BaseWCSWrapper

class astropy.wcs.wcsapi.BaseWCSWrapper(wcs, *args, **kwargs)

Bases: astropy.wcs.wcsapi.BaseLowLevelWCS

A base wrapper class for things that modify Low Level WCSes.

This wrapper implements a transparent wrapper to many of the properties, with the idea that not all of them would need to be overridden in your wrapper, but some probably will.

Parameters

wcsastropy.wcs.wcsapi.BaseLowLevelWCS

The WCS object to wrap

Attributes Summary

axis_correlation_matrix	Returns an (world_n_dim, pixel_n_dim) matrix that indicates using booleans whether a given world coordinate depends on a given pixel coordinate.
pixel_axis_names	An iterable of strings describing the name for each pixel axis.
pixel_bounds	The bounds (in pixel coordinates) inside which the WCS is defined, as a list with pixel_n_dim (min, max) tuples.
pixel_n_dim	The number of axes in the pixel coordinate system.
pixel_shape	The shape of the data that the WCS applies to as a tuple of length pixel_n_dim in (x, y) order (where for an image, x is the horizontal coordinate and y is the vertical coordinate).
serialized_classes	Indicates whether Python objects are given in serialized form or as actual Python objects.
world_axis_names	An iterable of strings describing the name for each world axis.
world_axis_object_classes	A dictionary giving information on constructing high-level objects for the world coordinates.
world_axis_object_components	A list with world_n_dim elements giving information on constructing high-level objects for the world coordinates.
world_axis_physical_types	An iterable of strings describing the physical type for each world axis.
world_axis_units	An iterable of strings given the units of the world coordinates for each axis.
world_n_dim	The number of axes in the world coordinate system.

Methods Summary

pixel_to_world_values(*pixel_arrays)	Convert pixel coordinates to world coordinates.
world_to_pixel_values(*world_arrays)	Convert world coordinates to pixel coordinates.

Attributes Documentation

axis_correlation_matrix

pixel_axis_names

pixel_bounds

pixel_n_dim

pixel_shape

serialized_classes

world_axis_names

world_axis_object_classes

world_axis_object_components

world_axis_physical_types

world_axis_units

world_n_dim

Methods Documentation

abstract pixel_to_world_values(*pixel_arrays)

Convert pixel coordinates to world coordinates.

This method takes pixel_n_dim scalars or arrays as input, and pixel coordinates should be zero-based. Returns world_n_dim scalars or arrays in units given by world_axis_units. Note that pixel coordinates are assumed to be 0 at the center of the first pixel in each dimension. If a pixel is in a region where the WCS is not defined, NaN can be returned. The coordinates should be specified in the (x, y) order, where for an image, x is the horizontal coordinate and y is the vertical coordinate.

If world_n_dim is 1, this method returns a single scalar or array, otherwise a tuple of scalars or arrays is returned.

abstract world_to_pixel_values(*world_arrays)

Convert world coordinates to pixel coordinates.

This method takes world_n_dim scalars or arrays as input in units given by world_axis_units. Returns pixel_n_dim scalars or arrays. Note that pixel coordinates are assumed to be 0 at the center of the first pixel in each dimension. If a world coordinate does not have a matching pixel coordinate, NaN can be returned. The coordinates should be returned in the (x, y) order, where for an image, x is the horizontal coordinate and y is the vertical coordinate.

If pixel_n_dim is 1, this method returns a single scalar or array, otherwise a tuple of scalars or arrays is returned.