Lianyungang Urban Expansion Model Analysis Based on Remote Sensing and Geographical Information System

Multi-temporal remote sensing data were taken as data source, land use/ land cover change during the process of urban expansion was extracted by supervise method. On this basis, temporal and spatial variation rules for typical urban land were analyzed in detail and urban expansion model was discussed by visual interpretation method. Researches were indicated that the expansion speed of salt fields and aquiculture regions were the quickest during about ten years, while the total area of farmland in 2009 was larger than that in 2002. On the other hand, urban expansion model was concluded: in Xinpu district, axial direction banding and low density sprawl were the main model of urban expansion; in Donghai county, reticulation expansion and skipping expansion were the main expansion model. While, axial direction banding and round-sprawl in Ganyu county, axial direction banding and reticulation expansion in Guanyun county, and axial direction banding and round-sprawl and skipping expansion in Guannan county. Above analysis is showed that: Land use/ land cover change detection using multi-temporal images by remote sensing (RS) and geographical information system (GIS) technology are one of effective means of analyzing urban expansion.