Hi Ken, So, if I understand, that seems pretty simple and could be done with r.mapcalc:
diff = elev - outlet_elev where elev is a raster map of elevations and outlet_elev is the elevation at the basin outlet. Using a basin mask the calculation could be confined to any basin of interest. But, I am probably missing something, I think… Tom On Tue, Dec 15, 2020 at 2:51 PM Ken Mankoff <[email protected]> wrote: > Hi Thomas, > > On 2020-12-15 at 11:34 -08, Thomas Adams <[email protected]> wrote... > > What exactly do you mean by elevation drop (at each cell)? I can only > guess… > > I meant the change in each cell between their elevation and the elevation > of the associated hydrologic outlet cell. > > I actually need to query a different raster than change in elevation, but > it seems like I can pass any cost surface I want as the elevation parameter > to r.stream.distance and it works. I think it uses the input direction > raster to calculate the outlet for each source, then queries the input and > output "elevation" raster (in my case some other cost surface), regardless > of what those values represent. > > -k. > > -- Thomas E Adams, III 1724 Sage Lane Blacksburg, VA 24060 [email protected] (personal) [email protected] (work) 1 (513) 739-9512 (cell)
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