Timeline for Negative values in r.watershed flow accumulation
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 9, 2017 at 22:15 | answer | added | Marco | timeline score: 3 | |
| Jun 4, 2016 at 19:54 | comment | added | giulio | Ok thanks, now I completed the flow acc elaboration. Seems that r.watershed is a very powerful tool, but I needed to control it better. Thanks a lot | |
| Jun 4, 2016 at 13:51 | comment | added | Micha | Not necessarily. Flow accumulation is negative when some of the flow comes from outside the current region. The neg value is just a reminder that the real flow accum would be larger if you had a larger DEM. But your basin could still be fully covered. The cells with neg flow accumulation could be small sub-basins at the edges, outside your basin of interest. | |
| Jun 4, 2016 at 9:23 | history | edited | underdark | CC BY-SA 3.0 |
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| Jun 4, 2016 at 7:03 | comment | added | giulio | Ok, thanks!, this has solved the problem! But I think this also means that my dem is too small for covering the whole basin, is it right? | |
| Jun 3, 2016 at 21:09 | comment | added | Steven Kay | if you look at the help it looks like flow accumulations can be negative. have you tried the -a option ('use positive flow accumulation even for likely underestimates')? | |
| Jun 3, 2016 at 17:15 | history | asked | giulio | CC BY-SA 3.0 |