[gdal-dev] downsampling geotiff with a low-pass filter

[Marco]

Upsample to 1m, then downsample to 5?

On 15-11-18 12:06, Kay F. Jahnke wrote:
> Hi all!
>
> I have a very detailed GeoTIFF DEM of part of my target area (2m 
> resolution). The remainder of the area is covered in 5m. So I'd like 
> to downsample the moore detailed data to have everything in 5m for 
> further processing. The nearest thing to what I have in mind is using 
> -r average, but from signal processing theory I know that using a 
> simple average over a block of data is not a good approximation for a 
> low-pass filter. Also, since some of the source pixels are fully 
> inside the target pixels and some are only partly (5 doesn't divide by 
> 2), An average over all participating source pixels seems wrong. What 
> would you advise?
>
> With regards
> Kay
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