createskymap.cpp
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/***************************************************************************
* createskymap.cpp - Create sky map *
* ----------------------------------------------------------------------- *
* copyright (C) 2013 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* This program 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 3 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>. *
* *
***************************************************************************/
/**
* @file createskymap.cpp
* @brief Create sky map
* @author Juergen Knoedlseder
*/
/* __ Includes ___________________________________________________________ */
#include "GammaLib.hpp"
/***********************************************************************//**
* @brief Create sky map
*
* This code illustrates the creation of a sky map.
***************************************************************************/
int main(void) {
// Create a SNR shell model. The shell is centred on RA=0.3 deg and
// Dec=0.1 deg. The shell has an inner radius of 0.5 deg and a width
// of 0.1 deg.
GSkyDir centre;
centre.radec_deg(0.3, 0.1);
GModelSpatialRadialShell model(centre, 0.5, 0.1);
// Create an empty sky map in celestial coordinates using a cartesian
// projection. The image is centred on RA=Dec=0, has a bin size of
// 0.01 degrees and 300 pixels in RA and Dec
double ra(0.0);
double dec(0.0);
double binsz(0.01);
int npix(300);
GSkymap image("CAR", "CEL", ra, dec, -binsz, binsz, npix, npix, 1);
// Fill the sky map with the model image
GEnergy energy; // Dummy (not relevant as model is not energy dependent)
GTime time; // Dummy (not relevant as model is not time dependent)
for (int index = 0; index < image.npix(); ++index) {
GSkyDir dir = image.inx2dir(index); // sky coordinate of pixel
double theta = centre.dist(dir); // distance in radians
image(index) = model.eval(theta, energy, time);
}
// Save the image to a FITS file
image.save("my_sky_map.fits", true);
// Exit
return 0;
}