alm2map_cxx.cc

00001 /*
00002  *  This file is part of Healpix_cxx.
00003  *
00004  *  Healpix_cxx is free software; you can redistribute it and/or modify
00005  *  it under the terms of the GNU General Public License as published by
00006  *  the Free Software Foundation; either version 2 of the License, or
00007  *  (at your option) any later version.
00008  *
00009  *  Healpix_cxx is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU General Public License
00015  *  along with Healpix_cxx; if not, write to the Free Software
00016  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00017  *
00018  *  For more information about HEALPix, see http://healpix.jpl.nasa.gov
00019  */
00020 
00021 /*
00022  *  Healpix_cxx is being developed at the Max-Planck-Institut fuer Astrophysik
00023  *  and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
00024  *  (DLR).
00025  */
00026 
00027 /*
00028  *  Copyright (C) 2003, 2004, 2005 Max-Planck-Society
00029  *  Author: Martin Reinecke
00030  */
00031 
00032 #include "xcomplex.h"
00033 #include "cxxutils.h"
00034 #include "paramfile.h"
00035 #include "simparams.h"
00036 #include "healpix_data_io.h"
00037 #include "alm.h"
00038 #include "alm_fitsio.h"
00039 #include "healpix_map.h"
00040 #include "healpix_map_fitsio.h"
00041 #include "alm_healpix_tools.h"
00042 #include "alm_powspec_tools.h"
00043 #include "fitshandle.h"
00044 
00045 using namespace std;
00046 
00047 template<typename T> void alm2map_cxx (paramfile &params, simparams &par)
00048   {
00049   par.add_comment("-----------------------");
00050   par.add_comment(" ** alm2map_cxx 1.0 **");
00051   par.add_comment("-----------------------");
00052 
00053   int nlmax = params.template find<int>("nlmax");
00054   par.add("nlmax","NLMAX",nlmax,"maximum l of the alms");
00055   int nmmax = params.template find<int>("nmmax",nlmax);
00056   par.add("nmmax","NMMAX",nmmax,"maximum m of the alms");
00057   planck_assert(nmmax<=nlmax,"nmmax must not be larger than nlmax");
00058   string infile = params.template find<string>("infile");
00059   par.add_source_file (infile, 2);
00060   string outfile = params.template find<string>("outfile");
00061   int nside = params.template find<int>("nside");
00062   double fwhm_arcmin = params.template find<double>("fwhm_arcmin",0);
00063 
00064   arr<double> temp, pol;
00065   get_pixwin (params,par,nlmax,nside,temp,pol);
00066 
00067   bool deriv = params.template find<bool>("derivatives",false);
00068   if (deriv)
00069     {
00070     Alm<xcomplex<T> > alm;
00071     read_Alm_from_fits(infile,alm,nlmax,nmmax,2);
00072     if (fwhm_arcmin>0) smooth_with_Gauss (alm, fwhm_arcmin);
00073     Healpix_Map<T> map(nside,RING,SET_NSIDE),
00074                    mapdth(nside,RING,SET_NSIDE),
00075                    mapdph(nside,RING,SET_NSIDE);
00076     alm.ScaleL(temp);
00077 
00078     double offset = alm(0,0).real()/sqrt(fourpi);
00079     alm(0,0) = 0;
00080     alm2map_der1(alm,map,mapdth,mapdph);
00081     for (int m=0; m<map.Npix(); ++m) map[m]+=offset;
00082     fitshandle out;
00083     out.create (outfile);
00084     write_Healpix_map_to_fits (out,map,mapdth,mapdph,FITSUTIL<T>::DTYPE);
00085     par.add_keys(out);
00086     return;
00087     }
00088 
00089   bool polarisation = params.template find<bool>("polarisation");
00090   if (!polarisation)
00091     {
00092     Alm<xcomplex<T> > alm;
00093     read_Alm_from_fits(infile,alm,nlmax,nmmax,2);
00094     if (fwhm_arcmin>0) smooth_with_Gauss (alm, fwhm_arcmin);
00095     Healpix_Map<T> map(nside,RING,SET_NSIDE);
00096     alm.ScaleL(temp);
00097 
00098     double offset = alm(0,0).real()/sqrt(fourpi);
00099     alm(0,0) = 0;
00100     alm2map(alm,map);
00101     map.add(offset);
00102     fitshandle out;
00103     out.create (outfile);
00104     write_Healpix_map_to_fits (out,map,FITSUTIL<T>::DTYPE);
00105     par.add_keys(out);
00106     }
00107   else
00108     {
00109     Alm<xcomplex<T> > almT, almG, almC;
00110     read_Alm_from_fits(infile,almT,nlmax,nmmax,2);
00111     read_Alm_from_fits(infile,almG,nlmax,nmmax,3);
00112     read_Alm_from_fits(infile,almC,nlmax,nmmax,4);
00113     if (fwhm_arcmin>0) smooth_with_Gauss (almT, almG, almC, fwhm_arcmin);
00114     Healpix_Map<T> mapT(nside,RING,SET_NSIDE), mapQ(nside,RING,SET_NSIDE),
00115                    mapU(nside,RING,SET_NSIDE);
00116     almT.ScaleL(temp);
00117     almG.ScaleL(pol); almC.ScaleL(pol);
00118 
00119     double offset = almT(0,0).real()/sqrt(fourpi);
00120     almT(0,0) = 0;
00121     alm2map_pol(almT,almG,almC,mapT,mapQ,mapU);
00122     mapT.add(offset);
00123     fitshandle out;
00124     out.create (outfile);
00125     write_Healpix_map_to_fits (out,mapT,mapQ,mapU,FITSUTIL<T>::DTYPE);
00126     par.add_keys(out);
00127     }
00128   }
00129 
00130 int main (int argc, const char **argv)
00131   {
00132 PLANCK_DIAGNOSIS_BEGIN
00133   module_startup ("alm2map_cxx", argc, argv, 2, "<parameter file>");
00134   paramfile params (argv[1]);
00135   simparams par;
00136 
00137   bool dp = params.find<bool> ("double_precision",false);
00138   dp ? alm2map_cxx<double>(params,par) : alm2map_cxx<float>(params,par);
00139 PLANCK_DIAGNOSIS_END
00140   }