Provided by: montage_4.0+dfsg-3_amd64 
NAME
mMakeHdr - Create a FITS header template for use in mosaic creation
SYNOPSIS
MakeHdr [-d level] [-s statusfile] [-p(ixel-scale) cdelt] [-n] images.tbl template.hdr [system [equinox]]
DESCRIPTION
From a list of images to be mosaicked together, mMakeHdr generates the FITS header that best describes
the output image. If the input metadata represent a properly matched set of data cubes (three or four
dimensions), the header will reflect this and can be used in cube mosaicking. If the spatial coverage of
the data is large enough that a TAN projection header is infeasable, an allsky (AITOFF) header will be
created, though this should be used with caution as it can easily be the result of metadata for images
that shouldn't really be combined.
OPTIONS
-d level
Turns on debugging to the specified level (1-3).
-s statusfile
Output and errors are written to statusfile instead of to stdout.
-p cdelt
Specify a pixel scale for the header, if different from the input images
-n "North-aligned" flag. By default, the FITS header generated represents the best fit to the
images, often resulting in a slight rotation. If you want north to be straight up in your final
mosaic, you should use this flag.
ARGUMENTS
images.tbl
Metadata table (generated by mImgtbl) describing the images to be mosaicked.
template.hdr
Path to header template to be generated.
system (optional)
Specifies the system for the header (default is Equatorial). Possible values are:
EQUJ
EQUB
ECLJ
ECLB
GAL
SGAL
equinox (optional)
If a coordinate system is specified, the equinox can also be given in the form YYYY. Default is
J2000.
RESULT
Creation of output file template.hdr.
MESSAGES
OK [struct stat = "OK", count=nimages, ncube=ncubes, clon=ra, clat=dec, lonsize=crpix1,
latsize=crpix2, posang=ang, lon1=ra1, lat1=dec1, lon2=ra2, lat2=dec2, lon3=ra3, lat3=dec3,
lon4=ra4, lat4=dec4]
OK messages about projection and number of axes>
ERROR Memory allocation failure.
ERROR Invalid pixel scale string: cdelt
ERROR Cannot open status file: statusfile
ERROR Invalid system string. Must be EQUJ|EQUB|ECLJ|ECLB|GAL|SGAL
ERROR Equinox string is not a number
ERROR Can't open output header file.
ERROR Invalid image metadata file: filename
ERROR Need columns: ctype1 ctype2 nl ns crval1 crval2 crpix1 crpix2 cdelt1 cdelt2 crota2 (equinox
optional). Four corners (equatorial) will be used if they exist or even just a single set of
coordinates
ERROR Bad WCS for image n
ERROR Error computing boundaries.
ERROR Output wcsinit() failed.
EXAMPLES
$ mMakeHdr 2mass-images.tbl orig.hdr
[struct stat="OK", count=30]
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.
Due to some numerical approximation, the "North Up" bounding box calculated when the -n switch is on can
be skewed a fraction of a degree.
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.