Sandra K. Franken | Geology Reports

USGS2004

The USGS/EROS Data Center produces seamless hydrologic derivatives with GIS

Increasingly, many local, state, and federal agencies mandated to manage water resources are finding that their needs are not being met by existing digital data sets. Current national coverage of digital data sets, such as drainage basin boundaries and consistent elevation-derived parameters, does not exist or is not of a suitable scale or consistency to allow management of small or midsize watersheds. This problem has become more significant as the management of water resources, both in terms of quantity and quality, is becoming more and more based on the watershed scale.

ArcNews↗

USGS2001

Development of a national seamless database of topography and hydrologic derivatives

The recent completion of the National Elevation Dataset (NED) and the National Hydrography Dataset (NHD) has provided an avenue for nationwide development of topographically derived hydrologic data layers at a scale of 1:24,000. This multilayer dataset of hydrologic derivatives, entitled the Elevation Derivatives for National Applications (EDNA), is being developed by a consortium of participants, including the U.S. Geological Survey (USGS), National Weather Service (NWS), the Environmental Protection Agency (EPA) and others. After the dataset is completed, terabytes of data will need to be stored, managed and distributed. To facilitate browse and, ultimately, delivery of the EDNA data, the consortium decided to manage the data layers with ArcSDE and provide browse and delivery of the data through the use of ArcIMS.

Conference Paper↗