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Spatial file commands
The spatial descriptor (or ARD) file has been introduced into ASTERIX
as a method of defining complex areas on a 2-d surface. These files
are simple text files and may be created with an editor or by running
the REGIONS application (or an ICL procedure such as WELLARD). They
may then be used in the QUALITY program (to set pixels BAD or GOOD) or
in the future, they will be used to define regions to sort data within
in e.g. XSORT. For a full description of the file format see the Starlink
document SUN183.
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