Dynamic monitoring of the water area changes in Luoyang River using remote sensing technology.

This paper discusses water changes of the Luoyang River based on Landsat TM(thematic mapper) satellite image of 1994,Landsat ETM+(enhanced thematic mapper) satellite images of 2002 and 2007.Information of water changes acquired mainly from change detection and information extraction and a series of remote sensing technology.The results show that in the study of 13 years,the overall increase in water area is 165.60 hm2.Owing to the urban expansion of Luojiang District as well as the Fuzhou-Xiamen expressway and Quanxiao railways opened to traffic,the water areas of the north of shuangyang town and luoyang town shrunk during 1994-2007.Also,because of the destruction of coastal mangrove forests and loss of natural barriers,waters of the south area increased and main channel of Luoyang River widened.