[GRASS-user] Overlapping pixels among DEM tiles to compute the LS factor for RUSLE

[Nikos Alexandris]

A billion-pixel scaled DEM is the main input to compute the slope length
and steepness (LS) factor for RUSLE (`r.watershed`), only.

Tiling this DEM in tiles of 5K^2 pixels (`r.tile`), appears to be a reasonable
approach to parallelise this process.

I have no idea if an overlap among the different tiles is required (to
avoid border effects!?) and, if yes, how many pixels it should be.

Are there practical guidelines? Do I need to study the LS factor algorithm?
Is it something that analysts with experience in the domain can figure
out empirically?

Thank you, Nikos