黄河流域1:25万三级流域分区内水系分布数据集（2012年）

本数据集在国家基础地理信息中心全国1:25万地形数据库基础上，提取水系数据，根据《中国河流名称代码》（SL 249-2012）进行梳理，可对全国4级流域（水系）以上主干河流及其支流进行编码，参考《中国河湖大典》补全7级以上河流，并对照遥感卫星影像确定河流走向。
数据为线层矢量数据。该数据的特点为：每条河流在空间上都是完整的要素，每条河流源头进行了核定，河流流向明确；结合子流域特征，按照河流长度大小，对其主干支流进行了划分，河网层次明确。

This dataset is derived by extracting river network data from the national 1:250,000-scale topographic database of the National Geomatics Center of China, and standardized in accordance with the *Code for Chinese River Names* (SL 249-2012). It supports coding for main stem rivers and their tributaries at the 4th-order basin (water system) level and above across China. Rivers with a rank of 7th-order and above are supplemented by referencing the *Dictionary of China's Rivers and Lakes*, and their flow directions are confirmed via comparison with remote sensing satellite imagery.

The dataset is provided as line vector data. Its core characteristics are as follows: 1) Each river constitutes a complete spatial feature, with its source verified and flow direction unambiguously defined; 2) Combined with sub-basin features, main stems and tributaries are categorized based on river length, yielding a clearly hierarchical river network.

搜集汇总

背景与挑战

背景概述

该数据集基于全国1:25万地形数据库，提取黄河流域水系数据，并依据《中国河流名称代码》和《中国河湖大典》进行编码和补全，确保河流信息的标准化和完整性。数据为线层矢量格式，每条河流空间完整、源头核定、流向明确，且根据河流长度划分主干支流，河网层次清晰，适用于水文分析和流域管理。