关键词: 上海地区, 城市用地扩展, 空间行为特征, 缓冲带分析

Abstract:

By using multi temporal remotely sensed data of TM & ETM, the spatial behavior of urban growth in Shanghai Region was studied by establishing and applying the urbanization metrics (i e UPI & UII) in GIS buffering analysis, which was also used in comparing and analysing the spatio temporal changes in urban landuse growth of central and sub cities of Shanghai The results showed that: 1) Being without influence of large scale geomorphic heterogeneity except geo contrast between the ocean and terrene, the spatial behavior of urban landuse expanding is largely regulated by the distance to the Shanghai central city (i e CBD) Urban landuse expanding exhibited the distinctive spatial characteristics in different periods, and the activity & spatial distribution of urban expanding circle also showed their unique traits in different periods. 2) The urban landuse growth presented obvious trends in directional variation The overall directional variation within 10 km to the CBD is dominated by spatial heterogeneity in central urban landuse growth, whereas the distribution and the variation in growth rate of sub cities play the key role in overall directional heterogeneity beyond 10 km to the CBD, and the small scale geomorphic variation from the spatial pattern of rivers and channels also shows its contribution. 3) Shanghai central city keeps overwhelming preponderance to the sub cities in magnitude, intensity and potential of urban landuse growth Affected by the location and sociao economic condition, the main sub cities performed differently in their spatial behavior of urban landuse growth individually, and thus can be classified into four categories according to their performance in urban landuse expanding (i e Standard, Passive, Steady and Irregular types)

Key words: central and sub cities of Shanghai, urban landuse growth, spatial behavior, directional variation, buffering analysis