Wim, I have remove the comment you quoted. It is from the distant past. What you should understand is that this isn't the *only* way to express georeferencing for GDAL images. You can also use Ground Control Points, RPCs and geolocation arrays. However GeoTransforms are the most common way and sufficient for many situations.
Is the relationship between your images and geographic (lat/long) coordinate space affine? If so, a geotransform will do just fine. (ie. is the pixel spacing uniform over the image in terms of decimal degrees) Best regards, Frank On Tue, Apr 23, 2013 at 4:37 AM, Wim de Vries <wsvr...@xs4all.nl> wrote: > Hi, > I want to go from x,y (pixels) to lon,lat and vice versa, using geotiffs. > I have found the > GetGeoTransform()<http://www.gdal.org/classGDALDataset.html#af9593cc241e7d140f5f3c4798a43a668>function, > but the documentations says: > > "NOTE: > GetGeoTransform()<http://www.gdal.org/classGDALDataset.html#af9593cc241e7d140f5f3c4798a43a668>isn't > expressive enough to handle the variety of OGC Grid Coverages > pixel/line to projection transformation schemes. Eventually this method > will be depreciated in favour of a more general scheme." > > I googled a lot, but cannot find out what is meant exactly by "OGC Grid > Coverages". I am just working with a simple cartesian x,y grid. > > Anyone willing to explain a bit more. > Thanks. > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Software Developer
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