Drainage networks for the Three Gorges interbasin area and the middle and lower reaches of the Xijiang River Basin of Guangdong Province are derived by use of ARC/INFO and RiverTools based on the digital elevation models (DEMs) of different scales.

• 在广东西江中下游区间流域和长江三峡区间流域上 ；运用ARC/INFO和RiverTools ；由数字高程模型 (DEM )分别导出了不同空间比例尺下的流域流水网 .