基于RS与GIS的无锡市城镇建设用地扩展时空特征分析

随着工业化的迅速发展,城市化过程加快,使得城镇建设用地需求增加,土地利用中的矛盾日趋紧张。从不同时相的城市及区域土地利用多源遥感信息提取入手,运用GIS空间分析方法,以“时间过程”与“空间格局”为主线,对无锡市城镇建设用地扩展的时间过程与空间格局特征进行分析,将区域城镇建设用地扩展与自然交通条件和社会经济条件进行综合研究,揭示了无锡市城镇建设用地扩展的时空分异规律。研究表明:改革开放以来,无锡市城镇建设用地扩展具有显著的阶段性,用地扩展模式反映了城市发育、成长乃至成熟的历程；自然交通、社会经济条件的差异以及政策的引导,无锡市城镇建设用地扩展的空间方位差异显著,具有较强的向心性,主城区不同时段扩展的主导方向明显,对其周围集镇具有强大的吸引力和辐射力,它主宰着周围一定范围内集镇用地发展方向。

ANALYSIS OF SPATIAL-TEMPORAL FEATURES IN URBAN LAND USE GROWTH BASED ON RS AND GIS IN WUXI CITY

With the rapid development of industrialization, the process of urbanization is speeded up, which makes the demand of urban land-use increased and the contradiction in land-use more serious. The paper begins with the analysis of urban and regional land-use spatial information by different kinds of remote sensing images of Wuxi City. Then the features of urban land-use growth in Wuxi City were analyzed, which include the features of temporal process and spatial pattern of urban land-use growth by geography information system. Through the integrated research of the spatial-temporal features of urban land-use growth with the regional naturalness, traffic condition and economy conditions, the phase character and spatial distribution laws of urban land-use growth in Wuxi City were studied. The result shows that urban land-use growth in Wuxi City has distinct phase character since 1978, which reflects the course of urban development and maturily. Owing to the diversity of local nature, traffic, society and economy condition and the leading of policy, spatial distribution of urban construction land-use growth in Wuxi City has distinct diversity and strong centripetalism. The central city land-use growth has distinct leading direction at different period of time. And the central city has so strong attraction and radiation force to the market towns that dominate the direction of land-use growth of the market towns scattered around a certain distance.