Glenn G. Kelly | USGS Science

USGS2002

Methods and tools for the development of hydrologically conditioned elevation data and derivatives for national applications

The National Elevation Dataset (NED) contains the best publicly available elevation data merged into a seamless dataset for the entire United States. In some cases these data contain unwanted artifacts, limiting the quality of standard hydrologic derivatives. The Elevation Derivatives for National Applications (EDNA) project is an interagency effort with the goal of developing a more hydrologically correct version of the NED. This improved NED will be used in the systematic derivation of standard hydrologic derivatives. Methods and tools have recently been developed to facilitate the semiautomatic creation of a hydrologically conditioned NED and hydrologically improved derivatives.

Conference Paper↗

USGS2001

Watershed delineation using the National Elevation Dataset and semiautomated techniques

Federal, State, and local agencies have realized that currently available hydrologic units are not of sufficient scale for many applications. An interagency effort is under way to subdivide hydrologic units into smaller units called watersheds and subwatersheds. The National Elevation Dataset contains the best available elevation data merged into a seamless database for the entire United States. These data can be readily used to delineate watershed and subwatershed basins. Recently developed ArcView tools facilitate the semiautomatic delineation of watersheds and subwatersheds.

Conference Paper↗