全国主要一级河流地图，有长江黄河还有主要的湖泊水系，可以做简单的分析使用(Major first-class River maps in China, including the Yangtze River and Yellow River, as well as major lake systems, can be used for simple analysis.)

国家一级河流全覆盖，用于地理信息等相关领域科研制图，有标准投影(Used for scientific research mapping in geographic information and other related fields)