Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

National Hydrography Dataset (NHD) Watersheds: Pennsylvania (medium resolution)

Author:
Description:
The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the sream segments or reaches that comprise the nation's surface water drainage system. Medium resolution NHD is based on the content of the U.S. Geological Survey 1:100,000-scale Digital Line Graph (DLG) hydrography data, integrated with reach-related information from the U.S. Environmental Protection Agency Reach File Version 3.0 (RF3). More specifically, it contains reach codes for networked features and isolated lakes, flow direction, names, stream level, and centerline representations for areal water bodies. Reaches are also defined to represent water bodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.
Collection:
Pennsylvania Spatial Data Access (PASDA)
Places:
Philadelphia, Pennsylvania, United States and Pennsylvania, United States
Subjects:
Hydrology and Inland Waters
Year:
1999
Contributed by:
Penn State
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