NHD Point

This dataset includes point data that are contained by a subbasin that overlaps the 16-county NCTCOG region. The data are extracted from the NHD. The NHD is a digital vector dataset that contains features such as lakes, ponds, streams, rivers, canals, dams and stream gages. NHD Points dataset contains points representing NHD hydrographic landmark features. Some points may have reach codes. For more information about NHD features, see the Feature Catalog at http://nhd.usgs.gov/FeatureDirectory.swf. The NHD is a combination of USGS hydrologic digital line graph files (DLG) and EPA reach files, version 3.0 (RF3). The USGS files were used for spatial accuracy and the EPA files were used for attribute information. This dataset was downloaded from http://nhd.usgs.gov/data.html and processed but otherwise unaltered. This file is for reference use only. NCTCOG and its members are not responsible for errors or inaccuracies in the file.本数据集包含位于与16县北德克萨斯中部政府委员会（North Central Texas Council of Governments，简称NCTCOG）区域重叠的子流域范围内的点位数据。该数据提取自全国水文数据集（National Hydrography Dataset，简称NHD）。NHD是一套数字矢量数据集，涵盖湖泊、池塘、溪流、河流、运河、水坝及河道测站等水文要素。NHD点位数据集包含代表NHD水文地标特征的点位，部分点位可能带有河段编码。如需了解NHD要素的更多详情，请参阅要素目录：http://nhd.usgs.gov/FeatureDirectory.swf。NHD由美国地质调查局（United States Geological Survey，简称USGS）的水文数字线画图文件（Digital Line Graph，简称DLG）与美国环境保护署（Environmental Protection Agency，简称EPA）3.0版河段文件（Reach Files version 3.0，简称RF3）整合而成，其中USGS文件用于保障空间精度，EPA文件用于提供属性信息。本数据集从http://nhd.usgs.gov/data.html下载并经处理，未做其他改动。本文件仅可用于参考用途。北德克萨斯中部政府委员会（NCTCOG）及其成员不对本文件中的错误或不准确之处承担责任。