NAME

       mPix2Coord - Output the sky location corresponding to a pixel coordinate

SYNOPSIS

       mPix2Coord [-d] template.hdr ixpix jypix

DESCRIPTION

       Takes  an  image  FITS  header  template  and  a  pixel  (x,y) coordinate, and outputs the
       corresponding sky location.  Newer mExamine can do the same and more for real image files.

OPTIONS

       -d     Print out additional debugging information

ARGUMENTS

       template.hdr
              ASCII header template describing the image (either a FITS image,  or  a  JPEG  file
              created from the FITS file)

       ixpix  X coordinate (pixel location) on image

       jypix  Y coordinate (pixel location) on image

RESULT

       [struct stat="OK", lon=ra, lat=dec]

       where ra, dec are the sky coordinates that correspond to the input pixel.

MESSAGES

       OK     [struct stat="OK", lon=ra, lat=dec]

       ERROR  Bad template: template.hdr

       ERROR  Output wcsinit() failed.

EXAMPLES

       To  find  out  what  the  coordinates  are  at  the  100,130  pixel on an image defined by
       template.hdr:

       $ mPix2Coord template.hdr 100 130
              [struct stat="OK", lon=0.027777, lat=0.036110]

BUGS

       The drizzle algorithm has been implemented but has not been tested in this release.

       If a header template contains  carriage  returns  (i.e.,  created/modified  on  a  Windows
       machine),  the cfitsio library will be unable to read it properly, resulting in the error:
       [struct stat="ERROR", status=207, msg="illegal character in keyword"]

       It is best for the background correction algorithms if the area described  in  the  header
       template  completely encloses all of the input images in their entirety. If parts of input
       images are "chopped off" by  the  header  template,  the  background  correction  will  be
       affected.  We  recommend  you  use  an expanded header for the reprojection and background
       modeling steps, returning to the originally desired header size for the final  coaddition.
       The default background matching assumes that there are no non-linear background variations
       in the individual images (and therefore in the  overlap  differences).  If  there  is  any
       uncertainty  in  this  regard, it is safer to turn on the "level only" background matching
       (the "-l" flag in mBgModel.

COPYRIGHT

       2001-2015 California Institute of Technology, Pasadena, California

       If your research  uses  Montage,  please  include  the  following  acknowledgement:  "This
       research  made use of Montage. It is funded by the National Science Foundation under Grant
       Number ACI-1440620, and was previously  funded  by  the  National  Aeronautics  and  Space
       Administration's  Earth Science Technology Office, Computation Technologies Project, under
       Cooperative Agreement Number  NCC5-626  between  NASA  and  the  California  Institute  of
       Technology."

       The  Montage  distribution  includes an adaptation of the MOPEX algorithm developed at the
       Spitzer Science Center.