[mapserver-users] Raster Upsampling

[Patrick Young]

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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