2
votes
How to resolve the watershed delineation failure in QGIS due to NO DATA values in 'Flow Direction File'?
The GRASS r.watershed has a few settings that may help. Check the "Enable Single Flow Direction" and the "Beautify flat areas":
I ran r.watershed with your DEM and these settings, ...
- 114
1
vote
Accepted
How to use Watershed tool in ArcPy
The watershed tool wants a feature layer as the second input, you are passing a tuple.
You could use the MakeFeatureLayer with a where_clause and an iterator to pass the pour points one at a time to ...
- 1,417
1
vote
Detect sharp changes in elevation
Use the slope tool in Arc with D8 or Dinf checked, and output set as degree. It will generate a raster which you can then threshold in your raster calculator. These sharp changes are likely above 85° ...
- 11
1
vote
Calculate intersect area for every feature in layer (ArcGIS Pro)
You can use the Intersect geoprocessing tool to create an area value for each overlapping polygon.
Then Dissolve the result on the watershed field, and include the option to get the sum of area for ...
- 3,090
1
vote
How to delineate watersheds in QGIS?
Circa 2023, you can use the Global Watersheds API to find the watershed upstream of a point based on its latitude and longitude coordinates. Instructions are here:
https://mghydro.com/watersheds/help....
- 96
1
vote
Delineating large scale watershed?
For those reading this post in 2023, there is a free online tool that can quickly delineate large watersheds using high-resolution data from MERIT-Hydro and MERIT-Basins:
Global Watersheds Web App: ...
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