[gdal-dev] Censor area in tiles of aerial image

[Frank Warmerdam]

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 at 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 at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/gdal-dev
>


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