NAME

       mHdr - Connect to the IRSA service to create a header template

SYNOPSIS

       mHdr [-s system] [-e equinox] [-h height] [-p pixsize] [-r rotation] object|location width outfile

DESCRIPTION

       Connects  to  the  IRSA  service  HdrTemplate  to  create  a  header  template based on a location, size,
       resolution and rotation.

OPTIONS

       -s system

              Specify a coordinate system.  Can be one of:

                  "equatorial" or "eq" (default)
                  "ecliptic" or "ec"
                  "galactic" or "ga"
                  "supergalactic" or "sgal"

       -e equinox

              Specify an equinox.  Default is 2000.0

       -h height
              Height (y-axis) of area in degrees.  Default is equal to width

       -p pixsize
              Size of a pixel (in arcsec); default is 1

       -r rotation
              Rotation of image; default is 0

ARGUMENTS

       object|location
              Object string or coordinate location; should be in quotes if  there  are  any  spaces  or  special
              characters.

       width  Width (x-axis) of area

       outfile
              Path to output header template

RESULT

       [struct stat="OK", count=header-lines]

MESSAGES

       OK     [struct stat="OK", count=header-lines]

       ERROR  Can't open output file outfile

       ERROR  location parameter required

       ERROR  width parameter required

       ERROR  Invalid object/coordinates

       ERROR  Couldn't find host irsa.ipac.caltech.edu

       ERROR  Couldn't create socket

       ERROR  irsa.ipac.caltech.edu: connect failed

EXAMPLES

       If  a user wants to create a mosaic centered on m31, 1 degree on each side, the first step is to create a
       header template that describes the desired mosaic:

       mHdr "10.68469 +41.26904" 1 m31.hdr
              [struct stat="OK", count=16]

       Now m31.hdr can be used by other Montage modules to generate a mosaic.

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.

Montage 3.3                                         June 2010                                            MHDR(1)