长江流域1:25万二级流域分级数据集（2002年）

该数据集为长江流域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），包含了长江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，长江区-二级流域.shp。

This dataset is the 2002 1:250,000 hierarchical secondary-level watershed dataset for the Yangtze River Basin, which includes the boundary geometries, subregion names, and watershed coding information of its secondary-level divisions. As a widely adopted national water resources zoning dataset, water resources zoning refers to a relatively fixed and somewhat mandatory zoning framework implemented over a defined period, to ensure that unified basic data is utilized for all water conservancy planning initiatives across a relatively long time span. The dataset covers indicator fields such as the names and coding information of the secondary-level watersheds in the Yangtze River Basin, and contains one shapefile (SHP) vector file named 长江区-二级流域.shp.