This web site was copied prior to January 20, 2005. It is now a Federal record managed by the National Archives and Records Administration. External links, forms, and search boxes may not function within this collection. Learn more.   [hide]
Geography Discipline The National Map EROS Data Center EDNA
Link to the USGS Home Page

EDNA Catchments and Synthetic Streamlines 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.


EDNA bar
Please read this general Disclaimer
U.S. Department of the Interior | U. S. Geological Survey
National Mapping Division
EROS Data Center
Comments and Suggestions | Site Map
Last modified: December 2002