[AstroPy] AstroLibWCS & AstroLibCoords
stephen.walton at csun.edu
Thu Apr 21 09:25:42 CDT 2005
Perry Greenfield wrote:
> On Apr 20, 2005, at 9:53 AM, Alexandre Beelen wrote:
>> I was also thinking to wrap the WCSLIB  using swig or something else,
>> does any of you tried this before ?
> We've done that too. If you are interested we can make the wrappers
> available. We decided to see if was just as easy to re-implement and
> use wcslib for test comparisons. (And it turns out, that much of the
> complexity of handling FITS WCS headers is not really handled by
> wcslib; it basically presumes you have extracted the necessary set of
> keywords for its use (if I recall correctly).
This is not as true as it used to be. From a March 18 posting by
William Pence to the fitswcs discussion group:
>1. call the fits_hdr2str routine in CFITSIO to read the image header
>keywords into a long character string variable.
>2. pass this string variable to the wscpih routine in WCSLIB, which then
>parses all the WCS keywords and creates internal structures that will be
>used in subsequent transforms between pixel and world coordinates.
>3. call the wcsp2s routine in WCSLIB to convert any input pixel coordinate
>into world coordinates.
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