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astro/
sky2xy.pro
top source sky2xy
Astro
result = sky2xy(fitsfile, ra, dec, string=string, wcstoolsdir=wcstoolsdir)
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).
Return value
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.
Parameters
- fitsfile in
Name of FITS file that contains the WCS to use.
- ra in
Vector of right ascensions. Assumed to be in decimal degrees unless /STRING is set.
- dec in
Vector of declinations. Assumed to be in decimal degrees unless /STRING is set.
Keywords
- string in
If set, Ra and Dec are strings in HH:MM:SS, DD:MM:SS format.
- wcstoolsdir in
Path to the location of the binary sky2xy files in wcstools.
Author information
- History:
Written by: Jeremy Bailin 20 August 2010 Initial release 10 Feb 2011 Made WCSTOOLSDIR a keyword parameter.
File attributes
| Modification date: | Thu Feb 10 11:08:15 2011 |
| Lines: | 69 |