私はオンラインのwatershedツールを使ってwatershedを特定しています。とてもよく機能しますが、私が選択した場所からポアポイントがずれています。なぜポアポイントがずれるのでしょうか、何か見落としているのでしょうか？<\/P><\/BODY><\/HTML>
OK, I figured it out. I used a snap distance of 30 which is the resolution of the data source I selected.
To be more specific, "The service will move points to be optimally located relative to the flows in the elevation model if they are not already there." You want the pour points to be on the nearest point of highest floe, or you will end up with tiny little watersheds.
I'm guessing it's because you have the Return Snapped Pour Points box checked.
Dave,
I would explore the snap distance parameters in the tool, here is the documentation: It should snap to the cell of highest accumulated flow and move the pour point to that location.
Watershed—ArcGIS REST API: Elevation Analysis services | ArcGIS for Developers
Thanks,
-Dan
Sorry, it is the arcgis on hydro.arcgis,com tool. See screenshot below. You can see the offset of the pour points in the lower left.
Could you be a little more specific about what online tool you are using? A link would be helpful....
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