基于DMSP/OLS数据的安徽省城市空间动态扩张分析

Monitoring of the Urban Expansion Dynamics in Anhui Province Using DMSP/OLS Nighttime Light Imagery

对长时间序列DMSP/OLS夜间灯光影像进行连续性校正,结合改进的“动态阈值法”提取建成区范围,动态监测安徽省2000—2013年各城市空间格局演变特征和趋势。结果表明:13年间,安徽省城市夜间灯光亮度呈现明显动态扩张态势,形成了以合肥为圆心,沿交通廊道放射状辐射150km半径的合肥都市圈。各个城市建成区面积持续增长,受“中部崛起”和“承接产业转移”等重大战略实施影响,2007年和2010年为建成区面积增长率的高峰期。合肥、芜湖、滁州和马鞍山城市规模和增长面积较大,全省建成区重心分布于省域的中部,重心整体迁移方向是南偏东,体现了安徽积极融入长三角的主体发展战略。

The long-time series DMSP/OLS nighttime light imageries were continuously corrected.The built-up area was extracted by using the improved"dynamic threshold method"to dynamically monitor the evolution characteristics and trends of urban spatial pattern in Anhui Province from 2000 to 2013.The results show that during the past 13 years,the urban night light intensity in Anhui Province has shown an obvious dynamic expansion trend while forming a Hefei metropolitan area with Hefei as the center and radiating a radius of 150 km along the traffic corridor.The continuous growth of the built-up area extracting from nighttime light imageries of each city.The built-up area increased reached peak growth rate in 2007 and 2010 affected by the implementation of major strategies such as"rise of central China"and"Carrying on industry transfer".Hefei,Wuhu,Chuzhou and Ma'anshan have large urban scale and growth area.The center of gravity of the built-up area of the province is located in the middle of Anhui.The overall transfer direction of the center of gravity is south by East,which reflects the main development strategy of Anhui's active integration into the Yangtze River Delta.