man mHdr (1): 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.