Le lundi 23 juin 2014 11:49:58, Oliver Eichler a écrit : > Hi > > I would like to read a region of a raster map and re-project the resulting > image on-the-fly before it is displayed. I had a look at the GDAL Warp API > tutorial. And I stumbled across GDALWarpRegionToBuffer() while reading the > header files. I had a look into the setup functions and found quite a > variety of GDALCreateGenImgProjTransformer1..3() or > GDALCreateReprojectionTransformer(). I have to admit that whole stuff > leaves me a bit clueless. > > Thus my question: > > Is there a tutorial or an open source project that does the same I want to > do (I parsed the code of QGis without success)?
Oliver, Yes, you can look at the Warp API tutorial : http://www.gdal.org/warptut.html The source code of the gdalwarp utility can also be a source of study. You can warp into a memory dataset (MEM driver) if your image is of reasonable size (fit into RAM) and don't want it to be serialized on disk. Another possibility is to warp into a VRT dataset (possibly in /vsimem/ special file system to avoid temporary file) if your dataset is of a bigger size. Best regards, Even -- Geospatial professional services http://even.rouault.free.fr/services.html _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
