EXPANSION OF URBAN CONSTRUCTION LAND IN SHANGHAI CITY BASED ON RS AND GIS

Based on the multiple-temporal remote sensing data and GIS analysis,this paper analyzes the change and spatial expansion characteristics of urban construction land in Shanghai City.The driving force of urban growth and its comprehensive evaluation are given in this paper by using social economical data and correlation analysis.From 1985 to 1995,the growth of urban construction land was mainly located around outskirts of Shanghai City,while from 1995 to 2000,the growth in different districts was obviously diversified;more arable land and rural residential areas were occupied by urban growth with different expansion grade and scale in different direction;as the distance increases from the central downtown area,the growth intensity index displays the same change situation in different periods and the highest index is in the urban fringe.The economic growth is the decisive factor influencing the urban construction land expansion,and the development of local towns and industrial enterprise is also the important factor.