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.