U.S. Department of the Interior U.S. Geological Survey Improved DEM Derivatives in the NHDPlus Version 2 Alan Rea Craig Johnston Richard Moore.

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Presentation transcript:

U.S. Department of the Interior U.S. Geological Survey Improved DEM Derivatives in the NHDPlus Version 2 Alan Rea Craig Johnston Richard Moore

DEM Derivatives included in NHDPlus Version 2  Flow direction grid  Flow accumulation grid  Catchment grid and shapefile  Catchment seed grid (rasterized NHD, sinks)  HydroDEM (burned and walled)  Filled areas grid (diagnostic)  fdrnull grid (for computing flowlength)

Burn Components used to create HydroDEM  BurnLineEvent (lines)  BurnWaterbody (polygons)  Sink (points—not directly in NHD)  Wall (lines)  LandSea (polygons)  BurnAddLine (lines not in NHD)  BurnAddWaterbody (polys not in NHD)

HydroDEM development  Process uses an AML called AGREE developed by University of Texas to “burn” NHD streams into the NED (NHDPlus V2 uses python and geoprocessing tools)  Needed since NHD streams do not always match the NED flowpaths – “DEM Flowpath Displacement”

Hydro Enforcement for streams: “ stream burning”

NED versus HydroDEM

NHDPlus Refinements  Further modified the DEM surface within waterbodies to create a “Bathymetric Gradient”  Version 2 also burned in all water bodies, even isolated ones  Catchments were generated for the NHD coastal reaches  Catchments also were generated for sinks in Version 2  Used VAA to enforce hydro stepping

Standard DEM flow paths

Flow paths with Bathymetric Gradient

Victoria Reservoir Michigan NHD Flowline FTYPE = Pipeline Catch Burn Attributes Catchment = N Burn = N

Sinks in NHDPlus V2  A sink causes the raster representation of flow to stop  Actually created by inserting a NODATA cell in the HydroDEM grid  There are many more sinks in NHDPlus V2 than there were in V1  Sinks inserted wherever streams stop

Sink Examples

Summary  Burned and walled HydroDEM and derivatives  Improvements to the flow direction grids  Improved input data (especially WBD)  Many more sinks than V1  Catchments generated for sinks  HydroDEM and Burn Components included in distribution

Questions?