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UnitMap - Unit (null) Mapping

Description:
A UnitMap is a unit (null) Mapping that has no effect on the coordinates supplied to it. They are simply copied. This can be useful if a Mapping is required (e.g. to pass to another routine) but you do not want it to have any effect. The Nin and Nout attributes of a UnitMap are always equal and are specified when it is created.
Constructor Function:
AST_UNITMAP
Inheritance
The UnitMap class inherits from the Mapping class.
Attributes
The UnitMap class does not define any new attributes beyond those which are applicable to all Mappings.
Functions
The UnitMap class does not define any new routines beyond those which are applicable to all Mappings.


next up previous 264
Next: WcsMap - Implement a FITS-WCS sky projection
Up: AST Class Descriptions
Previous: TranMap - Mapping with specified forward and inverse transformations

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council