基于DMSP/OLS夜间灯光数据的浙江省城镇发展评价

综合DMSP/OLS非辐射定标夜间灯光数据与城镇建成区统计数据,提取夜间灯光数据城镇分割阈值,构建并修正回归方程,以获得能够反映城镇化发展水平的修正回归城镇灯光总值CRTNLI(correct regressive total night light index),该指标与基于行政区的统计数据具有极高的相关性.应用浙江省1993,2003及2013年3年的CRTNLI进行城镇发展潜力和辐射范围分析,结果表明:浙江省中小型城镇发展较快,城镇辐射范围与行政区划一致性高,且基本形成了以杭州、宁波为中心,浙北及沿海平原和浙赣铁路线为轴线的点轴-等级渐进扩散式发展模式.

The evaluate of urban development in Zhejiang province based on DMSP/OLS nighttime light data

Based on the non-radiometric calibration night-light data from the defense meteorological satellite program(DMSP) operational linescan system(OLS) and the statistics data of urban construction district, this paper presents a new light index, the correct regressive total night light index(CRTNLI), which can describe the urban development by calculating the light threshold values and correcting it with regression equation. CRTNLI has obviously positive correlation with the statistics data. Through a case study on Zhejiang province in 1993, 2003 and 2013 with CRTNLI, we analyses the urban potential and the hiterland. The result shows that small and medium-sized towns are going through rapid urbanization. The hiterland has a high consistency with the prefecture-level administrative divisions. The Zhejiang province urban development shows a pattern, a point-axis system consisting of two major growth pole, i.e. Hangzhou, Ningbo, and three developing axes, i.e. North-Zhejiang plain, coastal belt plain and Zhejiang-Jiangxi railway.