Great video, thanks for the tutorial. I had the problem, that the flow direction toolbox returned 255 directions and the accumulation toolbox did not return logic results. I had to use the "fill" toolbox first on my DEM and after that it was a piece of cake 👍
Hi Jeff, I am getting the same issue you were having with very small watersheds. I am not sure what you changed to get the result in 16:40. Can you please explain? I have been stuck on this for a long time. Thanks!
Yea sometimes because the DEM may have errors in it, or your POR point may not be right on the stream, you will get those small one pixel watersheds. What I have found is that you will have to move the POR point slightly up or down the stream. Also make sure the POR point is right on the stream network line. You can use the snapping tool to make sure the point is on the stream line. I hope this helps. :)
Hi Jeff! Thank you so much for the great video! Im having trouble with the Flow Direction stopping at 98% and not getting anywhere (tried a couple times, waited 2,5 hours and still going). Any ideas?
You use the GIS software, specifically the classify tool to find all the cells with 100 or more other cells flowing into them. Or whatever number you want to use.
I have 2 questions here : 1. Can I use DTM file to create the flow direction? 2. Why I cannot compute the D8 flow direction type? It only show me black and white result
Does your DTM contain elevation data? Or is it simply a hillshade model. The D8 tool needs elevation to work. If it is elevation data try running the full tool on it first to eliminate any errors in it.
