摘要
基于多时相Landsat TM/ETM＋数据和GIS技术,采用人机交互的遥感图像监督分类和空间叠加方法提取了1991,1999,2008三个年份杭州市辖区建设用地专题信息,分时段重点分析了从1991-2008年各市辖区城市扩展强度指数、方向及其侵占其他用地情况,揭示了杭州城市扩展的社会经济等多方面的驱动力因子与作用机制。结果表明：18年来,杭州城市用地快速扩展,各市辖区扩展速度和扩展强度表现出明显的阶段性和空间差异性。与1991年相比,2008年城市建设用地规模增加到近3倍,被侵占用地的主要类型是农用地,其次为水域和林地,其中农用地占66.98%,水域占17.71%,林地占15.31%。分析表明：城市人口、经济总量的快速增长、社会和外商投资额大幅增加、快速增加,以及快速的旧城更新和郊区房地产开发、高教园区和科技开发园区的用地组团式开发、跨江大桥和内外绕城公路的建设等因素是近18年杭州城市空间扩展的主要驱动力。政府应该反思在不同城市扩展阶段的得失,思考如何实现未来城市的理性扩展。
Based on multi-temporal Landsat TM/ETM＋ Images and GIS, we extracted information of urban construction land use in Hangzhou with supervised classification and overlay technology. The characteristics of the changes of urban construction land use were analyzed with the aid of spatial overlay technique in order to obtain urban spatial expansion information. Then, the intensity index, direction of urban expansion as well as the situation of the land occupied by urban expansion are analyzed quantitatively, and the socioeconomic driving forces factor and their effect mechanism during the last 15 years （1991 to 2008） were explained. The result revealed that the rate of urban expansion in Hangzhou city was very quick and the urban land area in 2008 was over twice more than that in 1991. The arable land around the urban area, water body and woodland, the main land use types due to the urban expansion, accounted for 66.98%, 17.71% and 15. 31% respectively. The study also showed that the main human driving forces causing urban expansion in Hangzhou in the past 15 years included the following aspects, the high-speed economic development, the rapid growth of population, the increase of investment at home and abroad, the quick renewal in the old city and the development of suburban real estate, the group development of Higher Education and Science and Technology Development Zone, and the development of urban transport facilities such as the four bridges across the Qiantang River and the two ringed highways around the Hangzhou city. The local government ought to rethink profoundly the advantages and disadvantages of urban expansion in the different stages, and to do in-depth analyses of the future urban expansion mechanism to push forward sustainable urban expansion.
出处
《地理研究》
CSCD
北大核心
2009年第3期685-695,共11页
Geographical Research
基金
国家高技术研究发展计划(863)项目(2007AA12Z232)
浙江省自然科学基金资助项目(M403040)
关键词
城市扩展
遥感
GIS
驱动机制
杭州市
urban expansion
remote sensing
GIS
driving mechanism
Hangzhou city
