Data Description

Medium Resolution: National Hydrography Dataset Landmark Feature (polygon)

This data set contains regions representing areal NHD hydrographic landmark features. 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.

[Keywords: inlandWaters NHD water FWHYDROGRAPHY Stream / River Canal / Ditch Spring / Seep Artificial Path Reach Code Swamp / Marsh Reservoir Lake / Pond Hydrography ]