西北诸河流域1:25万二级流域分级数据集（2002年）

该数据集为西北诸河流域2002年1:25万二级流域分级数据集，含二级流域分区边界、流域分区名称及流域编码信息，是常用的全国水资源分区资料（水资源分区是在一个时期内相对固定并带有一定强制性的分区模式，以利于在一个相当长的时期内各项水利规划都采用统一的基本资料），包含了西北诸河流域二级流域的名称及其流域编码等指标字段。
数据集包含1个shp矢量文件，西北诸河区-二级流域.shp。

This dataset is a 2002 1:250,000-scale hierarchical dataset of secondary-level watersheds in the Northwest Rivers Basin. It contains boundary data of secondary watershed zoning, names of watershed zoning, and watershed coding information, and serves as commonly used national water resources zoning data. Water resources zoning refers to a relatively fixed and moderately mandatory zoning framework established over a specific period, which aims to ensure that unified basic data is adopted for all water conservancy planning projects across a relatively long time span. The dataset also includes indicator fields such as the names and watershed codes of secondary watersheds in the Northwest Rivers Basin. In addition, the dataset contains one shapefile vector file: Northwest Rivers Region - Secondary Watersheds.shp.