[MapServer-dev] KernelFiltered outputformat?

[Seth G]

Hi Jukka,

Sounds interesting.
How would you envisage the Mapfile OUTPUTFORMAT looking in this case? Would it reference a VRT file ignoring any SourceFilename?

Seth

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On Tue, Apr 23, 2024, at 4:58 PM, Rahkonen Jukka via MapServer-dev wrote:
> Hi,
>  
> I was experimenting with GDAL VRT and KernelFilteredSource https://gdal.org/drivers/raster/vrt.html#kernelfilteredsource. My aim was to sharpen aeriel photos a bit for helping visual image interpretation. I was rather satisfied with the following that, I believe, is an unsharp mask filter https://en.wikipedia.org/wiki/Kernel_(image_processing). Excerpt from my VRT file:
>  
> <KernelFilteredSource>
>       <SourceFilename relativeToVRT="1">P4433H.tif</SourceFilename>
>       <SourceBand>3</SourceBand>
>       <Kernel normalized="1">
>                 <Size>5</Size>
>           <Coefs> -0.00390625 -0.015625 -0.0234375 -0.015625 -0.00390625 -0.015625 -0.0625 -0.09375 -0.0625 -0.015625 -0.0234375 -0.09375 1.859375 -0.09375 -0.0234375 -0.015625 -0.0625 -0.09375 -0.0625 -0.015625 -0.00390625 -0.015625 -0.0234375 -0.015625 -0.00390625 </Coefs>
>   </Kernel>
>  
> I tested the sharpened VRT with QGIS and it works well. Now I wonder if it could be possible to configure Mapserver to have KernelFiltered outputformats driven by GDAL and VRT. Derived bands might be useful as well. Any thoughts?
>  
> -Jukka Rahkonen-
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