Orfeo Toolbox  4.2
Projections/VectorDataExtractROIExample.cxx
/*=========================================================================
Program: ORFEO Toolbox
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
See OTBCopyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
// Software Guide : BeginLatex
//
// There is some vector data sets widely available on the internet. These data
// sets can be huge, covering an entire country, with hundreds of thousands
// objects.
//
// Most of the time, you won't be interested in the whole area and would like
// to focuss only on the area corresponding to your satellite image.
//
// The \doxygen{otb}{VectorDataExtractROI} is able to extract the area corresponding
// to your satellite image, even if the image is still in sensor geometry (provided
// the sensor model is supported by OTB). Let's see how we can do that.
//
// This example demonstrates the use of the
// \doxygen{otb}{VectorDataExtractROI}.
//
// Software Guide : EndLatex
#include "otbVectorData.h"
#include "otbImage.h"
int main(int argc, char* argv[])
{
if (argc < 4)
{
std::cout << argv[0] <<
" <input vector filename> <input image name> <output vector filename> "
<<
std::endl;
return EXIT_FAILURE;
}
const char * inVectorName = argv[1];
const char * inImageName = argv[2];
const char * outVectorName = argv[3];
typedef double Type;
typedef otb::VectorDataFileReader<VectorDataType> VectorDataFileReaderType;
typedef otb::VectorDataFileWriter<VectorDataType> VectorDataWriterType;
typedef otb::RemoteSensingRegion<Type> TypedRegion;
typedef otb::Image<unsigned char, 2> ImageType;
typedef otb::ImageFileReader<ImageType> ImageReaderType;
ImageReaderType::Pointer imageReader = ImageReaderType::New();
imageReader->SetFileName(inImageName);
imageReader->UpdateOutputInformation();
// Software Guide : BeginLatex
//
// After the usual declaration (you can check the source file for the details),
// we can declare the \doxygen{otb}{VectorDataExtractROI}:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
FilterType::Pointer filter = FilterType::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Then, we need to specify the region to extract. This region is a bit special as
// it contains also information related to its reference system (cartographic projection
// or sensor model projection). We retrieve all these information from the image
// we gave as an input.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
TypedRegion region;
TypedRegion::SizeType size;
TypedRegion::IndexType index;
size[0] = imageReader->GetOutput()->GetLargestPossibleRegion().GetSize()[0]
* imageReader->GetOutput()->GetSpacing()[0];
size[1] = imageReader->GetOutput()->GetLargestPossibleRegion().GetSize()[1]
* imageReader->GetOutput()->GetSpacing()[1];
index[0] = imageReader->GetOutput()->GetOrigin()[0]
- 0.5 * imageReader->GetOutput()->GetSpacing()[0];
index[1] = imageReader->GetOutput()->GetOrigin()[1]
- 0.5 * imageReader->GetOutput()->GetSpacing()[1];
region.SetSize(size);
region.SetOrigin(index);
imageReader->GetOutput()->GetMetaDataDictionary());
region.SetRegionProjection(
imageMetadataInterface->GetProjectionRef());
region.SetKeywordList(imageReader->GetOutput()->GetImageKeywordlist());
filter->SetRegion(region);
// Software Guide : EndCodeSnippet
VectorDataFileReaderType::Pointer reader = VectorDataFileReaderType::New();
VectorDataWriterType::Pointer writer = VectorDataWriterType::New();
reader->SetFileName(inVectorName);
writer->SetFileName(outVectorName);
// Software Guide : BeginLatex
//
// And finally, we can plug the filter in the pipeline:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
filter->SetInput(reader->GetOutput());
writer->SetInput(filter->GetOutput());
// Software Guide : EndCodeSnippet
writer->Update();
return EXIT_SUCCESS;
}

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