[GRASS-user] Overlapping pixels among DEM tiles to compute the LS factor for RUSLE
Nikos Alexandris
nik at nikosalexandris.net
Fri Jan 25 07:18:32 PST 2019
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
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