cfdm.CellMeasure


class cfdm.CellMeasure(measure=None, properties=None, data=None, source=None, copy=True, _use_data=True)[source]

Bases: cfdm.mixin.netcdf.NetCDFVariable, cfdm.mixin.netcdf.NetCDFExternal, cfdm.mixin.propertiesdata.PropertiesData, cfdm.core.cellmeasure.CellMeasure

A cell measure construct of the CF data model.

A cell measure construct provides information that is needed about the size or shape of the cells and that depends on a subset of the domain axis constructs. Cell measure constructs have to be used when the size or shape of the cells cannot be deduced from the dimension or auxiliary coordinate constructs without special knowledge that a generic application cannot be expected to have.

The cell measure construct consists of a numeric array of the metric data which spans a subset of the domain axis constructs, and properties to describe the data. The cell measure construct specifies a “measure” to indicate which metric of the space it supplies, e.g. cell horizontal areas, and must have a units property consistent with the measure, e.g. square metres. It is assumed that the metric does not depend on axes of the domain which are not spanned by the array, along which the values are implicitly propagated. CF-netCDF cell measure variables correspond to cell measure constructs.

NetCDF interface

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

New in version 1.7.0.

Initialisation

Parameters:
measure: str, optional

Set the measure that indicates which metric given by the data array. Ignored if the source parameter is set.

Parameter example:

measure='area'

The measure may also be set after initialisation with the set_measure method.

properties: dict, optional

Set descriptive properties. The dictionary keys are property names, with corresponding values. Ignored if the source parameter is set.

Parameter example:

properties={'standard_name': 'cell_area'}

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

data: Data, optional

Set the data array. Ignored if the source parameter is set.

The data array may also be set after initialisation with the set_data method.

source: optional

Initialize the measure, properties and data from those of source.

copy: bool, optional

If False then do not deep copy input parameters prior to initialization. By default arguments are deep copied.

Inspection

Methods

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

Attributes

construct_type Return a description of the construct type.

Properties

Methods

del_measure Remove the measure.
get_measure Return the measure.
has_measure Whether the measure has been set.
set_measure Set the measure.
del_property Remove a property.
get_property Return a property.
has_property Whether a property has been set.
set_property Set a property.
properties Return all properties.
clear_properties Remove all properties.
set_properties Set properties.

Data

Methods

del_data Remove the data.
get_data Return the data.o
has_data Whether a data has been set.
set_data Set the data.
insert_dimension Expand the shape of the data array.
squeeze Remove size one axes from the data array.
transpose Permute the axes of the data array.

Attributes

data Return the data.

Miscellaneous

Methods

copy Return a deep copy.
equals Whether two cell measure constructs are the same.

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_get_external Whether the construct corresponds to an external netCDF variable.
nc_set_external Set external status of a netCDF variable.

Special

Methods

__deepcopy__ Called by the copy.deepcopy function.
__getitem__ Return a subspace defined by indices
__repr__ Called by the repr built-in function.
__str__ Called by the str built-in function.