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Inter-Relating Coordinate Systems (Mappings)  

In [*] we used the ZoomMap as an example of a Mapping. We saw how it could be used to transform coordinates from its input to its output and back again ([*]). We also saw how its behaviour could be controlled by setting various attributes, such as the Zoom factor and the Report attribute that made it display coordinate values as it transformed them.

In this section, we will look at Mappings a bit more thoroughly and explore the behaviour which is common to all the Mappings provided by AST. This is good background for what follows, because many of the Objects we discuss later will also turn out to be Mappings in various disguises.



 

next up previous
Next: The Mapping Class
Up: AST A Library for Handling World Coordinate Systems in Astronomy
Previous: Sharing the Error Status

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