Monitoring urban expansion and land use/land cover changes of Shanghai metropolitan area during the transitional economy (1979–2009) in China
Monitoring urban expansion and land use/land cover changes of Shanghai metropolitan area during the transitional economy (1979–2009) in China
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DOI：
10.1007/s10661-010-1660-8
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发表时间：
2011-06
影响因子：
3
通讯作者：
Jie Yin;Zhane Yin;Haidong Zhong;Shiyuan Xu;Xiaomeng Hu;Jun Wang;Jianping Wu
中科院分区：
文献类型：
--
作者：
Jie Yin;Zhane Yin;Haidong Zhong;Shiyuan Xu;Xiaomeng Hu;Jun Wang;Jianping Wu
利用多时相卫星影像和地理信息系统（GIS），研究了经济转型期（1979-2009年）上海大都市区土地利用/覆盖变化和城市扩展的时空动态与演变。采用最大似然监督分类算法对4幅陆地卫星影像进行信息提取，并采用分类后变化检测技术和基于GIS的空间分析方法对土地利用/土地覆盖变化进行检测。土地利用/覆被变化图的总体Kappa指数在0.79至0.89之间。结果表明，在研究期间，城市化以前所未有的规模和速度加速，导致耕地和绿色土地面积大幅减少。调查结果进一步显示，水体和裸露土地增加，显然是由于2000年后大规模的沿海开发。从1979年到2000年，城市扩张的方向是沿着南北轴线，但在2000年之后，这种增长转变为从现有的城市地区和沿着交通路线向四面八方扩展。上海的城市扩张和随后的土地利用变化在很大程度上是由政策改革、人口增长和经济发展驱动的。通过清除植被的快速城市扩张导致了大范围的生态环境退化。
This study explored the spatio-temporal dynamics and evolution of land use/cover changes and urban expansion in Shanghai metropolitan area, China, during the transitional economy period (1979–2009) using multi-temporal satellite images and geographic information systems (GIS). A maximum likelihood supervised classification algorithm was employed to extract information from four landsat images, with the post-classification change detection technique and GIS-based spatial analysis methods used to detect land-use and land-cover (LULC) changes. The overall Kappa indices of land use/cover change maps ranged from 0.79 to 0.89. Results indicated that urbanization has accelerated at an unprecedented scale and rate during the study period, leading to a considerable reduction in the area of farmland and green land. Findings further revealed that water bodies and bare land increased, obviously due to large-scale coastal development after 2000. The direction of urban expansion was along a north-south axis from 1979 to 2000, but after 2000 this growth changed to spread from both the existing urban area and along transport routes in all directions. Urban expansion and subsequent LULC changes in Shanghai have largely been driven by policy reform, population growth, and economic development. Rapid urban expansion through clearing of vegetation has led to a wide range of eco-environmental degradation.