cf.Domain

---

class cfdm.Domain(properties=None, source=None, copy=True, _use_data=True)

Bases: cfdm.mixin.fielddomain.FieldDomain, cfdm.mixin.netcdf.NetCDFVariable, cfdm.mixin.netcdf.NetCDFGeometry, cfdm.mixin.netcdf.NetCDFGlobalAttributes, cfdm.mixin.netcdf.NetCDFGroupAttributes, cfdm.mixin.netcdf.NetCDFComponents, cfdm.mixin.netcdf.NetCDFUnreferenced, cfdm.mixin.properties.Properties, cfdm.mixin.files.Files, cfdm.core.domain.Domain

A domain construct of the CF data model.

The domain represents a set of discrete “locations” in what generally would be a multi-dimensional space, either in the real world or in a model’s simulated world. The data array elements of a field construct correspond to individual location of a domain.

The domain construct is defined collectively by the following constructs of the CF data model: domain axis, dimension coordinate, auxiliary coordinate, cell measure, coordinate reference, and domain ancillary constructs; as well as properties to describe the domain.

NetCDF interface

The netCDF variable name may be accessed with the nc_set_variable, nc_get_variable, nc_del_variable, and nc_has_variable methods.

The netCDF variable group structure may be accessed with the nc_set_variable, nc_get_variable, nc_variable_groups, nc_clear_variable_groups, and nc_set_variable_groups methods.

The selection of properties to be written as netCDF global attributes may be accessed with the nc_global_attributes, nc_clear_global_attributes, and nc_set_global_attribute methods.

The netCDF group attributes may be accessed with the nc_group_attributes, nc_clear_group_attributes, nc_set_group_attribute, and nc_set_group_attributes methods.

The netCDF geometry variable name and group structure may be accessed with the nc_set_geometry_variable, nc_get_geometry_variable, nc_geometry_variable_groups, nc_clear_variable_groups, and nc_set_geometry_variable_groups methods.

Some components exist within multiple constructs, but when written to a netCDF dataset the netCDF names associated with such components will be arbitrarily taken from one of them. The netCDF variable, dimension and sample dimension names and group structures for such components may be set or removed consistently across all such components with the nc_del_component_variable, nc_set_component_variable, nc_set_component_variable_groups, nc_clear_component_variable_groups, nc_del_component_dimension, nc_set_component_dimension, nc_set_component_dimension_groups, nc_clear_component_dimension_groups, nc_del_component_sample_dimension, nc_set_component_sample_dimension, nc_set_component_sample_dimension_groups, and nc_clear_component_sample_dimension_groups methods.

New in version (cfdm): 1.7.0

Initialisation

Parameters

properties: dict, optional

Set descriptive properties. The dictionary keys are property names, with corresponding values.

Properties may also be set after initialisation with the set_properties and set_property methods.

Parameter example:

properties={'long_name': 'Domain for model'}

source: optional

Convert source, which can be any type of object, to a Domain instance.

All other parameters, apart from copy, are ignored and their values are instead inferred from source by assuming that it has the Domain API. Any parameters that can not be retrieved from source in this way are assumed to have their default value.

Note that if x is also a Domain instance then cfdm.Domain(source=x) is equivalent to x.copy().

A new domain may also be instantiated with the fromconstructs class method.

copy: bool, optional

If True (the default) then deep copy the input parameters prior to initialisation. By default the parameters are not deep copied.

Methods

Inspection

Methods

dump	A full description of the domain construct.
identity	Return the canonical identity.
identities	Return all possible identities.

Attributes

construct_type	Return a description of the construct type.
size	The number of locations in the domain.
rank	The number of axes in the domain.

Properties

Methods

del_property	Remove a property.
get_property	Get a CF property.
has_property	Whether a property has been set.
set_property	Set a property.
properties	Return all properties.
clear_properties	Remove all properties.
del_properties	Remove properties.
set_properties	Set properties.

Attributes

calendar	The calendar CF property.
comment	The comment CF property.
history	The history CF property.
leap_month	The leap_month CF property.
leap_year	The leap_year CF property.
long_name	The long_name CF property.
month_lengths	The month_lengths CF property.
standard_name	The standard_name CF property.
units	The units CF property.
valid_max	The valid_max CF property.
valid_min	The valid_min CF property.
valid_range	The valid_range CF property.

Selection

Methods

match_by_identity	Whether or not the construct identity satisfies conditions.
match_by_ncvar	Whether or not the netCDF variable name satisfies conditions.
match_by_property	Whether or not properties satisfy conditions.
match_by_rank	Whether or not the number of domain axis constructs satisfies conditions.
match_by_construct	Whether or not there are particular metadata constructs.

Rearranging

Methods

anchor	Roll a cyclic axis so that the given value lies in the first coordinate cell.
roll	Roll the field along a cyclic axis.
flip	Flip (reverse the direction of) domain axes.
transpose	Permute the data axes of the metadata constructs.

Metadata constructs

Methods

auxiliary_coordinates	Return auxiliary coordinate constructs.
auxiliary_coordinate	Select an auxiliary coordinate construct.
cell_connectivities	Select cell connectivity constructs.
cell_connectivity	Select a cell connectivity construct.
cell_measures	Return cell measure constructs.
cell_measure	Select a cell measure construct.
coordinates	Return dimension and auxiliary coordinate constructs.
coordinate	Select a dimension or auxiliary coordinate construct.
coordinate_references	Return coordinate reference constructs.
coordinate_reference	Return a coordinate reference construct, or its key.
dimension_coordinates	Return dimension coordinate constructs.
dimension_coordinate	Select a dimension coordinate construct.
domain_ancillaries	Return domain ancillary constructs.
domain_ancillary	Select a domain ancillary construct.
domain_axes	Return domain axis constructs.
domain_axis	Select a domain axis construct.
domain_topologies	Return domain topology constructs.
domain_topology	Select a domain topology construct.
construct	Return a metadata construct.
construct_item	Return a metadata construct and its identifier.
construct_key	Return the identifier of a metadata construct.
del_construct	Remove a metadata construct.
get_construct	Return a metadata construct.
has_construct	Whether a unique metadata construct exists.
set_construct	Set a metadata construct.
replace_construct	Replace a metadata construct.
del_data_axes	Removes the keys of the axes spanned by the construct data.
get_data_axes	Gets the keys of the axes spanned by the construct data.
has_data_axes	Whether the axes spanned by the construct data have been set.
set_data_axes	Sets domain axis constructs spanned by the construct data.
auxiliary_to_dimension	Move auxiliary coordinates to a dimension coordinate construct.
dimension_to_auxiliary	Move dimension coordinates to an auxiliary coordinate construct.
coordinate_reference_domain_axes	Return the domain axes that apply to a coordinate reference construct.
get_coordinate_reference	Return a coordinate reference construct.
set_coordinate_reference	Set a coordinate reference construct.
del_coordinate_reference	Remove a coordinate reference construct and all of its domain ancillary constructs.
domain_axis_key	Returns the domain axis key spanned by 1-d coordinates.
del_domain_axis	Remove a domain axis construct.
climatological_time_axes	Return all axes which are climatological time axes.

Attributes

constructs

Return the metadata constructs.

Miscellaneous

Methods

apply_masking	Apply masking as defined by the CF conventions.
climatological_time_axes	Return all axes which are climatological time axes.
copy	Return a deep copy.
create_regular	Create a new domain with the regular longitudes and latitudes.
creation_commands	Return the commands that would create the domain construct.
equals	Whether two constructs are the same.
fromconstructs	Return a new domain containing the given metadata constructs.
has_bounds	Whether or not there are cell bounds.
has_data	Whether or not the construct has data.
has_geometry	Return whether or not any coordinates have cell geometries.
apply_masking	Apply masking as defined by the CF conventions.
get_original_filenames	The names of files containing the original data and metadata.
close	Close all files referenced by the domain construct.
uncompress	Uncompress the domain construct.

Domain axes

autocyclic	Set dimensions to be cyclic.
axes	Alias for domain_axes.
axis	Alias for domain_axis.
cyclic	Get or set the cyclicity of an axis.
direction	Whether or not a domain axis is increasing.
directions	Return a dictionary mapping all domain axes to their directions.
iscyclic	Returns True if the given axis is cyclic.

Subspacing

indices	Create indices that define a subspace of the domain construct.
subspace	Create a subspace of the field construct.

NetCDF

Methods

nc_del_variable	Remove the netCDF variable name.
nc_get_variable	Return the netCDF variable name.
nc_has_variable	Whether the netCDF variable name has been set.
nc_set_variable	Set the netCDF variable name.
nc_global_attributes	Returns properties to write as netCDF global attributes.
nc_clear_global_attributes	Removes properties to write as netCDF global attributes.
nc_set_global_attribute	Select a property to be written as a netCDF global attribute.
nc_set_global_attributes	Set properties to be written as netCDF global attributes.

Groups

Methods

nc_variable_groups	Return the netCDF variable group hierarchy.
nc_set_variable_groups	Set the netCDF variable group hierarchy.
nc_clear_variable_groups	Remove the netCDF variable group hierarchy.
nc_group_attributes	Returns properties to write as netCDF group attributes.
nc_clear_group_attributes	Removes properties to write as netCDF group attributes.
nc_set_group_attribute	Select a property to be written as a netCDF group attribute.
nc_set_group_attributes	Set properties to be written as netCDF group attributes.

CFA

Methods

add_file_location	Add a new file location in-place.
cfa_clear_file_substitutions	Remove all of the CFA-netCDF file name substitutions.
cfa_del_file_substitution	Remove a CFA-netCDF file name substitution.
cfa_file_substitutions	Return the CFA-netCDF file name substitutions.
cfa_update_file_substitutions	Set CFA-netCDF file name substitutions.
del_file_location	Remove a file location in-place.
file_locations	The locations of files containing parts of the components data.

Geometries

Methods

nc_del_geometry_variable	Remove the netCDF geometry container variable name.
nc_get_geometry_variable	Return the netCDF geometry container variable name.
nc_has_geometry_variable	Whether a netCDF geometry container variable has a name.
nc_set_geometry_variable	Set the netCDF geometry container variable name.
nc_geometry_variable_groups	Return the netCDF geometry variable group hierarchy.
nc_set_geometry_variable_groups	Set the netCDF geometry variable group hierarchy.
nc_clear_geometry_variable_groups	Remove the netCDF geometry variable group hierarchy.

Components

Methods

nc_del_component_variable	Remove the netCDF variable name of components.
nc_set_component_variable	Set the netCDF variable name for components.
nc_set_component_variable_groups	Set the netCDF variable groups of components.
nc_clear_component_variable_groups	Remove the netCDF variable groups of components.
nc_del_component_dimension	Remove the netCDF dimension name of components.
nc_set_component_dimension	Set the netCDF dimension name of components.
nc_set_component_dimension_groups	Set the netCDF dimension groups of components.
nc_clear_component_dimension_groups	Remove the netCDF dimension groups of components.
nc_del_component_sample_dimension	Remove the netCDF sample dimension name of components.
nc_set_component_sample_dimension	Set the netCDF sample dimension name of components.
nc_set_component_sample_dimension_groups	Set the netCDF sample dimension groups of components.
nc_clear_component_sample_dimension_groups	Remove the netCDF sample dimension groups of components.

Dataset compliance

Methods

dataset_compliance

Return the dataset compliance report.

Aliases

Methods

aux	Alias for auxiliary_coordinate.
auxs	Alias for coordinates.
axis	Alias for domain_axis.
coord	Alias for coordinate.
coords	Alias for coordinates.
dim	Alias for dimension_coordinate.
dims	Alias for dimension_coordinates.
domain_anc	Alias for domain_ancillary.
domain_ancs	Alias for domain_ancillaries.
key	Alias for construct_key.
match	Alias for match_by_identity.
measure	Alias for cell_measure.
measures	Alias for cell_measures.
ref	Alias for coordinate_reference.
refs	Alias for coordinate_references.

Deprecated

Methods

delprop	Deprecated at version 3.0.0, use method del_property instead.
get_filenames	Return the file names containing the metadata construct data.
getprop	Deprecated at version 3.0.0, use method get_property instead.
hasprop	Deprecated at version 3.0.0, use method has_property instead.
setprop	Deprecated at version 3.0.0, use method set_property instead.

Special

Methods

__deepcopy__	Called by the copy.deepcopy function.
__repr__	Called by the repr built-in function.
__str__	Called by the str built-in function.

Docstring substitutions

Methods

_docstring_special_substitutions	Return the special docstring substitutions.
_docstring_substitutions	Returns the substitutions that apply to methods of the class.
_docstring_package_depth	Returns the class {{package}} substitutions package depth.
_docstring_method_exclusions	Returns method names excluded in the class substitutions.