Elevation Derivatives for National Applications (EDNA)

Methodology

The development of the EDNA database is proceeding in three stages

Filter Total Items: 5
Date published: December 18, 2018
Status: Active

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...

Contacts: Sandra Poppenga
Date published: December 18, 2018
Status: Active

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...

Contacts: Sandra Poppenga
Date published: December 18, 2018
Status: Active

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...

Contacts: Sandra Poppenga
Date published: December 18, 2018
Status: Active

EDNA Stage 1 Blind Pass Processing Steps

Using well-tested GIS techniques, the NED database is being processed into a Stage 1 EDNA product. The bulk of this work is being done by the National Weather Service's Severe Storms Laboratory (NSSL) in Norman, Oklahoma. Additional processing is currently being provided by the USGS WRD office in Sacramento, California.

Contacts: Sandra Poppenga
Date published: December 18, 2018
Status: Active

EDNA Methodology

The development of the EDNA database is proceeding in three stages:

Contacts: Sandra Poppenga