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 <warmer...@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@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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