topic Re: Creating a Depressionless DEM - Finding Sink Depth Problem in ArcGIS Spatial Analyst Questions

Creating a Depressionless DEM - Finding Sink Depth Problem

JohnKerkering1 — Sat, 21 Jan 2012 21:11:16 GMT

Hello,

My DEM (SRTM 90m) has sinks, as made clear by the output of the Flow Direction and Sink tools. I can fill these sinks with the Fill tool with no problem.

But I wanted to take a more precise approach by following the "Finding Sink Depth" process as outlined on the page, "Creating a Depressionless DEM". I followed each of the 5 steps outlined and determined that the maximum sink depth was 33 meters, as the output of the Minus tool ranged from 1 to 33.

I ran the Fill tool on the original DEM and specified a z-limit of 33 and then ran Flow Direction on this output. The Flow Direction output was the same as the Flow Direction output from the original, un-filled DEM. In other words, the "Finding Sink Depth" approach didn't work, unless I missed a step or made a mistake somewhere in there.

Anyone encounter a similar problem? Any thoughts or guidance would be most welcome.

Thanks.

Re: Creating a Depressionless DEM - Finding Sink Depth Problem

CharlesMorton — Sun, 05 Feb 2012 04:38:36 GMT

Were you able to resolve this issue? I am having problems with the Fill tool not changing values, but only when I set a z-limit value. Your issue may be related to this.
Charles

Re: Creating a Depressionless DEM - Finding Sink Depth Problem

WesKing — Tue, 07 Feb 2012 19:15:29 GMT

I believe this is still a bug that hasn't been fixed yet (at least the last I looked). See this thread...

http://forums.arcgis.com/threads/31888-Hydrology-Flow-Direction-tool-output-quot-incorrect-quot-when-setting-z-limit

Wes

Re: Creating a Depressionless DEM - Finding Sink Depth Problem

PavanYadav — Wed, 08 Feb 2012 16:00:54 GMT

I believe this is still a bug that hasn't been fixed yet (at least the last I looked). See this thread...

http://forums.arcgis.com/threads/31888-Hydrology-Flow-Direction-tool-output-quot-incorrect-quot-when-setting-z-limit

Wes

Hi All,
I have posted a comment on the above forum thread. In the above thread there is a discussion on a known bug (bug ID NIM069368). A fix for this bug is in our Service Pack 4 target list. SP 4 is planned to be available next month (March, 2012).

Thank you.
Pavan

Re: Creating a Depressionless DEM - Finding Sink Depth Problem

IlanHavinga — Wed, 22 Nov 2017 21:17:11 GMT

Hi Pavan,

Was this issue resolved? It appears I am having the same issue using ArcMap 10.5.1. Applying the maximum depth figure from the MINUS tool output as the z value in the Fill function only produces the same as running the Fill tool without it.

Thanks,

Ilan