[gdal-dev] gdalbuildvrt Max Value / Pixel Function

[Daniel Baston]

Hi Abdul,

For the specific case of multiple rasters that share the same extent, the
next release of GDAL should have a replacement "gdal_calc" that would take
multiple inputs and write a VRT that applies an expression to those inputs
("max", in your case). In the meantime, I think your best option would be
to prepare the VRT yourself.

Dan

On Thu, Feb 13, 2025 at 3:12 PM Abdul Raheem Siddiqui via gdal-dev <
gdal-dev at lists.osgeo.org> wrote:

> Hello,
>
> I am looking for functionality to create a VRT of multiple rasters where
> the VRT pixel value is the maximum of underlying rasters pixel values.
>
> I found out that we have pixel functions
> https://lists.osgeo.org/pipermail/gdal-dev/2016-September/045134.html
> that we can add to VRTs to get this behavior but just checking to see if
> there is a direct way to specify this in gdalbuildvrt command line call or
> do one has to manually inject this in VRT xml.
>
> On the same note does the new gdaltileindex provide this functionality of
> selecting the max value for each pixel out of the box?
>
> Regards,
> Abdul Raheem Siddiqui
> ERT Inc.
>
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