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SKY2XY

SKY2XY

Name


    SKY2XY

Purpose


    Converts between sky coordinates and pixel coordinates of a FITS image
    using the WCSTOOLS sky2xy routine. Useful for images with WCS keywords
    that are not implemented in the astronomy library (such as the TNX
    convention for distortions).

Category


    Astro

Calling Sequence


    Result = SKY2XY(FITSFile, Ra, Dec)

Inputs


    FITSFile: Name of FITS file that contains the WCS to use.
    Ra: Vector of right ascensions. Assumed to be in decimal degrees unless
          /STRING is set.
    Dec: Vector of declinations. Assumed to be in decimal degrees unless
          /STRING is set.

Keyword Parameters


    STRING: If set, Ra and Dec are strings in HH:MM:SS, DD:MM:SS format.
    WCSTOOLSDIR: Path to the location of the binary sky2xy files in wcstools.

Outputs


    The function returns a structure with fields .X and .Y which are arrays
    containing the x and y pixel values.

Notes


    Requires WCSTOOLS to be installed, along with the UWashington TMPFILE
    and DIR_EXIST routines.

Modification History


    Written by: Jeremy Bailin
    20 August 2010 Initial release
    10 Feb 2011 Made WCSTOOLSDIR a keyword parameter.



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