Abstract

NHDPlus Version 2 Web Services
Track: Water Resources
Authors: L. McKay, Tommy Dewald

The U.S. Geological Survey (USGS) and U.S. Environmental Protection Agency (USEPA) have collaborated to produce Version 2 of the National Hydrography Dataset Plus (NHDPlus.) The NHDPlus comprises an integrated suite of hydrologic geospatial data sets, including a hydrographic stream network, polygonal catchment areas representing incremental drainage areas for each stream network element, and Digital Elevation Model (DEM) derivatives including flow direction and flow accumulation grids. In recent years the geospatial data user community has increasingly made use of Web Mapping Services (WMS) and Web Feature Services (WFS). Web sites such as Geoplatform.gov and ArcGIS.com, among others, allow users to easily create "mashups", combining perhaps several different map services to meet a specific need. This presentation will provide an overview of currently available NHDPlus map services, and show examples of their use for different purposes.