Combined dendritic/deranged terrain processing

AlexanderVentura — Tue, 12 Feb 2019 09:05:31 GMT

Hello,

I am following the following workflow described in ESRI's document "Overview of Arc Hydro Terrain Preprocessing Workflows":

Use case 6: Combined dendritic/deranged terrain with known sink and stream locations (using user specified streams) - this needs to be verified on Iceland dataset

1) Create Drainage Line Structures.
2) DEM Reconditioning.
3) Create Sink Structures.
4) Level DEM.
5) Fill Sinks.
6) Flow Direction.
7) Adjust Flow Direction in Sinks.
😎 Adjust Flow Direction in Streams.
9) Adjust Flow Direction in Lakes (optional).
10) Sink Watershed Delineation.
11) Combine Stream Link and Sink Link.
12) Catchment Grid Delineation.
13) Catchment Polygon Processing.
14) Adjoint Catchment Processing.
15) Append Coastal Catchments.
16) Assign CatType Attribute to Catchment FC (optional).

My question is: what exactly does the "Level DEM" step (step 4) achieve? Could you please confirm that the DEM I should use as input here is the AgreeDEM created in step 2 (although the level DEM seems to want a "Raw DEM" as input). I don't understand why I would first generate an AgreeDEM and then use a raw DEM in the Level DEM step.

Any clarifications are greatly appreciated.

Thanks a lot,

Alex.

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Combined dendritic/deranged terrain processing