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               The Duchamp Source Finder
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Duchamp 1.0 -- an object finder for spectral-line data cubes
Copyright (C) 2006, Matthew Whiting, ATNF

Duchamp is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.

Duchamp is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with WCSLIB; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA

Correspondence concerning WCSLIB may be directed to:
   Internet email: matthew.whiting@atnf.csiro.au
   Postal address: Dr. Matthew Whiting
                   Australia Telescope National Facility, CSIRO
                   PO Box 76
                   Epping NSW 1710
                   AUSTRALIA
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Introduction
------------

Duchamp is a stand-alone program designed to find objects in
astronomical data cubes, particularly spectral-line observations. Its
features include a wavelet-based reconstruction technique for reducing
the noise in the cube (and thereby enhancing detectability of
sources), easy-to-use text-based interface, flexibility to control all
relevant parameters such as detection thresholds, and a useful range
of text- and graphics-based output.

Duchamp works on any FITS image using the CFITSIO package, and uses
Mark Calabretta's WCSLIB library to provide accurate position and
velocity information for all detected sources.


Obtaining and Building Duchamp
------------------------------

The Duchamp web page is at 
http://www.atnf.csiro.au/people/Matthew.Whiting/Duchamp
where you can download a gzipped tar archive of the source code.

Duchamp uses three main external libraries: pgplot, cfitsio and
wcslib. If you do not have the libraries, they can be downloaded from
the following locations: 
PGPlot -- http://www.astro.caltech.edu/~tjp/pgplot/ 
cfitsio -- http://heasarc.gsfc.nasa.gov/docs/software/fitsio/fitsio.html 
wcslib -- http://www.atnf.csiro.au/people/Mark.Calabretta/WCS/index.html

Duchamp can be built on Unix systems by typing:
 >  ./configure
 >  make
 >  make clean (optional -- to remove the object files from the src
                directory)

This way, configure should find all the necessary libraries, but if
the above-mentioned libraries have been installed in non-standard
locations, you can specify additional directories to look in. There
are separate options for library files (eg. libcpgplot.a) and header
files (eg. cpgplot.h).

For example, if wcslib had been installed in /home/mduchamp/wcslib,
there are two libraries that are likely to be in separate
subdirectories: C/ and pgsbox/. Each subdirectory needs to be searched
for library and header files, so one could build Duchamp by typing:
 >  ./configure LIBDIRS="/home/mduchamp/wcslib/C
/home/mduchamp/wcslib/pgsbox" INCDIRS="/home/mduchamp/wcslib/C
/home/mduchamp/wcslib/pgsbox"
And then just run make in the usual fashion:
 >  make


Using Duchamp
---------------

There are two possible ways to run Duchamp. The first is:

 >  Duchamp -f image.fits

where image.fits is the data cube to be searched. This method simply
uses the default values of all parameters.

The second method allows some determination of the parameter values by
the user. Type:

 >  Duchamp -p parameterFile 

where parameterFile is a file with the input parameters, including the
name of the cube you want to search. There are two example input files
included with the distribution. The smaller one, InputExample, shows
the typical parameters one might want to set. The large one,
InputComplete, lists all possible parameters that can be entered, and
a brief description of them. To get going quickly, just replace the
"your-file-here" in InputExample with your image name, and type 

 >  Duchamp -p InputExample

A User's Guide in the docs/ directory provides complete
documentation. It comes in both postscript and portable document
format (pdf -- note that this contains hyperlinks). This guide will
provide full descriptions of all parameters, and of all steps in the
execution of Duchamp.

Any questions, please contact me!

Author: 
  Matthew Whiting, Australia Telescope National Facility, June 2006
  Matthew.Whiting@csiro.au