[110] | 1 | ----------------------------------------------------------------------- |
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| 2 | The Duchamp Source Finder |
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| 3 | ----------------------------------------------------------------------- |
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[166] | 4 | Duchamp 1.0.5 -- an object finder for spectral-line data cubes |
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[110] | 5 | Copyright (C) 2006, Matthew Whiting, ATNF |
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[3] | 6 | |
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[110] | 7 | Duchamp is free software; you can redistribute it and/or modify it |
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| 8 | under the terms of the GNU General Public License as published by the |
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| 9 | Free Software Foundation; either version 2 of the License, or (at your |
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| 10 | option) any later version. |
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[3] | 11 | |
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[110] | 12 | Duchamp is distributed in the hope that it will be useful, but WITHOUT |
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| 13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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| 14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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| 15 | for more details. |
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[3] | 16 | |
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[110] | 17 | You should have received a copy of the GNU General Public License |
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[146] | 18 | along with Duchamp; if not, write to the Free Software Foundation, |
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[110] | 19 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA |
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[3] | 20 | |
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[146] | 21 | Correspondence concerning Duchamp may be directed to: |
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[110] | 22 | Internet email: matthew.whiting@atnf.csiro.au |
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| 23 | Postal address: Dr. Matthew Whiting |
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| 24 | Australia Telescope National Facility, CSIRO |
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| 25 | PO Box 76 |
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| 26 | Epping NSW 1710 |
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| 27 | AUSTRALIA |
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| 28 | ----------------------------------------------------------------------- |
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[3] | 29 | |
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[110] | 30 | Introduction |
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| 31 | ------------ |
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[3] | 32 | |
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[110] | 33 | Duchamp is a stand-alone program designed to find objects in |
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| 34 | astronomical data cubes, particularly spectral-line observations. Its |
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| 35 | features include a wavelet-based reconstruction technique for reducing |
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| 36 | the noise in the cube (and thereby enhancing detectability of |
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| 37 | sources), easy-to-use text-based interface, flexibility to control all |
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| 38 | relevant parameters such as detection thresholds, and a useful range |
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| 39 | of text- and graphics-based output. |
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| 40 | |
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| 41 | Duchamp works on any FITS image using the CFITSIO package, and uses |
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| 42 | Mark Calabretta's WCSLIB library to provide accurate position and |
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| 43 | velocity information for all detected sources. |
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| 44 | |
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| 45 | |
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| 46 | Obtaining and Building Duchamp |
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| 47 | ------------------------------ |
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| 48 | |
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| 49 | The Duchamp web page is at |
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| 50 | http://www.atnf.csiro.au/people/Matthew.Whiting/Duchamp |
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| 51 | where you can download a gzipped tar archive of the source code. |
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| 52 | |
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[168] | 53 | Duchamp uses three main external libraries: pgplot, cfitsio (version |
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| 54 | 2.5 and greater, version 3+ preferred) and wcslib. If you do not have |
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| 55 | the libraries, they can be downloaded from the following locations: |
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| 56 | |
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[110] | 57 | PGPlot -- http://www.astro.caltech.edu/~tjp/pgplot/ |
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| 58 | cfitsio -- http://heasarc.gsfc.nasa.gov/docs/software/fitsio/fitsio.html |
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[8] | 59 | wcslib -- http://www.atnf.csiro.au/people/Mark.Calabretta/WCS/index.html |
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| 60 | |
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[154] | 61 | Duchamp can be built on Unix systems by typing (note that the terminal |
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| 62 | prompt here is represented by > -- don't type this character!): |
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[157] | 63 | |
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[110] | 64 | > ./configure |
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| 65 | > make |
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| 66 | > make clean (optional -- to remove the object files from the src |
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| 67 | directory) |
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[3] | 68 | |
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[110] | 69 | This way, configure should find all the necessary libraries, but if |
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| 70 | the above-mentioned libraries have been installed in non-standard |
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| 71 | locations, you can specify additional directories to look in. There |
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| 72 | are separate options for library files (eg. libcpgplot.a) and header |
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| 73 | files (eg. cpgplot.h). |
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| 74 | |
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[157] | 75 | For example, suppose wcslib had been locally installed in |
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| 76 | /home/mduchamp/wcslib. There will then be two libraries created that |
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| 77 | are likely to be in separate subdirectories: C/ and pgsbox/. Each |
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| 78 | subdirectory needs to be searched for library and header files, so one |
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| 79 | could build Duchamp by typing: |
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| 80 | |
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| 81 | > ./configure \ |
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| 82 | LIBDIRS="/home/mduchamp/wcslib/C /home/mduchamp/wcslib/pgsbox" \ |
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| 83 | INCDIRS="/home/mduchamp/wcslib/C /home/mduchamp/wcslib/pgsbox" |
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[110] | 84 | And then just run make in the usual fashion: |
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| 85 | > make |
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| 86 | |
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[154] | 87 | There is a script included in the distribution that allows you to make |
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[157] | 88 | sure Duchamp is running correctly. It will use a dummy FITS image in |
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| 89 | the verification/ directory -- this image has some Gaussian random |
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| 90 | noise, with five Gaussian sources present, plus a dummy WCS. The |
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| 91 | script runs Duchamp on this image with three different sets of inputs, |
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| 92 | and compares to known results, looking for differences and reporting |
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| 93 | any. There should be none reported if everything is working |
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[154] | 94 | correctly. To run, enter the command |
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[157] | 95 | |
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[154] | 96 | > VerifyDuchamp.sh |
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[110] | 97 | |
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[157] | 98 | You can also use the dummy image for your own testing if you like (for |
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| 99 | instance, testing different thresholds to get a feel for how the |
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| 100 | program works). |
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[154] | 101 | |
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[157] | 102 | |
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[110] | 103 | Using Duchamp |
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| 104 | --------------- |
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| 105 | |
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| 106 | There are two possible ways to run Duchamp. The first is: |
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| 107 | |
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| 108 | > Duchamp -f image.fits |
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| 109 | |
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| 110 | where image.fits is the data cube to be searched. This method simply |
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| 111 | uses the default values of all parameters. |
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| 112 | |
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| 113 | The second method allows some determination of the parameter values by |
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| 114 | the user. Type: |
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| 115 | |
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| 116 | > Duchamp -p parameterFile |
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| 117 | |
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[3] | 118 | where parameterFile is a file with the input parameters, including the |
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[110] | 119 | name of the cube you want to search. There are two example input files |
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| 120 | included with the distribution. The smaller one, InputExample, shows |
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| 121 | the typical parameters one might want to set. The large one, |
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| 122 | InputComplete, lists all possible parameters that can be entered, and |
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| 123 | a brief description of them. To get going quickly, just replace the |
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| 124 | "your-file-here" in InputExample with your image name, and type |
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[3] | 125 | |
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[110] | 126 | > Duchamp -p InputExample |
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[3] | 127 | |
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[110] | 128 | A User's Guide in the docs/ directory provides complete |
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| 129 | documentation. It comes in both postscript and portable document |
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| 130 | format (pdf -- note that this contains hyperlinks). This guide will |
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| 131 | provide full descriptions of all parameters, and of all steps in the |
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| 132 | execution of Duchamp. |
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[3] | 133 | |
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| 134 | Any questions, please contact me! |
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| 135 | |
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[110] | 136 | Author: |
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[166] | 137 | Matthew Whiting, Australia Telescope National Facility, September 2006 |
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[110] | 138 | Matthew.Whiting@csiro.au |
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[3] | 139 | |
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