Orfeo Toolbox  4.0
Projections/VectorDataProjectionExample.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
//
// Let's assume that you have a KML file (hence in geographical coordinates)
// that you would like to superpose to some image with a specific map projection.
// Of course, you could use the handy ogr2ogr tool to do that, but it won't
// integrate so seamlessly into your OTB application.
//
// You can also suppose that the image on which you want to superpose
// the data is not in a specific map projection but a raw image from a
// particular sensor. Thanks to OTB, the same code below will be able
// to do the appropriate conversion.
//
// This example demonstrates the use of the
// \doxygen{otb}{VectorDataProjectionFilter}.
//
// 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;
}
// Software Guide : BeginLatex
//
// Declare the vector data type that you would like to use in your
// application.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef otb::VectorData<double> InputVectorDataType;
typedef otb::VectorData<double> OutputVectorDataType;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Declare and instantiate the vector data reader:
// \doxygen{otb}{VectorDataFileReader}. The call to the
// \code{UpdateOutputInformation()} method fill up the header information.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
VectorDataFileReaderType;
VectorDataFileReaderType::Pointer reader = VectorDataFileReaderType::New();
reader->SetFileName(argv[1]);
reader->UpdateOutputInformation();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// We need the image only to retrieve its projection information,
// i.e. map projection or sensor model parameters. Hence, the image
// pixels won't be read, only the header information using the
// \code{UpdateOutputInformation()} method.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef otb::ImageFileReader<ImageType> ImageReaderType;
ImageReaderType::Pointer imageReader = ImageReaderType::New();
imageReader->SetFileName(argv[2]);
imageReader->UpdateOutputInformation();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The \doxygen{otb}{VectorDataProjectionFilter} will do the work of
// converting the vector data coordinates. It is usually a good idea
// to use it when you design applications reading or saving vector
// data.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef otb::VectorDataProjectionFilter<InputVectorDataType,
OutputVectorDataType>
VectorDataFilterType;
VectorDataFilterType::Pointer vectorDataProjection =
VectorDataFilterType::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Information concerning the original projection of the vector data
// will be automatically retrieved from the metadata. Nothing else
// is needed from you:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
vectorDataProjection->SetInput(reader->GetOutput());
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Information about the target projection is retrieved directly from
// the image:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
vectorDataProjection->SetOutputKeywordList(
imageReader->GetOutput()->GetImageKeywordlist());
vectorDataProjection->SetOutputOrigin(
imageReader->GetOutput()->GetOrigin());
vectorDataProjection->SetOutputSpacing(
imageReader->GetOutput()->GetSpacing());
vectorDataProjection->SetOutputProjectionRef(
imageReader->GetOutput()->GetProjectionRef());
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Finally, the result is saved into a new vector file.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
VectorDataFileWriterType;
VectorDataFileWriterType::Pointer writer = VectorDataFileWriterType::New();
writer->SetFileName(argv[3]);
writer->SetInput(vectorDataProjection->GetOutput());
writer->Update();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// It is worth noting that none of this code is specific to the
// vector data format. Whether you pass a shapefile, or a KML file,
// the correct driver will be automatically instantiated.
//
// Software Guide : EndLatex
return EXIT_SUCCESS;
}

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