BaseWCSWrapper¶

class
astropy.wcs.wcsapi.
BaseWCSWrapper
(wcs, *args, **kwargs)[source]¶ 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
 wcs
astropy.wcs.wcsapi.BaseLowLevelWCS
The WCS object to wrap
 wcs
Attributes Summary
The shape of the data that the WCS applies to as a tuple of length
pixel_n_dim
in(row, column)
order (the convention for arrays in Python).Returns an (
world_n_dim
,pixel_n_dim
) matrix that indicates using booleans whether a given world coordinate depends on a given pixel coordinate.An iterable of strings describing the name for each pixel axis.
The bounds (in pixel coordinates) inside which the WCS is defined, as a list with
pixel_n_dim
(min, max)
tuples.The number of axes in the pixel coordinate system.
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 andy
is the vertical coordinate).Indicates whether Python objects are given in serialized form or as actual Python objects.
An iterable of strings describing the name for each world axis.
A dictionary giving information on constructing highlevel objects for the world coordinates.
A list with
world_n_dim
elements giving information on constructing highlevel objects for the world coordinates.An iterable of strings describing the physical type for each world axis.
An iterable of strings given the units of the world coordinates for each axis.
The number of axes in the world coordinate system.
Methods Summary
array_index_to_world_values
(*index_arrays)Convert array indices to world coordinates.
pixel_to_world_values
(*pixel_arrays)Convert pixel coordinates to world coordinates.
world_to_array_index_values
(*world_arrays)Convert world coordinates to array indices.
world_to_pixel_values
(*world_arrays)Convert world coordinates to pixel coordinates.
Attributes Documentation

array_shape
¶ The shape of the data that the WCS applies to as a tuple of length
pixel_n_dim
in(row, column)
order (the convention for arrays in Python).If the WCS is valid in the context of a dataset with a particular shape, then this property can be used to store the shape of the data. This can be used for example if implementing slicing of WCS objects. This is an optional property, and it should return
None
if a shape is not known or relevant.

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

array_index_to_world_values
(*index_arrays)¶ Convert array indices to world coordinates.
This is the same as
pixel_to_world_values
except that the indices should be given in(i, j)
order, where for an imagei
is the row andj
is the column (i.e. the opposite order topixel_to_world_values
).If
world_n_dim
is1
, this method returns a single scalar or array, otherwise a tuple of scalars or arrays is returned.

abstract
pixel_to_world_values
(*pixel_arrays)[source]¶ Convert pixel coordinates to world coordinates.
This method takes
pixel_n_dim
scalars or arrays as input, and pixel coordinates should be zerobased. Returnsworld_n_dim
scalars or arrays in units given byworld_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 andy
is the vertical coordinate.If
world_n_dim
is1
, this method returns a single scalar or array, otherwise a tuple of scalars or arrays is returned.

world_to_array_index_values
(*world_arrays)¶ Convert world coordinates to array indices.
This is the same as
world_to_pixel_values
except that the indices should be returned in(i, j)
order, where for an imagei
is the row andj
is the column (i.e. the opposite order topixel_to_world_values
). The indices should be returned as rounded integers.If
pixel_n_dim
is1
, this method returns a single scalar or array, otherwise a tuple of scalars or arrays is returned.

abstract
world_to_pixel_values
(*world_arrays)[source]¶ Convert world coordinates to pixel coordinates.
This method takes
world_n_dim
scalars or arrays as input in units given byworld_axis_units
. Returnspixel_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 andy
is the vertical coordinate.If
pixel_n_dim
is1
, this method returns a single scalar or array, otherwise a tuple of scalars or arrays is returned.