Commit e990cbc2 authored by Emmanuel Christophe's avatar Emmanuel Christophe

DOC: TileMapImageIO

parent 335f2b2d
......@@ -25,6 +25,15 @@
// ${GeneratedFolder} 1.4835345 43.55968261 12
// Software Guide : EndCommandLineArgs
// Software Guide : BeginLatex
//
// First, we need to include several headers. There will be a bit of
// manual work going on here.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkRGBPixel.h"
#include "otbImage.h"
#include "otbImageFileReader.h"
......@@ -33,6 +42,7 @@
#include "otbExtractROI.h"
#include "otbImageFileWriter.h"
#include "ossim/projection/ossimTileMapModel.h"
// Software Guide : EndCodeSnippet
int main( int argc, char* argv[] )
{
......@@ -47,14 +57,40 @@ int main( int argc, char* argv[] )
}
// Software Guide : BeginLatex
//
// We retrieve the input parameters:
// \begin{itemize}
// \item the input filename is a simple text file specifying the access
// modality to open street map data;
// \item the output file is the image where you want to save the result;
// \item the cache directory is necessary to keep the data retrieved from
// the internet. It can also be reused to minimize network access;
// \item longitude of the center of the scene;
// \item latitude of the center of the scene;
// \item depth which is inversely related to the resolution: when you increase
// the depth by one, you divide the resolution by two.
// \end{itemize}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
char * inputFilename = argv[1];
char * outputFilename = argv[2];
char * cacheDirectory = argv[3];
double lon = atof(argv[4]);
double lat = atof(argv[5]);
int depth = atoi(argv[6]);
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// We now instanciate the reader. As some parameters need to be given to the
// IO which is an \doxygen{otb}{TileMapImageIO}, we need to manually create it also:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::RGBPixel<unsigned char> RGBPixelType;
typedef otb::Image<RGBPixelType, 2> ImageType;
typedef otb::ImageFileReader<ImageType> ReaderType;
......@@ -67,7 +103,22 @@ int main( int argc, char* argv[] )
readerTile->SetImageIO(tileIO);
readerTile->SetFileName(inputFilename);
readerTile->UpdateOutputInformation();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Now, we potentially have an image of several Peta-bytes covering the whole world
// in the reader
// that's why we don't want to do an update before extracting a specific
// area.
//
// The coordinates are refered with an origin at the north pole and the
// change date meridian in Mercator projection. So we need to translate the latitude
// and the longitude in this funny coordinate system:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef otb::InverseSensorModel<double> ModelType;
ModelType::Pointer model= ModelType::New();
......@@ -79,6 +130,7 @@ int main( int argc, char* argv[] )
return 1;
}
typedef itk::Point <double, 2> PointType;
PointType lonLatPoint;
lonLatPoint[0]=lon;
......@@ -86,7 +138,16 @@ int main( int argc, char* argv[] )
PointType tilePoint;
tilePoint=model->TransformPoint(lonLatPoint);
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// This enable us to use the \doxygen{otb}{ExtractROI} to retrieve only
// the area of interest and to avoid crashing our memory-limited computer.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
long int startX=static_cast<long int>(tilePoint[0]);
long int startY=static_cast<long int>(tilePoint[1]);
long int sizeX = 500;
......@@ -103,14 +164,40 @@ int main( int argc, char* argv[] )
extractROIOsmFilter->SetSizeY( sizeY );
extractROIOsmFilter->SetInput(readerTile->GetOutput());
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Finally, we just plug this to the writer to save our nice map of
// the area:
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef otb::ImageFileWriter<ImageType> WriterType;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName(outputFilename);
writer->SetInput(extractROIOsmFilter->GetOutput());
writer->Update();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Figure~\ref{fig:TILEMAPIMAGEIOEXAMPLE} shows the output images created from
// open street map data.
//
//
// \begin{figure}
// \center
// \includegraphics[width=0.70\textwidth]{openStreetMap.eps}
// \itkcaption[Open street map]{Map created from open street map at depth 12 near Toulouse}
// \label{fig:TILEMAPIMAGEIOEXAMPLE}
// \end{figure}
//
// If your street is missing, go and improve the map.
//
// Software Guide : EndLatex
return EXIT_SUCCESS;
......
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