[GRASS-user] Upscaling an elevation model

[Nikos Alexandris]

Dear "elevation" experts,

I am looking for ways to upscale a 5m resolution elevation model.  The
upscaled models will be subjected to a series of trials using
`r.watershed`.  Derivative products will be inputs for soil erosion modelling.

In our wiki page about Interpolation [0], `r.resamp.stats` [1] is
presented as the only tool to resample a raster map to a coarser grid.
However, `r.resamp.rst` [2] also performs resampling to a lower
resolution.

[0] https://grasswiki.osgeo.org/wiki/Interpolation
[1] https://grass.osgeo.org/grass76/manuals/r.resamp.stats.html
[2] https://grass.osgeo.org/grass76/manuals/r.resamp.rst.html

While the target is to somewhat maintain "geomorphometric consistency"
across the different (coarser) scales, which tool is recommended?
For `r.resamp.stats`, would you recommend a resampling method other than
'average'?

Thank you, Nikos