BaseTableCoordinate#

class ndcube.extra_coords.BaseTableCoordinate(*tables, mesh=False, names=None, physical_types=None)[source]#

Bases: ABC

A Base LookupTable contains a single lookup table coordinate.

This can be multi-dimensional, to support use cases for coupled dimensions, such as SkyCoord, or a 3D grid of distances where three 1D lookup tables are supplied for each of the axes. The upshot of this is that each BaseLookupTable has only one gWCS frame.

The contrasts with LookupTableCoord which can contain multiple physical coordinates, meaning it can have multiple gWCS frames.

Attributes Summary

`dropped_world_dimensions`
`frame`	Generate the Frame for this LookupTable.
`model`	Generate the Astropy Model for this LookupTable.
`n_inputs`	Number of pixel dimensions in this table.
`wcs`	A gWCS object representing all the coordinates.

Methods Summary

is_scalar()

Return a boolean if this coordinate is a scalar.

Attributes Documentation

dropped_world_dimensions#

frame#: Generate the Frame for this LookupTable.

model#: Generate the Astropy Model for this LookupTable.

n_inputs#: Number of pixel dimensions in this table.

wcs#: A gWCS object representing all the coordinates.

Methods Documentation

abstract is_scalar()[source]#

Return a boolean if this coordinate is a scalar.

This is used by MultipleTableCoordinate and ndcube.ExtraCoords to know if the dimension has been “dropped”.