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EDNA is a multi-layered database derived from a version of the National Elevation Dataset (NED), which has been hydrologically conditioned for improved hydrologic flow representation.
The seamless EDNA database provides 30 meters resolution raster and vector data layers including:
Aspect
Contours
Filled DEM
Flow Accumulation
Flow Direction
Reach Catchment Seedpoints
Reach Catchments
Shaded Relief
Sinks
Slope
Synthetic Streamlines
Hydrologically conditioned elevation data, systematically and consistently processed to create hydrologic derivatives,can be useful in many topologically based visualization and investigative applications. Drainage areas upstream or downstream from any location can be accurately traced facilitating flood analysis investigations, pollution studies, and hydroelectric power generation projects.