cf.InterpolationParameter

---

class cf.InterpolationParameter(*args, **kwargs)

An interpolation parameter variable.

Space may be saved by storing a subsample of the coordinates. The uncompressed coordinates can be reconstituted by interpolation from the subsampled coordinate values, also called either “tie points” or “bounds tie points”.

An interpolation parameter variable provides values for coefficient terms in the interpolation equation, or for any other terms that configure the interpolation process.

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.

{{netCDF HDF5 chunks}}

The netCDF subsampled dimension name and the netCDF interpolation subarea dimension name, if required, are set on the on the corresponding tie point index variable.

Added in version (cfdm): 1.10.0.0

See also

TiePointIndex

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={'standard_name': 'altitude'}

data: data_like, optional

Set the data.

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

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

source: optional

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

All other parameters, apart from copy, are ignored and their values are instead inferred from source by assuming that it has the InterpolationParameter 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 InterpolationParameter instance then cf.InterpolationParameter(source=x) is equivalent to x.copy().

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

Methods

Data	Deprecated at version 3.0.0, use data attribute or get_data method instead.
T	True if and only if the data are coordinates for a CF 'T' axis.
Units	The cf.Units object containing the units of the data array.
X	Always False.
Y	Always False.
Z	Always False.
add_offset	The add_offset CF property.
all	Test whether all data elements evaluate to True.
allclose	Test whether all data are element-wise equal to other, broadcastable data.
any	Test whether any data elements evaluate to True.
apply_masking	Apply masking as defined by the CF conventions.
arccos	Take the trigonometric inverse cosine of the data element- wise.
arccosh	Take the inverse hyperbolic cosine of the data element-wise.
arcsin	Take the trigonometric inverse sine of the data element-wise.
arcsinh	Take the inverse hyperbolic sine of the data element-wise.
arctan	Take the trigonometric inverse tangent of the data element- wise.
arctanh	Take the inverse hyperbolic tangent of the data element-wise.
array	A numpy array deep copy of the data.
asdatetime	Deprecated at version 3.0.0.
asreftime	Deprecated at version 3.0.0.
attributes	Deprecated at version 3.0.0.
binary_mask	A binary (0 and 1) missing data mask of the data array.
calendar	The calendar CF property.
ceil	The ceiling of the data, element-wise.
chunk	Partition the data array.
clear_properties	Remove all properties.
clip	Limit the values in the data.
close	Close all files referenced by the construct.
comment	The comment CF property.
concatenate	Join a together sequence of InterpolationParameter.
convert_reference_time	Convert reference time data values to have new units.
copy	Return a deep copy.
cos	Take the trigonometric cosine of the data element-wise.
cosh	Take the hyperbolic cosine of the data element-wise.
count	Count the non-masked elements of the data.
count_masked	Count the masked elements of the data.
creation_commands	Return the commands that would create the construct.
cyclic	Get or set the cyclicity of an axis.
data	The Data object containing the data array.
datetime_array	An independent numpy array of date-time objects.
datum	Return an element of the data array as a standard Python scalar.
day	The day of each date-time data array element.
del_data	Remove the data.
del_properties	Remove properties.
del_property	Remove a property.
delprop	Deprecated at version 3.0.0, use method del_property instead.
dtarray	Alias for datetime_array.
dtvarray	Deprecated at version 3.0.0.
dtype	The numpy data type of the data array.
dump	A full description of the interpolation parameter variable.
equals	Whether two instances are the same.
equivalent	True if two constructs are equal, False otherwise.
exp	The exponential of the data, element-wise.
expand_dims	Deprecated at version 3.0.0, use insert_dimension method instead.
file_directories	The directories of files containing parts of the data.
fill_value	Return the data array missing data value.
filled	Replace masked elements with a fill value.
flatten	Flatten axes of the data.
flip	Flip (reverse the direction of) data dimensions.
floor	Floor the data array, element-wise.
get_data	Return the data.
get_filenames	Return the name of the file or files containing the data.
get_original_filenames	The names of files containing the original data and metadata.
get_property	Get a CF property.
get_quantization	Get quantization metadata.
get_quantize_on_write	Get a quantize-on-write instruction.
getprop	Deprecated at version 3.0.0, use method get_property instead.
halo	Expand the data by adding a halo.
hardmask	Whether the mask is hard (True) or soft (False).
has_bounds	Whether or not there are cell bounds.
has_data	Whether or not the construct has data.
has_property	Whether a property has been set.
hasbounds	Deprecated at version 3.0.0, use has_bounds method instead.
hasdata	Deprecated at version 3.0.0, use has_data method instead.
hasprop	Deprecated at version 3.0.0, use method has_property instead.
history	The history CF property.
hour	The hour of each date-time data array element.
id	An identity for the InterpolationParameter object.
identities	Return all possible identities.
identity	Return the canonical identity.
insert_data	Deprecated at version 3.0.0, use set_data method instead.
insert_dimension	Expand the shape of the data array.
inspect	Inspect the object for debugging.
isauxiliary	Deprecated at version 3.7.0, use construct_type attribute instead.
iscyclic	Whether or not a given axis is cyclic.
isdimension	Deprecated at version 3.7.0, use construct_type attribute instead.
isdomainancillary	Deprecated at version 3.7.0, use construct_type attribute instead.
isfieldancillary	Deprecated at version 3.7.0, use construct_type attribute instead.
ismeasure	Deprecated at version 3.7.0, use construct_type attribute instead.
isperiodic	True if a given axis is periodic.
isscalar	True if the data array is scalar.
leap_month	The leap_month CF property.
leap_year	The leap_year CF property.
log	The logarithm of the data array.
long_name	The long_name CF property.
mask	The mask of the data array.
mask_invalid	Mask the array where invalid values occur.
masked_invalid	Mask the array where invalid values occur (NaN or inf).
match	Alias for match_by_identity.
match_by_identity	Whether or not the construct identity satisfies conditions.
match_by_naxes	Whether or not the data has a given dimensionality.
match_by_ncvar	Whether or not the netCDF variable name satisfies conditions.
match_by_property	Whether or not properties satisfy conditions.
match_by_units	Whether or not the construct has given units.
max	Alias for maximum.
maximum	The maximum of the data array.
mean	The unweighted mean the data array.
mid_range	The unweighted average of the maximum and minimum of the data array.
min	Alias for minimum.
minimum	The minimum of the data array.
minute	The minute of each date-time data array element.
missing_value	The missing_value CF property.
month	The month of each date-time data array element.
month_lengths	The month_lengths CF property.
name	Deprecated at version 3.0.0, use method 'identity' instead.
nc_clear_dataset_chunksizes	Clear the dataset chunking strategy for the data.
nc_clear_hdf5_chunksizes	Clear the HDF5 chunking strategy for the data.
nc_clear_variable_groups	Remove the netCDF variable group hierarchy.
nc_dataset_chunksizes	Get the dataset chunking strategy for the data.
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_hdf5_chunksizes	Get the HDF5 chunking strategy for the data.
nc_set_dataset_chunksizes	Set the dataset chunking strategy.
nc_set_hdf5_chunksizes	Set the HDF5 chunking strategy.
nc_set_variable	Set the netCDF variable name.
nc_set_variable_groups	Set the netCDF variable group hierarchy.
nc_variable_groups	Return the netCDF variable group hierarchy.
ndim	The number of data dimensions.
override_calendar	Override the calendar of date-time units.
override_units	Override the units.
pad_missing	Pad an axis with missing data.
period	Return or set the period of the data.
persist	Persist data into memory.
properties	Return all properties.
range	The absolute difference between the maximum and minimum of the data array.
rechunk	Change the chunk structure of the data.
reference_datetime	The reference date-time of units of elapsed time.
remove_data	Deprecated at version 3.0.0, use method del_data instead.
replace_directory	Replace a file directory in-place.
rint	Round the data to the nearest integer, element-wise.
roll	Roll the data along one or more axes.
round	Round the data to the given number of decimals.
sample_size	The number of non-missing data elements in the data array.
scale_factor	The scale_factor CF property.
sd	Alias for standard_deviation
second	The second of each date-time data array element.
select	Deprecated at version 3.0.0.
set_data	Set the data.
set_properties	Set properties.
set_property	Set a property.
setprop	Deprecated at version 3.0.0, use method set_property instead.
shape	A tuple of the data array's dimension sizes.
sin	Take the trigonometric sine of the data element-wise.
sinh	Take the hyperbolic sine of the data element-wise.
size	The number elements in the data.
squeeze	Remove size one axes from the data array.
standard_deviation	The unweighted sample standard deviation of the data array.
standard_name	The standard_name CF property.
subspace	Return a new variable whose data is subspaced.
sum	The sum of the data array.
swapaxes	Interchange two axes of an array.
tan	Take the trigonometric tangent of the data element-wise.
tanh	Take the hyperbolic tangent of the data array.
to_dask_array	Convert the data to a dask array.
to_memory	Bring data on disk into memory.
to_units	Change the data array units.
transpose	Permute the axes of the data array.
trunc	Truncate the data, element-wise.
uncompress	Uncompress the construct.
unique	The unique elements of the data.
units	The units CF property.
unsafe_array	Deprecated at version 3.0.0, use array attribute instead.
valid_max	The valid_max CF property.
valid_min	The valid_min CF property.
valid_range	The valid_range CF property.
var	Alias for variance
variance	The unweighted sample variance of the data array.
varray	A numpy array view of the data.
where	Set data array elements depending on a condition.
year	The year of each date-time data array element.