Research On Land Use/Cover Change Based On RS And GIS

The Guangqiao River Catchment is situated at the low mountain-hill region of the middle and lower reaches of the Changjiang River.In recent years,the natural disaster presented frequently.Due to a friable ecological environment and a severe conflict between economic development and ecological environment,many environmental problems were happened.Therefore,a comprehensive study on its land use/cover change was conducted with the methods of field investigation,RS and GIS, in order to restore and control the ecological environment.As a result,some suggestions could be made for the government with reliable and accurate land use change situation,which can guide people to exploit natural resources reasonably, realizing land sustainable use and society sustainable development furthermore.Firstly,in the case,the system of land use/cover change(LUCC) classification and the Interpretation Marks of LUCC were founded.Secondly,with Remote Sensing and Geographical Information System software,the topographic map of 1984 and the image of 2007 were analyzed.The procedures are as follows:geometrically correct and merge the image data of the two-temporal,the land use classification vector map, and the spatial overlay function.Finally,the LUCC in the Guangqiao River Catchment are thoroughly analyzed through quantity change,use intensity change, and spatio-temporal change of land use.The LUCC was analyzed during 23-year,and the main type,direction of the land use change and the change's mechanism were illustrated.(1) In general,in river basin,the area of woodland,other farmland,residential land,water-conservancy land,tidal-flat are added by7.5563km~2,0.7157km~2,0.5742 km~2,0.0074km~2,0.0987km~2 respectively,the area of cultivated land,garden-plot land, grassland present reduce trend,and the area decrease by 5.5415km~2,1.183km~2, 2.2276km~2 respectively.(2) Seeing from the structure of land,there were existed different changes among the kinds of land.The area reduced from the cultivated land,garden-plot land and grassland were added to the woodland were respectively 4.7157km~2,0.7936km~2, 2.2276km~2,in which,the area falling off in grassland almost added to the woodland; the residential land were increased by the change of cultivated land,garden-plot land, woodland and other farmland,the area which the land reduce were respectively 0.3946km2,0.1792km~2,0.0072km~2,0.0003km~2;the cultivated land,garden-plot land, woodland respectively interchanged area about 0.2412km~2,0.3032km~2,0.1747km~2 to other farmland;the area about 0.0985km~2,0.0002km~2 change from cultivated land and residential land to tidal-flat.There were no obvious change in water area.(3) The driving factors and the mechanism of change,which were lead to Land use/cover change were analyzed in the Guangqiao River Catchment.The results showed that natural factors,population factors and policy factors were main reasons brought about the change.