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

[Frank Warmerdam]

Carsten,

gdal_rasterize definitely supports burning into existing files.

I'm not sure about the configuration of your raster -- some formats are not
updatable-in-place, but the limitation isn't in gdal_rasterize.

Best regards,
Frank

On Tue, Mar 19, 2024 at 8:42 AM Carsten Lockenkötter <
carsten.lockenkoetter at web.de> wrote:

> 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.
>>>
>>> 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
>>>
>>
>>
>> --
>>
>> ---------------------------------------+--------------------------------------
>> I set the clouds in motion - turn up   | Frank Warmerdam,
>> warmerdam at 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
>>
>

-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20240319/5ec96925/attachment-0001.htm>