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

Creator:

United States Geological Survey (USGS)U.S. Environmental Protection Agency

Description:

The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream 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.

Publisher:

State of Pennsylvania

Place:

Philadelphia, Pennsylvania, Pennsylvania

Resource Class:

Datasets

Resource Type:

Vector data

ISO Topic Category:

Inland Waters

Temporal Coverage:

1999

Provider:

Pennsylvania State University

Format:

Files