[gdal-dev] C# Bindings warp image using gcp

[Edi.Karadumi]

Hello im trying to warp an image using 4 or more gcp points. I have already
done it in c++, but my project is in c# so im trying to convert it. I got
the following example from the GDAL warp API tutorial and adjusted it for my
needs. I have done most of the other parts but i cant convert the following
part

// Establish reprojection transformer. 

    psWarpOptions->pTransformerArg = 
        GDALCreateGenImgProjTransformer( hSrcDS, 
                                         GDALGetProjectionRef(hSrcDS), 
                                         hDstDS,
                                         GDALGetProjectionRef(hDstDS), 
                                         TRUE, 0.0, 1 );
    psWarpOptions->pfnTransformer = GDALGenImgProjTransform;

I cant find GDALCreateGenImgProjTransformer to create the transformer. How
can i adapt it i C#?

Best Regards
Edi Karadumi






This is the official Example

#include "gdalwarper.h"

int main()
{
    GDALDatasetH  hSrcDS, hDstDS;

    // Open input and output files. 

    GDALAllRegister();

    hSrcDS = GDALOpen( "in.tif", GA_ReadOnly );
    hDstDS = GDALOpen( "out.tif", GA_Update );

    // Setup warp options. 
    
    GDALWarpOptions *psWarpOptions = GDALCreateWarpOptions();

    psWarpOptions->hSrcDS = hSrcDS;
    psWarpOptions->hDstDS = hDstDS;

    psWarpOptions->nBandCount = 1;
    psWarpOptions->panSrcBands = 
        (int *) CPLMalloc(sizeof(int) * psWarpOptions->nBandCount );
    psWarpOptions->panSrcBands[0] = 1;
    psWarpOptions->panDstBands = 
        (int *) CPLMalloc(sizeof(int) * psWarpOptions->nBandCount );
    psWarpOptions->panDstBands[0] = 1;

    psWarpOptions->pfnProgress = GDALTermProgress;   

    // Establish reprojection transformer. 

    psWarpOptions->pTransformerArg = 
        GDALCreateGenImgProjTransformer( hSrcDS, 
                                         GDALGetProjectionRef(hSrcDS), 
                                         hDstDS,
                                         GDALGetProjectionRef(hDstDS), 
                                         FALSE, 0.0, 1 );
    psWarpOptions->pfnTransformer = GDALGenImgProjTransform;

    // Initialize and execute the warp operation. 

    GDALWarpOperation oOperation;

    oOperation.Initialize( psWarpOptions );
    oOperation.ChunkAndWarpImage( 0, 0, 
                                  GDALGetRasterXSize( hDstDS ), 
                                  GDALGetRasterYSize( hDstDS ) );

    GDALDestroyGenImgProjTransformer( psWarpOptions->pTransformerArg );
    GDALDestroyWarpOptions( psWarpOptions );

    GDALClose( hDstDS );
    GDALClose( hSrcDS );

    return 0;
}

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