I discovered the following in r.watershed/ram/slope_len.c where the
slope length is calculated given two cell positions in the raster.
if (r == dr)
res = window.ns_res;
else if (c == dc)
res = window.ew_res;
else
res = diag;
Here we are dealing with a cell given by coordinates (r,c) which flows
into another cell (dr,dc). So the code reads to me that if the two
cells are on the same row, add to the slope the map's North-South
resolution. Should it not be West-East since the slope is horizontal
rather than vertical and vice versa for the columns?
This seems like a bug to me and the code is taken from the latest snapshot.
Johan Sten
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