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The AST Class Hierarchy  

The following table shows the hierarchy of classes in the AST library. For a description of each class, you should consult [*].

Object             - Base class for all AST Objects
   Axis            - Store axis information
      SkyAxis      - Store celestial axis information
   Channel         - Basic (textual) I/O channel
      FitsChan     - I/O Channel using FITS header cards
   Mapping         - Inter-relate two coordinate systems
      CmpMap       - Compound Mapping
      DssMap       - Map points using Digitised Sky Survey plate solution
      Frame        - Coordinate system description
         CmpFrame  - Compound Frame
         FrameSet  - Set of inter-related coordinate systems
            Plot   - Provide facilities for graphical output
         SkyFrame  - Celestial coordinate system description
         SpecFrame - Spectral coordinate system description
      IntraMap     - Map points using a private transformation function
      LutMap       - Transform 1-dimensional coordinates using a lookup table
      MathMap      - Transform coordinates using mathematical expressions
      MatrixMap    - Map positions by multiplying them by a matrix
      PcdMap       - Apply 2-dimensional pincushion/barrel distortion
      PermMap      - Coordinate permutation Mapping
      SlaMap       - Sequence of celestial coordinate conversions
      SpecMap      - Sequence of spectral coordinate conversions
      SphMap       - Map 3-d Cartesian to 2-d spherical coordinates
      UnitMap      - Unit (null) Mapping
      WcsMap       - Implement a FITS-WCS sky projection
      WinMap       - Match windows by scaling and shifting each axis
      ZoomMap      - Zoom coordinates about the origin



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Next: AST Function Descriptions
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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