NAME

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

SYNOPSIS

       mHdr  [-s  system]  [-e  equinox]  [-h  height] [-p pixsize] [-r rotation] [-t 2mass-band]
       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

       -t 2mass-band
              If the data is 2MASS, the correct MAGZP will be added to the header.

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.