cerose85

Thoughts on Fill Sinks Issue: No Results, Sometimes Error

Discussion created by cerose85 on Mar 16, 2012
Latest reply on Mar 19, 2012 by MBoucher21
I'm working to create a depressionless DEM so that I can autodelineate watersheds based on it.

However, I'm a bit confused about the fill sinks process. I've been advised to just use the "fill sinks" tool in the ArcHydro toolbox, without regards to identifying or limiting the sinks. However, when I run this tool, either I get an error, or nothing at all happens, and no results are posted, and no new layer is created. What should I be seeing? I'm assuming it should fill all sinks since I didn't specify a threshold or create a deranged polygon. And I'm assuming after it fills sinks, it's supposed to at least create another layer, but I see nothing and nothing happens, unless I get an error, which is equally likely- it seems random.

I'm trying to use this as a model: http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Creating_a_depressionless_DEM , however it seems very out-dated in its terminology. For instance, it refers to the "Sink function" and the "Watershed function", whereas in my ArcHydro toolbox, I do not see anything like that. I see "Fill sinks", "sink evaluation", "sink prescreening", and "sink selection". Which of these do you think it's referring to?

By the way, here are some details about the data I'm working on, in case it will help:

I have 3 different raster layers that are DEMs- would I need to somehow merge them into one to make this work?
I did not recondition my DEM because I want to try first without burning the streams into the DEM (it's created from LiDAR).
Also I should note that I'm working out of the Toolbox rather than the ArcHydro Toolbar, which won't recognize any of my DEMs.

Any help would be greatly appreciated, thank you!

Claire

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