基于MODIS影像和夜间灯光数据的长江中游城群空间特征研究

摘要

This research focused on extracting the urban built-up area from the urban agglomeration in the middle reach of Yangtze river by calculating Normalized Urban Areas Composite Index from 2000 to 2010 and analyzing the spatial distribution and evolution characteristics about Poyang lake city group,ChangZhuTan city group and Wuhan city circle,combining the multi-temporal MODIS series data and DMSP/OLS nighttime light data with the help of Landsat remotely sensed images and statistical data.The study shows that the urban built-up area is extending at an accelerating speed in the city groups along the middle reaches of the Yangtze river.The Wuhan city circle has the most widely distributed space with the spatial pattern of single center spheres.It has been formed with the core city circle center consisting of three cities in the strengthen of the diffusion effect.The spatial distribution of ChangZhuTan city group is trending to multi-center network from dotted-city pattern and "Changsha-Zhuzhou-Xiangtan" urban cluster development is more significant.The space-expansion speed of urban built-up area in Poyang lake city group is the fastest in the study area.It is significant that the spatial distribution pattern of many cities are closely associated with transportation and expanded axially along with the traffic arterial.%本文基于MODIS遥感影像和DMSP/OLS夜间灯光数据,以及Landsat TM/ETM影像数据和统计年鉴数据,通过计算标准城市用地复合指数NUACI,提取2000、2005和2010年三个节点年份长江中游城市群城市建成区范围,分析长江中游环鄱阳湖城市群、武汉城市圈和环长株潭城市群城市建成区空间分布和演变特征.从总体来看,2000-2010年之间长江中游城市群的城市建成区面积扩展速度不断加快,其中武汉城市圈城市建成区面积空间分布最广且城市建成区分布单中心圈层空间格局显著,但随着扩散效应的加强,逐步形成以“鄂州—黄石—黄冈”三城市为核心的城市圈副中心;环长株潭城市群由单城市星状空间分布向多中心网络状空间分布格局发展,“长沙—株洲—湘潭”三城市集群发展更为显著;环鄱阳湖城市群城市建成区空间扩展速度最快,空间分布格局放射轴向特征显著,城市建成区的空间扩展与交通要素关系密切.