[mapserver-users] Raster Upsampling

[Patrick Young]

As a quick follow up, a hack that worked to get around this was to make a
VRT of the low resolution dataset wherein I set the resampling to bilinear
in the VRT and set the resolution to much much higher, and that has the
desired effect.  So the question is, is there a better way to achieve the
same thing in mapserver.

Thanks!

On Fri, Sep 10, 2021 at 10:17 AM Patrick Young <
patrick.mckendree.young at gmail.com> wrote:

> Hello!
>
> I was curious if it is possible to have mapserver bilinearly upsample a
> low resolution raster to a higher resolution when there is no reprojection
> required.
>
> My setup is that I have a very low resolution image (a bathymetric layer)
> and a much higher resolution image (aerial), both in web mercator.  When I
> request a high resolution XYZ tile, the low resolution image remains
> pixelated (it looks as if its is nearest neighbor upsampled) at the
> raster's native resolution even though I have set in the PROCESSING
> directive RESAMPLE=BILINEAR.
>
> I suspect from the docs that RESAMPLE only comes into play when we're
> doing on-the-fly reprojection, is that correct?  When no reprojection is
> required, but just simpler upsampling, can one change the kernel used?
>
> Many thanks!
> Patrick
>
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