/usr/include/OTB-6.4/otbGroundSpacingImageFunction.txx is in libotb-dev 6.4.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005-2017 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 otbGroundSpacingImageFunction_txx
#define otbGroundSpacingImageFunction_txx
#include "otbMath.h"
#include "itkConstNeighborhoodIterator.h"
#include "otbGroundSpacingImageFunction.h"
namespace otb
{
/**
* Constructor
*/
template <class TInputImage, class TCoordRep>
GroundSpacingImageFunction<TInputImage, TCoordRep>
::GroundSpacingImageFunction()
{
m_R = 6371000;
m_Deg2radCoef = CONST_PI / 180;
}
/**
*
*/
template <class TInputImage, class TCoordRep>
void
GroundSpacingImageFunction<TInputImage, TCoordRep>
::PrintSelf(std::ostream& os, itk::Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
}
/**
*
*/
template <class TInputImage, class TCoordRep>
typename GroundSpacingImageFunction<TInputImage, TCoordRep>
::FloatType
GroundSpacingImageFunction<TInputImage, TCoordRep>
::EvaluateAtIndex(const IndexType& index) const
{
FloatType var;
if (!this->GetInputImage())
{
var.Fill(itk::NumericTraits<ValueType>::min());
return var;
}
PointType point = this->GetPixelLocation(index);
IndexType indexSrcX, indexSrcY;
indexSrcX[0] =
static_cast<IndexValueType>(vcl_fabs(static_cast<ValueType>(this->GetInputImage()->GetLargestPossibleRegion().
GetSize()[0] -
index[0]))); // x position
indexSrcX[1] = index[1]; // y position
indexSrcY[0] = index[0]; // x position
indexSrcY[1] =
static_cast<IndexValueType>(vcl_fabs(static_cast<ValueType>(this->GetInputImage()->GetLargestPossibleRegion().
GetSize()[1] -
index[1])));
PointType pointSrcX = this->GetPixelLocation(indexSrcX);
PointType pointSrcY = this->GetPixelLocation(indexSrcY);
ValueType dLatX = (vcl_fabs(pointSrcX[1] - point[1])) * m_Deg2radCoef;
ValueType dLonX = (vcl_fabs(pointSrcX[0] - point[0])) * m_Deg2radCoef;
const ValueType One = itk::NumericTraits<ValueType>::One;
const ValueType Two = One + One;
ValueType aX = vcl_sin(dLatX / Two) * vcl_sin(dLatX / Two) + vcl_cos(point[1] * m_Deg2radCoef) * vcl_cos(
pointSrcX[1] * m_Deg2radCoef) * vcl_sin(dLonX / Two) * vcl_sin(dLonX / Two);
ValueType cX = Two * vcl_atan2(vcl_sqrt(aX), vcl_sqrt(One - aX));
ValueType dX = m_R * cX;
ValueType dLatY = (vcl_fabs(pointSrcY[1] - point[1])) * m_Deg2radCoef;
ValueType dLonY = (vcl_fabs(pointSrcY[0] - point[0])) * m_Deg2radCoef;
ValueType aY = vcl_sin(dLatY / Two) * vcl_sin(dLatY / Two) + vcl_cos(point[1] * m_Deg2radCoef) * vcl_cos(
pointSrcY[1] * m_Deg2radCoef) * vcl_sin(dLonY / Two) * vcl_sin(dLonY / Two);
ValueType cY = Two * vcl_atan2(vcl_sqrt(aY), vcl_sqrt(One - aY));
ValueType dY = m_R * cY;
//FloatType var;
var[0] = dX / (vcl_fabs(static_cast<ValueType>(indexSrcX[0] - index[0])));
var[1] = dY / (vcl_fabs(static_cast<ValueType>(indexSrcY[1] - index[1])));
return var;
}
template <class TInputImage, class TCoordRep>
typename GroundSpacingImageFunction<TInputImage, TCoordRep>
::PointType
GroundSpacingImageFunction<TInputImage, TCoordRep>
::GetPixelLocation(const IndexType& index) const
{
PointType inputPoint;
inputPoint[0] = index[0];
inputPoint[1] = index[1];
if (!this->GetInputImage())
{
itkExceptionMacro(<< "No input image!");
}
TransformType::Pointer transform = TransformType::New();
const itk::MetaDataDictionary& inputDict = this->GetInputImage()->GetMetaDataDictionary();
transform->SetInputDictionary(inputDict);
transform->SetInputOrigin(this->GetInputImage()->GetOrigin());
transform->SetInputSpacing(this->GetInputImage()->GetSignedSpacing());
transform->InstantiateTransform();
return transform->TransformPoint(inputPoint);
}
} // end namespace otb
#endif
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