Name

       wcstools - Programs to access image world coordinate systems and catalogs

Setting an Image World Coordinate System

       imwcs  Automatically find stars in a FITS or IRAF image, match them to HST Guide USNO A or
              USNO UJ Stars, compute the relation between sky coordinates and image  coordinates,
              and write in in the image header. [after U of Iowa SETWCS]

       delwcs Delete  the  WCS  keywords  from  an  image. If both EPOCH and EQUINOX are present,
              EQUINOX is also deleted.

Using an Image World Coordinate System

       imcat  List catalog sources which should be found in the area of  the  sky  covered  by  a
              specific image.

       imsize Print center and size of image using WCS keywords in header

       imstar Find  and  list  the  n  brightest  stars  in an IRAF or FITS image, with their sky
              coordinates if there is WCS information in the image header.

       sky2xy Print image pixel coordinates for given sky coordinates on the command line or in a
              list file.

       xy2sky Print sky coordinates for given image pixel coordinates on the command line or in a
              list file.

Catalog Utility Programs

       scat   Search the HST GSC, USNO-A2.0, or other catalog given a region on the sky.

       skycoor
              Convert between J2000, B1950, and Galactic coordinates from the command line  or  a
              file.

Image Utility Programs

       addpix Add a constant value(s) to specified pixel(s)

       edhead Edit the header of a FITS file or the user parameters of an IRAF image file using a
              the text editor specified by the EDITOR environment variable.

       gethead
              Return values for keyword(s) specified after filename.

       getpix Return value(s) of specified pixel(s)

       i2f    Read two-dimensional IRAF image file and write FITS image file

       imhead Print FITS or IRAF header

       imrot  Rotate and/or reflect FITS or IRAF image files

       setpix Set specified pixel(s) to specified value(s)

       sethead
              Set header parameters in FITS or IRAF images.

       subpix Subtract a constant value(s) from specified pixel(s)

Author

       Doug Mink, SAO (dmink@cfa.harvard.edu)