基于夜光数据的昆明市城市扩张格局演变分析

Analysis of Urban Expansion Pattern of Kunming City Based on Nighttime Light Data

基于夜光数据采用POI&NPP综合指数提取建成区,然后进行建成区面积精度评定,从定性和定量两个角度进行城市扩张空间形态及格局演变分析。结果表明:1)POI融入夜光数据后,提高了提取的精度,提取边界与实际的分布范围更为接近。2)扩张速度和强度较快区域主要集中在呈贡区、嵩明县等,而较慢区域集中在北部的禄劝县、东川区、寻甸县等;嵩明县的动态变化率最高,中心城区的区域动态变化率较低,北部的寻甸县、东南部的宜良县、石林县动态变化率反而较高。3)昆明市整体上经济重心经度方向为向东偏移,纬度方向为向南偏移。

Based on the nighttime light data,the built-up area is extracted by POI&NPP comprehensive index,and then the area accuracy of the built-up area is evaluated.This paper analyzes the urban expansion pattern evolution.The results show that:(1)After the POI data is integrated into the nighttime light data,the extraction accuracy is improved,and the boundary is closer to the actual distribution range.(2)The regions with rapid expansion speed and intensity are mainly concentrated in Chenggong and Songming,while Luquan,Dongchuan and Xundian in the north are of slow expansion;Songming has the highest dynamic change rate,while the regional dynamic change rate in the central urban area is lower,while Xundian,Yiliang and Shilin in the north have higher dynamic change rates.(3)On the whole,the longitude direction of the economic center of gravity in Kunming is eastward and the latitude direction is southward.