# cfdm.core.CellMeasure¶

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

Bases: cfdm.core.abstract.propertiesdata.PropertiesData

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.

New in version (cfdm): 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.

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

Parameter example:

measure='area'

properties: dict, optional

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

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

Parameter example:

properties={'units': 'metres 2'}

data: data_like, optional

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

A data_like object is any object that can be converted to a Data object, i.e. numpy array_like objects, Data objects, and cfdm.core instances that contain Data objects.

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

source: optional

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

Note that if source is a CellMeasure instance then cfdm.core.CellMeasure(source=source) is equivalent to source.copy().

copy: bool, optional

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

## Inspection¶

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. has_data Whether or not the construct has data. set_data Set the data.

Attributes

 data Return the data.

## Miscellaneous¶

Methods

 copy Return a deep copy. has_bounds Whether or not there are cell bounds.

## Special¶

Methods

 __deepcopy__ Called by the copy.deepcopy 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.