AST_SKYOFFSETMAP

Returns a Mapping which goes from absolute coordinates to offset coordinates

Description:

This function returns a Mapping in which the forward transformation transforms a position in the coordinate system given by the System attribute of the supplied SkyFrame, into the offset coordinate system specified by the SkyRef, SkyRefP and SkyRefIs attributes of the supplied SkyFrame.

A UnitMap is returned if the SkyFrame does not define an offset coordinate system.

Invocation

RESULT = AST_SKYOFFSETMAP( THIS, STATUS )

Arguments

THIS = INTEGER (Given)
Pointer to the SkyFrame.
STATUS = INTEGER (Given and Returned)
The global status.

Returned Value

AST_SKYOFFSETMAP = INTEGER
Pointer to the returned Mapping.

Notes:

Copyright (C) 2021 East Asian Observatory