Abstract:
The Elevation Derivatives for National Applications (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
The recent completion of the National Elevation Dataset (NED) and the National Hydrography Dataset (NHD) has provided an avenue for nation-wide development of topographically derived hydrologic data layers at a scale of 1:24,000. Some of the benefits of a nation-wide development of hydrologic derivatives can be summarized as:
-The development of the EDNA database would be responsive to the need for better drainage basin boundaries for the country. The new Watershed Boundaries Dataset (WBD) strives to identify the "best-available" watersheds boundaries available on a national level. The development of the WBD is a joint project of the Advisory Committee of Water Information and the Federal Geographic Data Committee. The existing 1:250,000-scale Cataloging Unit delineations, currently, the "best-available" watershed boundaries for the country, have proven inadequate for many regional or local-level studies. Development of the EDNA derived Cataloging Unit, Watershed and Subwatershed boundaries can be used to provide high-resolution boundaries for the WBD.
-Along with development of improved, although static, Cataloging Unit boundaries and subsequent subdivision of these units into Watershed and Subwatershed units, the EDNA database will provide the capability of developing drainage basin boundaries above any point within the U.S. All locations downstream from any point in the U.S. can also be readily determined using the EDNA derivative data layers. With this information available on a national scale, impacts of pollutant spills can be easily traced through the network, drainage areas above any point (not just terminal points of pre-defined watersheds) can be determined and watershed units downstream of a point-source discharge can be easily be identified.
-Development of the EDNA database will serve to integrate two of the USGS' key national database, the NED and the NHD. Enhancements to both databases will be expected as the quality control procedures used in the development of the EDNA provide feedback to both NED and NHD. The NHD will be further enhanced by consistency with the EDNA. Elevation-derived streamline and basin parameters can be transferred onto the NHD following conflation with the EDNA. This will provide valuable attributes useful in model parameterization.
[Summary provided by the USGS.]
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Description:
Sample Data: Elevation Derivatives for National Applications (EDNA) Upper Washita Cataloging Unit Processing Overview.
Dataset Originator/Creator:
U.S. Geological Survey (USGS), EROS Data Center
Dataset Title:
Elevation Derivatives for National Applications (EDNA)
Dataset Release Place:
Sioux Falls, SD
Dataset Publisher:
U.S. Geological Survey
Data Presentation Form:
raster and vector digital data
Online Resource:
http://edna.usgs.gov/
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, EROS Data Center, no warranty expressed or implied is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The USGS will warrant the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustments of credit must be made within 90 days from the date of this shipment from the ordering site.
Use Constraints
There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Name:
EROS CENTER Phone:
605-594-6151
Phone:
800-252-4547
Fax:
605-594-6589
Email:
lta at usgs.gov
Contact Address:
LTA Customer Services
U.S. Geological Survey
EROS Center
47914 252nd Street City:
Sioux Falls
Province or State:
SD
Postal Code:
57198-0001
Country:
USA
Distribution
Distribution_Media:
Online
Fees:
No fees
Personnel
EROS CENTER Role:
TECHNICAL CONTACT
Phone:
605-594-6151
Phone:
800-252-4547
Fax:
605-594-6589
Email:
lta at usgs.gov
Contact Address:
LTA Customer Services
U.S. Geological Survey
EROS Center
47914 252nd Street City:
Sioux Falls
Province or State:
SD
Postal Code:
57198-0001
Country:
USA
TYLER
B.
STEVENS Role:
DIF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
