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[fitsbits] substring array convention



 
 
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Old March 9th 09, 07:42 PM posted to sci.astro.fits
William Pence[_2_]
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Default [fitsbits] substring array convention

One of the changes that was made in the new 3.0 version of the FITS
Standard document was to delete Appendix B, which described 2
conventions for storing arrays of strings in a FITS binary table. The
rational for deleting this appendix was that it would more appropriate
to document these conventions in the Registry of FITS Conventions, which
I intend to do soon.

One question, however, is whether both of these conventions have
actually been used. I know that the simpler convention, e.g.,

TFORMn = '120A20'

has been used (in this case, it means that the 120 character string
consists of 6 substrings that are each 20 characters long).

The other, more complex convention has 2 variations. The first form,
which is equivalent to the above example, is

TFORMn = '120A:SSTR20'

The other variation is

TFORMn = '120A:SSTR20/032'

which signifies that the 120 character field consists of variable-length
substrings where each substring has a maximum length of 20 characters
and is terminated by the ASCII character 32 (which happens to be a space
character).

Does anyone know whether this more complex convention has been used in
any real FITS files? If so, I'd like to get an example file.

Bill
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Dr. William Pence
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Greenbelt MD 20771 +1-301-286-1684 (fax)


 




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