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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 function) 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:
astUnitMap

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 functions beyond those which are applicable to all Mappings.



next up previous
Next: WcsMap - Implement a FITS-WCS sky projection
Up: AST Class Descriptions
Previous: SpecMap - Sequence of spectral coordinate conversions

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2003 Central Laboratory of the Research Councils