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/*
* This file is part of the MOSCA library
* Copyright (C) 2002-2010 European Southern Observatory
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* extinction.cpp
*
* Created on: 2014 4 2
* Author: cgarcia
*/
#include <cmath>
#include <extinction.h>
mosca::extinction::extinction(const cpl_table * ext) :
m_gsl_acc(NULL), m_gsl_interp(NULL)
{
m_extinction = cpl_table_duplicate(ext);
cpl_table_cast_column(m_extinction, "WAVE", "WAVE_D", CPL_TYPE_DOUBLE);
cpl_table_cast_column(m_extinction, "EXTINCTION",
"EXTINCTION_D", CPL_TYPE_DOUBLE);
}
mosca::extinction::extinction(const mosca::extinction& other) :
m_gsl_acc(NULL), m_gsl_interp(NULL)
{
m_extinction = cpl_table_duplicate(other.m_extinction);
}
mosca::extinction::extinction() :
m_extinction(NULL), m_gsl_acc(NULL), m_gsl_interp(NULL)
{
}
//TODO: Create a copy operator (copy destructor is not trivial)
mosca::extinction::~extinction()
{
if(m_extinction != NULL)
cpl_table_delete(m_extinction);
if(m_gsl_interp != NULL)
{
gsl_interp_free (m_gsl_interp);
gsl_interp_accel_free (m_gsl_acc);
}
}
mosca::spectrum mosca::extinction::correct_spectrum
(const spectrum& spec, double airmass)
{
std::vector<double> flux = spec.flux();
std::vector<double> wave = spec.wave();
for(size_t i = 0; i < flux.size(); ++i)
{
double wavelength = wave[i];
double interp_ext = eval_at_wave(wavelength);
double ext_factor = std::pow(10., interp_ext*0.4*airmass);
double corrected_flux = flux[i]*ext_factor;
flux[i] = corrected_flux;
}
mosca::spectrum spec_corrected(flux, wave);
return spec_corrected;
}
double mosca::extinction::eval_at_wave(double wavelength)
{
if(m_extinction == NULL)
return 0.;
cpl_size npts = cpl_table_get_nrow(m_extinction);
double * wave =
cpl_table_get_data_double(m_extinction, "WAVE_D");
double * ext =
cpl_table_get_data_double(m_extinction, "EXTINCTION_D");
if(wavelength > wave[npts-1])
return ext[npts-1];
if(wavelength < wave[0])
return ext[0];
if(m_gsl_interp == NULL)
{
m_gsl_acc = gsl_interp_accel_alloc ();
m_gsl_interp = gsl_interp_alloc (gsl_interp_linear, npts);
gsl_interp_init (m_gsl_interp,wave, ext, npts);
}
double ext_at_wave =
gsl_interp_eval (m_gsl_interp, wave, ext, wavelength, m_gsl_acc);
return ext_at_wave;
}
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