[fitsbits] Re: [fitswcs] WCSLIB 3.3

[Doug Mink]

David Berry wrote:

> Just for completeness... the AST library (www.starlink.ac.uk/ast/) also
> handles CD (both CDi_j and CDiiijjj) and PC matrices (both PCi_j and
> PCiiijjj), and includes a parsing system (i.e. you give it an entire
> header, and it sucks out the bits it needs and gives you a pointer to
> an object representing all the WCS information in the header).

Since I didn't note it before, WCSTools also provides a single-call
parsing subroutine which ingests a FITS header and returns a WCS
structure or cascading WCS structures if the designated WCS depends
on others.  FITS reading software is also included--my FITS experience
predates CFITSIO--so there is another single subroutien call which
returns the WCS structure(s) given a FITS or IRAF .imh file name.

-Doug Mink