parameter to 1 (#28).
Changed the default values of the cf.Field.collapse group_by and coordinate parameters to None.
Changed the default value of the identity parameter to None for cf.Field.coordinate, cf.Field.dimension_coordinate, cf.Field.auxiliary_coordinate, cf.Field.field_ancillary, cf.Field.domain_ancillary, cf.Field.cell_method, cf.Field.cell_measure, cf.Field.coordinate_reference, cf.Field.domain_axis.
New keyword parameter to `cf.Field.weights`: data.
New keyword parameter to `cf.aggregate`: field_identity (#29).
New example field (5) available from cf.example_field.
New regridding option: 'conservative_2nd'.
Fixed bug that didn't change the units of bounds when the units of the coordinates were changed.
Fixed bug in cf.Field.domain_axis that caused an error when no unique domain axis construct could be identified.
Changed dependency:cfunits>=3.2.4. This fixes a bug that raised an exception for units specified by non-strings (NCAS-CMS/cfunits#1).
Changed dependency: ESMF>=to 8.0.0. This fixes an issue with second-order conservative regridding, which is now fully documented and available.
Converted all remaining instances of Python 2 print statements in the documentation API reference examples to Python 3.
Corrected aspects of the API documentation for trigonometric functions.
Fixed bug whereby cf.Data.arctan would not process bounds.
New methods for hyperbolic operations: cf.Data.sinh, cf.Data.cosh, cf.Data.tanh, cf.Data.arcsinh.

version 3.0.6

2019-11-27

New method: cf.Field.uncompress.
New method: cf.Data.uncompress.
New keyword parameter to `cf.environment`: paths.
Can now insert a size 1 data dimension for a new, previously non-existent domain axis with cf.Field.insert_dimension.
Changed the default value of the ignore_compression parameter to True.
Fixed bug that sometimes gave incorrect cell sizes from the cellsize attribute when used on multidimensional coordinates (#15).
Fixed bug that sometimes gave an error when the LHS and RHS operands are swapped in field construct arithmetic (#16).
Changed dependency: cfdm>=1.7.11

version 3.0.5

2019-11-14

New method: cf.Field.compress.
New function: cf.example_field
New keyword parameter to `cf.Data`: mask.
Deprecated method: cf.Field.example_field
Fixed bug that didn't allow cf.Field.cell_area to work with dimension coordinates with units equivalent to metres (#12)
Fixed bug that omitted bounds having their units changed by override_units and override calendar (#13).
Removed specific user shebang from cfa script (#14).
Changed dependency: cfdm>=1.7.10. This fixes a bug that didn't allow CDL files to start with comments or blank lines (NCAS-CMS/cfdm#5).
Changed dependency: cftime>=1.0.4.2

version 3.0.4

2019-11-08

New methods: cf.Field.percentile, cf.Field.example_field, cf.Field.creation_commands.
New field construct collapse methods: median, mean_of_upper_decile.
New method: cf.FieldList.select_field.
New methods: cf.Data.median, cf.Data.mean_of_upper_decile, cf.Data.percentile, cf.Data.filled, cf.Data.creation_commands.
New keyword parameter to `cf.Data`: dtype.
Changed default ddof back to 1 in cf.Data.var and cf.Data.sd (see version 3.0.3 and #8)
Fixed bug that sometimes caused an exception to be raised when metadata constructs were selected by a property value that legitimately contained a colon.
Changed dependency: cfdm>=1.7.9

version 3.0.3

2019-11-01

Fixed bug (introduced at v3.0.2) that caused mean_absolute_value collapses by cf.Field.collapse to be not weighted when they should be (#9)
Changed default ddof from 0 to 1 in cf.Data.var and cf.Data.sd (#8)

version 3.0.2

2019-10-31

Now reads CDL files (#1)
New methods: cf.Field.cumsum, cf.Field.digitize, cf.Field.bin, cf.Field.swapaxes, cf.Field.flatten, cf.Field.radius.
New function: cf.histogram.
New field construct collapse methods: integral, mean_absolute_value, maximum_absolute_value, minimum_absolute_value, sum_of_squares, root_mean_square.
New keyword parameters to cf.Field.collapse and `cf.Field.weights`: measure, scale, radius
New methods: cf.Data.cumsum, cf.Data.digitize, cf.Data.masked_all, cf.Data.mean_absolute_value, cf.Data.maximum_absolute_value, cf.Data.minimum_absolute_value, cf.Data.sum_of_squares, cf.Data.root_mean_square, cf.Data.flatten.
Renamed cf.default_fillvals to cf.default_netCDF_fillvals.
Changed dependency: cfdm>=1.7.8. This fixes a bug that sometimes occurs when writing to disk and the _FillValue and data have different data types.
Changed dependency: cfunits>=3.2.2
Changed dependency: cftime>=1.0.4.2
Fixed occasional failure to delete all temporary directories at exit.
Fixed bug in cf.Data.func when overriding units. Affects all methods that call cf.Data.func, such as cf.Data.tan and cf.Field.tan.
Fixed "relaxed units" behaviour in cf.aggregate and field construct arithmetic.
Fixed bug that led to incorrect persistent entries in output of cf.Field.properties.
Fixed bug in cf.Data.squeeze that sometimes created inconsistencies with the cyclic dimensions.
Fixed bug in cf.Field.mask that assigned incorrect units to the result.

version 3.0.1

2019-10-01

Updated description in setup.py

version 3.0.0 (first Python 3 release)

2019-10-01

Complete refactor for Python 3, including some API changes.

Scripts written for version 2.x but running under version 3.x should either work as expected, or provide informative error messages on the new API usage. However, it is advised that the outputs of older scripts be checked when running with Python 3 versions of the cf library.
Deprecated cfdump (its functionality is now included in cfa).

version 2.3.8 (last Python 2 release)

2019-10-07

In cf.write, can set single=False to mean double=True, and vice versa.
Fixed bug in cf.aggregate - removed overly strict test on dimension coordinate bounds.
Fixed bug in cf.read that set the climatology attribute to True when there are no bounds.
Fixed bug in cf.write when writing missing values (set_fill was off, now on)

version 2.3.5

2019-04-04

Changed calculation of chunksize in parallel case to avoid potential problems and introduced a new method cf.SET_PERFORMANCE to tune the chunksize and the fraction of memory to keep free.

version 2.3.4

2019-03-27

Fix bug in creating a during cell method during a field collapse.

version 2.3.3

2019-03-05

Allow failure to compile to go through with a warning, rather than failing to install. if this happens, reading a PP/UM file will result in "Exception: Can't determine format of file test2.pp"
Fixed bug in cf.Field.convolution_filter giving false error over units.

version 2.3.2

2018-12-10

cf.Field.regridc now compares the units of the source and destination grids and converts between them if possible or raises an error if they are not equivalent.

version 2.3.1

2018-11-07

Fixed bug in cf.Field.regridc that caused it to fail when regridding a multidimensional field along only one dimension.
Fixed bug which in which the default logarithm is base 10, rather than base e

version 2.3.0

2018-10-22

The collapse method can now be parallelised by running any cf-python script with mpirun if mpi4py is installed. This is an experimental feature and is not recommended for operational use. None of the parallel code is executed when a script is run in serial.

version 2.2.8

2018-08-28

Bug fix: better handle subspacing by multiple multidimensional items

version 2.2.7

2018-07-25

Bug fix: correctly set units of bounds when the cf.Data object inserted with insert_bounds has units of ''. In this case the bounds of the parent coordinate are now inherited.

version 2.2.6

2018-07-24

Improved error messages
Changed behaviour when printing reference times with a calendar of 'none' - no longer attempts a to create a date-time representation

version 2.2.5

2018-07-02

Fixed bug with HDF chunk sizes that prevented the writing of large files

version 2.2.4

2018-06-29

Interim fix for with HDF chunk sizes that prevented the writing of large files

version 2.2.3

2018-06-21

During writing, disallow the creation of netCDF variable names that contain characters other than letters, digits, and underscores.

version 2.2.3

2018-06-21

During writing, disallow the creation of netCDF variable names that contain characters other than letters, digits, and underscores.

version 2.2.2

2018-06-06

Fix for removing duplicated netCDF dimensions when writing data on (e.g.) tripolar grids.

version 2.2.1

2018-06-05

Fix for calculating are weights from projection coordinates

version 2.2.0

2018-06-04

Updated for netCDF4 v1.4 cftime API changes

version 2.1.9

2018-05-31

Allowed invalid units through. Can test with cf.Units.isvalid.

version 2.1.8

2018-03-08

Fixed bug when weights parameter is a string in cf.Field.collapse

version 2.1.7

2018-02-13

Fixed bug in cf.Field.collapse when doing climatological time collapse with only one period per year/day

version 2.1.6

2018-02-09

Fixed bug in Variable.mask

version 2.1.4

2018-02-09

Added override_calendar method to coordinates and domain ancillaries that changes the calendar of the bounds, too.
Fixed bug in cf.Data.where when the condition is a cf.Query object.
Fixed bug in cf.Variable.mask

version 2.1.3

2018-02-07

Allowed scipy and matplotlib imports to be optional

version 2.1.2

2017-11-28

Added group_span and contiguous_group options to cf.Field.collapse

version 2.1.1

2017-11-10

Disallowed raising offset units to a power (e.g. taking the square of data in units of K @ 273.15).
Removed len() of cf.Field (previously always, and misleadingly, returned 1)
Fixed setting of cell methods after climatological time collapses
Added printing of ncvar in cf.Field.__str__ and cf.Field.dump
Added user stash table option to cfa script

version 2.1

2017-10-30

Misc. bug fixes

version 2.0.6

2017-09-28

Removed error when cf.read finds no fields - an empty field list is now returned
New method cf.Field.count

version 2.0.5

2017-09-19

Bug fix when creating wrap-around subspaces from cyclic fields
Fix (partial?) for memory leak when reading UM PP and fields files

version 2.0.4

2017-09-15

submodel property for PP files
API change for `cf.Field.axis`: now returns a cf.DomainAxis object by default
Bug fix in cf.Field.where
Bug fix when initialising a field with the source parameter
Changed default output format to NETCDF4 (from NETCDF3_CLASSIC)

version 2.0.3

2017-08-01

version 2.0.1.post1

2017-07-12

Bug fix for reading DSG ragged arrays

version 2.0.1

2017-07-11

Updated cf.FieldList behaviour (with reduced methods)

version 2.0

2017-07-07

First release with full CF data model and full CF-1.6 compliance (including DSG)

version 1.5.4.post4

2017-07-07

Bug fixes to cf.Field.regridc

version 1.5.4.post1

2017-06-13

removed errant scikit import

version 1.5.4

2017-06-09

Tripolar regridding

version 1.5.3

2017-05-10

Updated STASH code to standard_name table (with thanks to Jeff Cole)
Fixed bug when comparing masked arrays for equality

version 1.5.2

2017-03-17

Fixed bug when accessing PP file whose format/endian/word-size has been specified

version 1.5.1

2017-03-14

Can specify 'pp' or 'PP' in um option to cf.read

version 1.5

2017-02-24

Changed weights in calculation of variance to reliability weights (from frequency weights). This not only scientifically better, but faster, too.

version 1.4

2017-02-22

Rounded datetime to time-since conversions to the nearest microsecond, to reflect the accuracy of netCDF4.netcdftime
Removed import tests from setup.py
New option --um to cfa, cfdump
New parameter um to cf.read

version 1.3.3

2017-01-31

Rounded datetime to time-since conversions to the nearest microsecond, to reflect the accuracy of netCDF4.netcdftime
Fix for netCDF4.__version__ > 1.2.4 do to with datetime.calendar handle with care

version 1.3.2

2016-09-21

Added --build-id to LDFLAGS in umread Makefile, for sake of RPM builds (otherwise fails when building debuginfo RPM). Pull request #16, thanks to Klaus Zimmermann.
Improved test handling. Pull request #21, thanks to Klaus Zimmermann.
Removed udunits2 database. This removes the modified version of the udunits2 database in order to avoid redundancies, possible version incompatibilities, and license questions. The modifications are instead carried out programmatically in units.py. Pull request #20, thanks to Klaus Zimmermann.

version 1.3.1

2016-09-09

New method: cf.Field.unlimited, and new 'unlimited' parameter to cf.write and cfa

version 1.3

2016-09-05

Removed asreftime, asdatetime and dtvarray methods
New method: convert_reference_time for converting reference time data values to have new units.

version 1.2.3

2016-08-23

Fixed bug in cf.Data.equals

version 1.2.2

2016-08-22

Fixed bug in binary operations to do with the setting of Partition.part
Added cf.TimeDuration functionality to get_bounds cellsizes parameter. Also new parameter flt ("fraction less than") to position the coordinate within the cell.

version 1.2

2016-07-05

Added HDF_chunks methods

version 1.1.11

2016-07-01

Added cellsize option to cf.Coordinate.get_bounds, and fixed bugs.
Added variable_attributes option to cf.write
Added cf.ENVIRONMENT method

version 1.1.10

2016-06-23

Added reference_datetime option to cf.write
Fixed bug in cf.um.read.read which incorrectly ordered vertical coordinates

version 1.1.9

2016-06-17

New methods cf.Variable.files and cf.Data.files, cf.Field.files which report which files are referenced by the data array.
Fix to stop partitions return numpy.bool_ instead of numpy.ndarray
Fix to determining cyclicity of regridded fields.
Functionality to recursively read directories in cf.read, cfa and cfump
Print warning but carry on when ESMF import fails
Fixed bug in cf.Field.subspace when accessing axes derived from UM format files

version 1.1.8

2016-05-18

Slightly changed the compression API to cf.write
Added compression support to the cfa command line script
Added functionality to change data type on writing to cf.write and cfa - both in general and for with extra convenience for the common case of double to single (and vice versa).
Removed annoying debug print statements from cf.um.read.read

version 1.1.7

2016-05-04

Added fix for change in numpy behaviour (numpy.number types do not support assignment)
Added capability to load in a user STASH to standard name table: cf.um.read.load_stash2standard_name

version 1.1.6

2016-04-27

Added --reference_datetime option to cfa
Bug fix to cf.Field.collapse when providing cf.Query objects via the group parameter
Added auto regridding method, which is now the default

version 1.1.5

2016-03-03

Bug fix in cf.Field.where when using cf.masked
conda installation (with thanks to Andy Heaps)
Bug fix for type casting in cf.Field.collapse
Display long_name if it exists and there is no standard_name
Fix for compiling the UM C code on certain OSs (with thanks to Simon Wilson)
Fixed incorrect assignment of cyclicity in cf.Field.regrids
Nearest neighbour regridding in cf.Field.regrids

version 1.1.4

2016-02-09

Bug fix to cf.Field.autocyclic
Bug fix to cf.Field.clip - now works when limit units are supplied
New methods: cf.Data.round, cf.Field.Round
Added lbtim as a cf.Field property when reading UM files
Fixed coordinate creation for UM atmosphere_hybrid_height_coordinate
Bug fix to handling of cyclic fields by cf.Field.regrids
Added nearest neighbour field regridding
Changed keyword ignore_dst_mask in cf.Field.regrids to use_dst_mask, which is false by default

version 1.1.3

2015-12-10

Bug fixes to cf.Field.collapse when the "group" parameter is used
Correct setting of cyclic axes on regridded fields
Updates to STASH_to_CF.txt table: 3209, 3210

version 1.1.2

2015-12-01

Updates to STASH_to_CF.txt table
Fixed bug in decoding UM version in cf.um.read.read
Fixed bug in cf.units.Utime.num2date
Fixed go-slow behaviour for silly BZX, BDX in PP and fields file lookup headers

version 1.1.1

2015-11-05

Fixed bug in decoding UM version in cf.read

version 1.1

2015-10-28

Fixed bug in cf.Units.conform
Changed cf.Field.__init__ so that it works with just a data object
Added cf.Field.regrids for lat-lon regridding using ESMF library
Removed support for netCDF4-python versions < 1.1.1
Fixed bug which made certain types of coordinate bounds non-contiguous after transpose
Fixed bug with i=True in cf.Field.where and in cf.Field.mask_invalid
cyclic methods now return a set, rather than a list
Fixed bug in _write_attributes which might have slowed down some writes to netCDF files.
Reduced annoying redirection in the documentation
Added cf.Field.field method and added top_level keyword to cf.read
Fixed bug in calculation of standard deviation and variance (the bug caused occasional crashes - no incorrect results were calculated)
In items method (and friends), removed strict_axes keyword and added axes_all, axes_superset and axes_subset keywords

version 1.0.3

2015-06-23

Added default keyword to fill_value() and fixed bugs when doing delattr on _fillValue and missing_value properties.

version 1.0.2

2015-06-05

PyPI release

version 1.0.1

2015-06-01

Fixed bug in when using the select keyword to cf.read

version 1.0

2015-05-27

Mac OS support
Limited Nd functionality to cf.Field.indices
Correct treatment of add_offset and scale_factor
Replaced -a with -x in cfa and cfdump scripts
added ncvar_identities parameter to cf.aggregate
Performance improvements to field subspacing
Documentation
Improved API to match, select, items, axes, etc.
Reads UM fields files
Optimised reading PP and UM fields files
cf.collapse replaced by cf.Field.collapse
cf.Field.collapse includes CF climatological time statistics

version 0.9.9.1

2015-01-09

Fixed bug for changes to netCDF4-python library versions >= 1.1.2
Miscellaneous bug fixes

version 0.9.9

2015-01-05

Added netCDF4 compression options to cf.write.
Added __mod__, __imod__, __rmod__, ceil, floor, trunc, rint methods to cf.Data and cf.Variable
Added ceil, floor, trunc, rint to cf.Data and cf.Variable
Fixed bug in which array cf.Data.array sometimes behaved like cf.Data.varray
Fixed bug in cf.netcdf.read.read which affected reading fields with formula_terms.
Refactored the test suite to use the unittest package
Cyclic axes functionality
Documentation updates

version 0.9.8.3

2014-07-14

Implemented multiple grid_mappings (CF trac ticket #70)
Improved functionality and speed of field aggregation and cfa and cfdump command line utilities.
Collapse methods on cf.Data object (min, max, mean, var, sd, sum, range, mid_range).
Improved match/select functionality

version 0.9.8.2

2014-03-13

Copes with PP fields with 365_day calendars
Revamped CFA files in line with the evolving standard. CFA files from PP data created with a previous version will no longer work.

version 0.9.8

2013-12-06

Improved API.
Plenty of speed and memory optimisations.
A proper treatment of datetimes.
WGDOS-packed PP fields are now unpacked on demand.
Fixed bug in functions.py for numpy v1.7. Fixed bug when deleting the 'id' attribute.
Assign a standard name to aggregated PP fields after aggregation rather than before (because some stash codes are too similar, e.g. 407 and 408).
New subclasses of `cf.Coordinate`: cf.DimensionCoordinate and cf.AuxiliaryCoordinate.
A cf.Units object is now immutable.

version 0.9.7.1

2013-04-26

Fixed endian bug in CFA-netCDF files referring to PP files
Changed default output format to NETCDF3_CLASSIC and trap error when when writing unsigned integer types and the 64-bit integer type to file formats other than NETCDF4.
Changed unhelpful history created when aggregating

version 0.9.7

2013-04-24

Read and write CFA-netCDF files
cf.Field creation interface
New command line utilities: cfa, cfdump
Redesigned repr, str and dump() output (which is shared with cfa and cfdump)
Removed superseded (by cfa) command line utilities pp2cf, cf2cf
Renamed the 'subset' method to 'select'
Now needs netCDF4-python 0.9.7 or later (and numpy 1.6 or later)

version 0.9.6.2

2013-03-27

Fixed bug in cf/pp.py which caused the creation of incorrect latitude coordinate arrays.

version 0.9.6.1

2013-02-20

Fixed bug in cf/netcdf.py which caused a failure when a file with badly formatted units was encountered.

version 0.9.6

2012-11-27

Assignment to a field's data array with metadata-aware broadcasting, assigning to subspaces, assignment where data meets conditions, assignment to unmasked elements, etc. (setitem method)
Proper treatment of the missing data mask, including metadata-aware assignment (setmask method)
Proper treatment of ancillary data.
Ancillary data and transforms are subspaced with their parent field.
Much faster aggregation algorithm (with thanks to Jonathan Gregory). Also aggregates fields transforms, ancillary variables and flags.

version 0.9.5 (first LAMA release)

2012-10-01

Restructured documentation and package code files.
Large Amounts of Massive Arrays (LAMA) functionality.
Metadata-aware field manipulation and combination with metadata-aware broadcasting.
Better treatment of cell measures.
Slightly faster aggregation algorithm (a much improved one is in development).
API changes for clarity.
Bug fixes.
Added 'TEMPDIR' to the cf.CONSTANTS dictionary
This is a snapshot of the trunk at revision r195.

version 0.9.5.dev

2012-09-19

Loads of exciting improvements - mainly LAMA functionality, metadata-aware field manipulation and documentation.
This is a snapshot of the trunk at revision r185. A proper vn0.9.5 release is imminent.

version 0.9.4.2

2012-04-17

General bug fixes and code restructure

version 0.9.4

2012-03-15

A proper treatment of units using the Udunits C library and the extra time functionality provided by the netCDF4 package.
A command line script to do CF-netCDF to CF-netCDF via cf-python.

version 0.9.3.3

2012-02-08

Objects renamed in line with the CF data model: cf.Space becomes cf.Field and cf.Grid becomes cf.Space.
Field aggregation using the CF aggregation rules is available when reading fields from disk and on fields in memory. The data of a field resulting from aggregation are stored as a collection of the data from the component fields and so, as before, may be file pointers, arrays in memory or a mixture of these two forms.
Units, missing data flags, dimension order, dimension direction and packing flags may all be different between data components and are conformed at the time of data access.
Files in UK Met Office PP format may now be read into CF fields.
A command line script for PP to CF-netCDF file conversion is provided.

version 0.9.3

2012-01-05

A more consistent treatment of spaces and lists of spaces (cf.Space and cf.SpaceList objects respectively).
A corrected treatment of scalar or 1-d, size 1 dimensions in the space and its grid.
Data stored in cf.Data objects which contain metadata need to correctly interpret and manipulate the data. This will be particularly useful when data arrays spanning many files/arrays is implemented.

version 0.9.2

2011-08-26

Created a setup.py script for easier installation (with thanks to Jeff Whitaker).
Added support for reading OPeNDAP-hosted datasets given by URLs.
Restructured the documentation.
Created a test directory with scripts and sample output.
No longer fails for unknown calendar types (such as '360d').

version 0.9.1

2011-08-06

First release.

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