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

[Even Rouault]

Why not just trying?

Demo:

$ gdal_create -outsize 10 10 -burn 255 test.tif -a_srs EPSG:4326 -a_ullr 
0 10 10 0
$ gdal_rasterize -burn 0 
'{"type":"Polygon","coordinates":[[[2,2],[2,4],[4,4],[4,2],[2,2]]]}' 
test.tif
$ gdal_translate test.tif /vsistdout/ -of aaigrid
ncols        10
nrows        10
xllcorner    0.000000000000
yllcorner    0.000000000000
cellsize     1.000000000000
255 255 255 255 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255
255 255 0 0 255 255 255 255 255 255
255 255 0 0 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255
255 255 255 255 255 255 255 255 255 255

That said, I've attempted to clarifiy it pe 
https://github.com/OSGeo/gdal/commit/4377ce22ec8d26b76760e8c1e4a9ffa2bd240b7d

Le 19/03/2024 à 13:42, Carsten Lockenkötter via gdal-dev a écrit :
> Hi Frank,
>
> I have read about gdal_rasterize but it seems it works a bit different 
> as i need it.
> Gdal_rasterize converts a vector layer to a raster layer with specific 
> dimensions and create a new file, like a mask.
> It could be work for me yes, because i publish the raster files as 
> image mosiac at the geoserver.
> Maybe the new "mask" file overlays on me original files and the 
> created wmts tiles of the geoserver could contain the mask.
>
> I will try it, but is there another option to burn the vectorlayer 
> into existing tiles?
>
> Regards,
> Carsten
> Am 19.03.24, 00:14 schrieb Frank Warmerdam <warmerdam at pobox.com>:
>
>     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 <http://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
>
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>
>
>     -- 
>     ---------------------------------------+--------------------------------------
>     I set the clouds in motion - turn up   | Frank Warmerdam,
>     warmerdam at pobox.com
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>
>
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