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.