基于RS和GIS的上海城建用地扩展研究

利用多时相遥感影像，借助GIS强大的空间分析功能对上海市城镇建设用地的时空扩展过程、特征、规律作了探讨，结合社会经济统计数据对上海市城镇建设用地扩展驱动力进行了分析和综合评估。研究结果表明：1985~1995年城镇建设用地扩展主要集中于城郊边缘地带，而1995~2000年地区扩展差异则更为明显；上海城市扩展主要侵占的用地类型为耕地，其中以水田为主，同时也占用了较多的农村居民点；上海城镇建设用地在不同方向上扩展程度和规模有较大不同；随着距离城区几何中心点距离的增加，各阶段城镇建设用地扩展强度指数都呈现一个大致相同的变化过程，扩展强度指数最高的区域大多位于上海主城区的外围即城乡交替地带；经济发展是上海城镇建设用地扩展的决定因素，郊区小城镇及小城镇工业的发展是郊区城镇建设用地扩张的一个重要影响因素。

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.