基于DMSP/OLS夜间灯光数据的长江三角洲地区城市化格局与过程研究  

Pattern and Process of Urbanization in the Yangtze Delta Based on DMSP/OLS Data

作　　者：徐梦洁[1] 陈黎[1] 刘焕金[1] 王慧[1] 

机构地区：[1]南京农业大学公共管理学院,南京210095

出　　处：《国土资源遥感》2011年第3期106-112,共7页Remote Sensing for Land & Resources

基　　金：国家自然科学基金项目(编号:40801062)资助

摘　　要：利用1998、2003和2008年的DMSP/OLS夜间灯光数据,结合相关统计数据,分析灯光数据与城市化进程中经济、人口和土地利用等方面的关系,构建基于灯光数据的城市化水平指数,分析长三角城市群城市化进程和空间模式;通过与统计数据对比,按照最小误差原则确定市辖区建设用地信息提取的阈值,根据各城市在1998～2003年和2003～2008年两个阶段建设用地信息提取阈值的变化,划分城市建设用地的主导扩张类型。研究表明:长三角城市群表现为核心城市的面状扩张、沿交通网络的线状扩张和非核心城市的点状扩张模式,城市群的特征逐渐体现;区域内部城市化发展水平不均衡,但空间差异逐渐缩小;镇江、常州、扬州、无锡、苏州、南通、湖州、嘉兴、绍兴、舟山和台州等市属于填充增强主导扩展类型;南京、杭州和上海则属于外延-填充增强主导扩展类型;泰州和宁波属于填充增强-外延主导扩展类型。The lighted area, night light intensity, compounded night fight index （CNLI） and total night fight index （TNLI） of 16 cities in the Yangtze Delta were derived from the DMSP/OLS night light data in 2008, and their correlations with urbanization statistics were calculated respectively. Of these factors, the night light intensity proved to be an effective indicator for assessing the urbanization level. Construction land information of urban agglomerations in 1998, 2003 and 2008 was also extracted from DMSP/OLS night light data after the determination of the threshold value. Then the pattern and process of urbanization in the Yangtze Delta were analyzed and the expansion process of buildup area was categorized into several types. During the study period, urban agglomerations in the Yangtze Delta had three typical spatial expansion modes, of which the polygon mode could be observed in all the cities, the linear mode exists along main highways and railways, and the point mode occurs mainly around the less important cities. In spite of the imbalance of urbanization level within the study area, the regional differentiation was lessened gradually. According to the .variation of the threshold value from 1998 to 2008, 11 cities, namely Zhenjiang, Changzhou, Yangzhou, Wuxi, Suzhou, Nantong, Huzhou, Jiaxing, Shaoxing, Zhoushan and Taizhou, belonged to the filling - in dominant type, Nanjing, Hangzhou and Shanghai belonged to the first - extension - then - filling - in dominant type, and Taizhou and Ningbo belonged to the first - filling - in - then- extension dominant type.

关 键 词：DMSP/OLS 夜间灯光数据 长江三角洲 城市化 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]