Carsten, The gdal_rasterize command allows you to "burn in" polygons from an OGR supported datasource into an existing raster. If your raster is a 3 band RGB file, you could use --burn 100 150 200 to burn in the RGB value (100,150,200). This will only work if the raster format you are using supports update-in-place.
You would have to regenerate pyramids after this process -- they are not automatically updated by GDAL when the "base layer" is updated. Best regards, Frank On Mon, Mar 18, 2024 at 5:34 PM Carsten Lockenkötter via gdal-dev < gdal-dev@lists.osgeo.org> wrote: > Hi, > > > > is it possible to censor specific areas of an aerial image using GDAL? > > > > I have several smaller tiles that I've already transformed into my desired > coordinate system and generated internal pyramids. > > Subsequently, I would like to censor certain areas based on polygons > (e.g., from a shapefile or an Oracle DB) (coloring them grayish). > > Set the color must be done after transforming coordinatesystem and > generating pyramids. > > > > I usually use the compiled Windows binaries from gisinternals.com. > > Presumably, my plan doesn't work with that, right? At least I haven't > found anything in that direction. > > I suppose this could be done with a Python, but I've never worked with > Python before. > > Do I need to adjust the internal pyramids as well? Or do I have to > recreate them? > > > > Could you please show me a brief example of how it could work, so I have > an approach? > > I just need an idea of how to implement this and possibly some tips on > what else I need to consider. > > > > Regards, > > Carsten > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://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 | USA: +1 650-701-7823 <http://voice.google.com/calls?a=nc,%2B16507017823> and watch the world go round - Rush | CAN: +1 343-550-9984
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