Waterbody - Large Scale

The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's...国家水文数据集（National Hydrography Dataset，NHD）是一款基于要素的数据库，可对构成该国水系的河段实现互联互通，并为其赋予唯一标识符。