洞庭湖流域1:25万分级河网数据集（2002年）

该数据集为洞庭湖流域25万水系分级数据，含有水系名称、编码、级别等信息。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；河流编码在《中国河流名称代码》（SL 249-1999）基础上进行了扩充，扩大可编码的河流总量，编码同时反映出河流的主干支流和河流级别，满足中小尺度流域研究的需要。该数据为中、小尺度流域或区域研究服务，构建了正确可操作的河网。
数据内容包括1个shp文件，为线图层矢量数据，“洞庭湖流域25万分级河网.shp”。

This dataset is a 1:250,000-scale hierarchical river system dataset for the Dongting Lake Basin, which contains information such as river system names, codes and hierarchy levels.
The characteristics of this dataset are as follows:
1. Each river is a complete spatial feature, with verified source locations and clear flow directions;
2. Combined with sub-basin characteristics, main stems and tributaries are classified based on river length, resulting in a clearly hierarchical river network;
3. The river codes are expanded based on the *Code for Chinese River Names* (SL 249-1999), increasing the total number of codable rivers. The codes simultaneously reflect the main-tributary relationship and hierarchy level of rivers, meeting the research needs of medium and small-scale basins.
This dataset serves medium and small-scale basin or regional research, and has constructed a correctly formatted and operable river network.
The dataset includes one shapefile (SHP), which is a line-layer vector data named "Dongting Lake Basin 1:250,000 Hierarchical River Network.shp".

搜集汇总

背景与挑战

背景概述

该数据集是2002年洞庭湖流域的1:25万分级河网矢量数据，以shp线图层格式提供，包含水系名称、编码和级别等信息。其特点在于每条河流在空间上完整、源头核定、流向明确，并基于河流长度和子流域特征划分主干支流，河网层次清晰；河流编码在《中国河流名称代码》基础上进行了扩充，支持中小尺度流域研究。数据质量优良，适用于自然地理学和水资源相关的中小尺度研究。