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/*
* Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef otbVarSol_h
#define otbVarSol_h
#include "itkMacro.h"
#include "otbMath.h"
namespace otb
{
/** \class VarSol
* \brief VarSol operations.
*
* Call VarSol main function
*
* [1] Vermote, E., Tanre, D., Deuze, J., Herman, M., Morcette, J., 1997.
* Second simulation of the satellite signal in the solar spectrum, 6S: An overview.
* IEEE Transactions on Geoscience and Remote Sensing 35
* \ingroup Radiometry
*
*
* \ingroup OTBOpticalCalibration
*/
class ITK_EXPORT VarSol
{
public:
/** Call the varSol function*/
static double GetVarSol(const int day, const int month)
{
/* System generated locals */
double d__1;
/* Local variables */
int j;
double om;
/* calculation of the variability of the solar constant during the year. */
/* day is the number of the day in the month */
if (month <= 2)
j = (month - 1) * 31 + day;
else if (month > 8)
j = (month - 1) * 31 - (month - 2) / 2 - 2 + day;
else
j = (month - 1) * 31 - (month - 1) / 2 - 2 + day;
om = (double)(j - 4) * .9856 * CONST_PI_180;
/* Computing 2nd power */
d__1 = 1. - std::cos(om) * .01673;
return 1. / (d__1 * d__1);
}
};
} // end namespace otb
#endif
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