[gdal-dev] Warping an image from C

Bborie Park bkpark at ucdavis.edu
Tue May 10 13:15:52 EDT 2011

Sorry Even.  Disregard my last message.  Thanks for your help.


On 05/05/2011 11:16 AM, Even Rouault wrote:
> Le mercredi 04 mai 2011 16:52:02, Bborie Park a écrit :
>> Hi,
>> I'm currently in the process of seeing what can be done to expose
>> GDAL's C warp functions to PostGIS Raster and am wondering if I have
>> hit a roadblock.
>> > From the docs for gdal_alg.h, it appears that the warp functionality
>> available is limited to GDALSimpleImageWarp and its limitations.  Is
>> this conclusion correct?  I did take a look at gdalwarpsimple.c
>> (https://svn.osgeo.org/gdal/trunk/gdal/apps/gdalwarpsimple.c) and it
>> appears to confirm my initial thoughts.
>> Are there any plans to expand the C warp API?  If not, would anyone
>> mind if I took a stab at it?
> I was going to answer : no, indeed there isn't any C warp API for the "full
> warping mode" (i.e. for what would be needed by the gdalwarp utility), because
> I know that gdalwarp.cpp (the source code of gdalwarp utility) use a few C++
> warp API, but I rechecked for confirmation and in alg/gdalwarper.h I can
> actually see :
> GDALWarpOperationH CPL_DLL GDALCreateWarpOperation(const GDALWarpOptions* );
> void CPL_DLL GDALDestroyWarpOperation( GDALWarpOperationH );
> CPLErr CPL_DLL GDALChunkAndWarpImage( GDALWarpOperationH, int, int, int, int
> );
> CPLErr CPL_DLL GDALChunkAndWarpMulti( GDALWarpOperationH, int, int, int, int
> );
> So I believe you can accomplish from C code all what gdalwarp does currently
> do. Do you need something else ?
>> Thanks,
>> Bborie

Bborie Park
Center for Vectorborne Diseases
UC Davis
bkpark at ucdavis.edu

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