20世纪90年代中国城市时空变化特征——基于灯光指数CNLI方法的探讨

Application of Compound Night Light Index Derived from DMSP/OLS Data to Urbanization Analysis in China in the 1990s

用DMSP/OLS夜间平均灯光强度图像在区域上的扩展特征和聚集特征构建了一反映区域城市化综合水平的灯光指数CNLI (compounded night light index) , 并分别在省级和县级尺度上对CNLI与基于统计数据的城市化水平指数做了相关分析,结果表明CNLI与基于统计数据的城市化水平复合指数显著相关,最后用CNLI分析了中国省际城市化水平的时空特征。CNLI为客观、实时监测城市化水平的空间格局及其发展变化提供了新的指标和方法。

This paper presented compounded night light index (CNLI) derived from DMSP/OLS data which were pre-processed by Japan National Institute of Environmental Studies for regional urbanization level estimation considering the light spatial distribution and intensity. The correlation analyses between light indices and composite urbanization indices were carried out at provincial level and county level. They can also be carried out in other scales if appropriate census data are available. The results show that there were significant re-lationships between the two kinds of indices. The regression models at provincial scale and county scale for composite urbanization index estimation using CNLI were also developed. It suggests that CNLI is an effective and applicable index for regional urbanization analysis and monitoring. Analysis of the changes of CNLI, S and I in China during the period 1992-1998 showed that the imbalance of urbanization level in China was obvious. It was higher in the east and lower in the west. Urbanization level was improved largely during 1992-1998, but the speed and the type of development were different.