Hydrology Flow Direction Tool results in stretch (not D8) when DEM is large

Hemlock_Grove — Fri, 19 Jan 2024 18:14:51 GMT

Hi,

While using the spatial analyst hydrology toolset on a DEM raster, I am finding that the output of the Flow Direction tool is a black and white stretch (with values outside the range of 1-128 as it should be for D8) when the DEM is 'large.'

If I clip the DEM (and I'm not sure of the threshold here or what it's based on-- small town size seems to work, county-wide is too large) it seems to work property with 8 distinct color classes.

I am filling the DEM prior to running the flow direction.

Any Ideas?

Re: Hydrology Flow Direction Tool results in stretch (not D8) when DEM is large

Oveys_Ziya — Tue, 23 Jul 2024 10:17:36 GMT

Hi,

I am facing the same problem. Were you able to solve this?

Thanks

topic Re: Hydrology Flow Direction Tool results in stretch (not D8) when DEM is large in ArcGIS Pro Questions

Hydrology Flow Direction Tool results in stretch (not D8) when DEM is large

Re: Hydrology Flow Direction Tool results in stretch (not D8) when DEM is large