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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.
Based on the DMSP / OLS non-radiative calibration nighttime lighting data and the statistic data of the built-up areas in the cities, the threshold value of urban lighting segmentation is extracted and the regression equation is constructed and modified to obtain the corrected CRTLI regressive total night light index, which is highly correlated with the administrative district-based statistics.Using CRTNLI of Zhejiang Province in 1993, 2003 and 2013 for the potential of urban development and analysis of the radiation range, the results show that: The development of small cities and towns is rapid, and the scope of radiation in urban areas is highly consistent with that of administrative divisions. As a result, a point-axis-level gradual and diffusive development mode centered on Hangzhou and Ningbo as the center, the northwestern and coastal plains and the Zhejiang-Jiangxi railway line is basically formed.