Provided by: montage-gridtools_5.0+dfsg-1_amd64 
NAME
mDAG - Create a Directed Acyclic Graph (DAG) for Pegasus
SYNOPSIS
mDAG survey band objstr width height cdelt workdir workurlbase [urlbase]
mDAG -h survey band hdrfile workdir workurlbase [urlbase]
DESCRIPTION
mDAG creates an XML-based Directed Acyclic Graph (DAG) that specifies "jobs" or Montage modules to be
run to produce a mosaic, "files" to be consumed or generated during processing (input, intermediate, and
output files), and "dependencies" between jobs and files that imply an order in which jobs should be run.
In this "abstract graph", logical names are assigned to jobs and files. The abstract graph is intended
to be an input to a job scheduler, such as Pegasus in the Chimera Virtual Data System.
OPTIONS
-h
Output mosaic is based on a header file rather than explicit object name (for location), sizes and
scale.
ARGUMENTS
survey
mDAG has custom code for dealing with surveys (e.g. DSS) where we know we have to use the slower
mProject module rather than mProjectPP.
band
mDAG also has custom code for the 2MASS survey where Montage scales the data to a project-
specified magnitude zero point by band (J,H,K).
objstr
Object name, resolved through NED/SIMBAD for sky location.
width/height
Size of the image in degrees.
cdelt
Pixel scale in degrees.
hdrfile
Instead of objstr, width, height, and cdelt the user an provide a pre-built FITS header.
workdir
There are a collection of files the processing will need ane which mDAG creates. The user needs
to create a location for this and give it to mDAG.
workurlbase
While working, some files in the workspace are accessed via URL. Again, this needs to be set up
by the user beforehand.
urlbase
Optionally, results can be made URL-accessible if this parameter is given.
RESULT
If successful, the workspace will be populated with severeal tables and with the "dag.xml" file to be
given to the workflow manager.
MESSAGES
ERROR Error opening debug file
ERROR Error opening header template file
ERROR Error opening big header template file
ERROR Error opening image list
ERROR Error opening working file list for write
ERROR Error opening working file list for read
ERROR Error opening parent list
ERROR Error opening sorted parent list
ERROR Bad template: file
ERROR Output wcsinit() failed.
ERROR general error message
ERROR No return message from object lookup.
ERROR Invalid location specification or object name.
ERROR Can't find RA in lookup return.
ERROR Can't find Dec in lookup return.
ERROR Couldn't find host hostname
ERROR Couldn't create socket()
ERROR, msg=
hostname: connect failed.
EXAMPLES
mDAG 2mass j m51 0.5 0.5 0.00277778 m51work http://montage-web.ipac.caltech.edu/workspace/m51 [struct stat="OK", id="20150904_095958_21631"]
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.