Sounds to me like it has the incorrect datum set. E.g. it says it's NAD83 but in reality is NAD27.
On Tue, Dec 22, 2009 at 8:12 AM, NopMap <[email protected]> wrote: > > > Hi! > > I am building a map with several layers containing OSM geometry and > hillshading+contours. The rendering chain for the hillshading is > > SRTM GeoTiff -> gdal_merge -> gdal_warp -> hillshading.exe -> mapnik > > Now I have the problem that the hillshading and the geometry do not > quite match. It seems the hillshading is offset some constant distance > to the north and west. I suspect as the offset looks like some 100m that > this is a result of the sample size of the SRTM data and the particular > hillshading algorithm. > > Now I am looking for a way to correct this offset, so that optically the > shading rests in the expected position relative to the geometry. But I > don't > know how to do this. I have tried modifying the projections for gdal_warp > with some false northing, but the results always remains the same. > > Any idea on how to move the hillshading 100m to the south? > > thank you > > Nop > > > > -- > View this message in context: > http://n2.nabble.com/Which-tool-to-add-an-offset-tp4204322p4204322.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Craig Miller Geospatial Software Architect
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