Dear GRASS GIS community,
trying to compute the HAND model: Nobre A. D., 2001 http://dx.doi.org/10.1016/j.jhydrol.2011.03.051 i'd like to get pixels from 0 to 2 meters higher than the stream pixel they flow in (hoping i haven't missed any point in these papers). I used r.stream.distance difference=elevation_from_stream with r.mapcalc 'hand = elevation_from_stream < 2' Comparing to a previous output computed using ArcGIS, differences appear. Is it assumed that elevation difference is computed from the stream pixel a pixel flows in (i.e following flow direction map)? Or, is it in relation to the closest stream pixel ("as the crow flies" distance)? Would there be a difference providing the r.fill.dir output flow direction map instead of the r.watershed one? Many thanks in advance, regards, Adrien
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