Evaluation of small watershed management efforts using ZY-3 satellite images — A case stduy in the water source area of middle route of south to North Water Diversion project

摘要

The evaluation of small watershed management efforts is significantly meaningful to design and implement projects of protecting the water quality in water source area. In this paper, the images of GaoFen-1(GF1) and the China's first civilian high-resolution stereo mapping satellite, ZiYuan-3 (ZY-3) satellite, were used to get the land surface information in a small watershed in the water source area of middle route of South to North Water Diversion Project (SNWDP). The change of land surface was also extracted using images with different period. The effects of grain to green solutions implemented in small watershed management were then analyzed. The results indicate that high-resolution images with different periods have a great potential to monitor land cover change in small watershed and is expected to be useful for evaluating small watershed control efforts, in turn for the environment protection in water source area.