Elevation Derivatives for National Applications (EDNA)
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.
Publications
Elevation derivatives for national applications
The Elevation Derivatives for National Applications (EDNA) project is a multi-agency effort to develop standard topographically derived layers for use in hydrologic and environmental modeling. The EDNA takes advantage of the seamless and filtered characteristics for the National Elevation Dataset (NED) to create a hydrologically conditioned Digital Elevation Model (DEM) useful for modeling applica
Science
EDNA Stage 1B Seamless Process
The EDNA Stage1B process involves collecting the raw data from the EDNA cooperators, performing QA/QC checks on the raw data, and preparing the data for Stage II of the project. ArcInfo amls are executed to create the seamless database, and ArcView tools are utilized to determine seamless accuracy. The Stage 1B database development provides seamless drainage basin delineations and synthetic...
EDNA Stage 3 Processing Steps (Conflation)
The results from the Stage 2 delineation will be incorporated into the EDNA development process. Drainage basin areas and synthetic streamline locations found to be in error at Stage 2 will be reanalyzed and, if necessary, the DEM will be reprocessed to ensure that the newly derived streamlines and basin boundaries are consistent with those developed in Stage 2. Delineations derived in this...
EDNA Stage 2 Vector Editing
The delineations produced in Stage 1 are passed on to appropriate cooperators, who will provide an intensive QA/QC. The derived watersheds will be overlain on 1:24,000 map sheets (as DRGs) and the watershed boundaries will be revised using standard vector editing techniques. These revised boundaries will provide the Stage 2 delineation. Watershed areas found to be in conflict with the DRGs will be...