美国国家水文数据综述

Introduction of the National Hydrography Dataset of the United States

美国国家水文数据是美国最新的数字地理空间数据库内容之一 ,是一种基于要素的复合矢量数据产品。美国国家水文数据为数据的增加、删除和改正设计了专门的方法 ,同时还涉及有自动识别和追踪更新数据的功能。介绍了美国国家水文数据的数据源和数据用途 ,分析了其数据特征 ,描述了其独特的数据更新方法 ,可供国内同行设计此类基础地理信息产品时参考。

The National Hydrography Dataset (NHD) of the United States is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. It is the latest comprehensive set of digital spatial data, which has been designed to identify, accept, and track updates. This paper introduces the resources and many applications of it, analyses the feature types and characteristics, especially introduces the unique way on how the dataset is maintained.