Arc Hydro Terrain Processing

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Presentation transcript:

Arc Hydro Terrain Processing Exercise 3 Input Data HydroID Assignment

HydroID Assignment Used in this exercise Unused in this exercise Catchment HydroID = 535 to 654 (120 Catchments) DrainageLine HydroID = 655 to 774 (120 Drainage Lines) AdjointCatchment HydroID = 775 to 828 (54 Adjoint Catchments) DrainagePoint HydroID = 949 to 1068 (120 Drainage Points) HydroID is always unique – if you create a feature class and then delete it or overwrite it, HydroID’s are all assigned new

HydroID - DrainID HydroID of Catchment = DrainID of DrainageLine and DrainagePoint

NextDownID NextDownID = 549 NextDownID = 557 NextDownID = 549 NextDownID of a Catchment is HydroID of next downstream Catchment

Tracing by NextDownID Tracing Downstream Each catchment has only one downstream catchment (like a DEM cell)

Upstream Tracing using Next DownID