基于NPP-VIIRS夜光数据的北京市建成区提取和分析

Extraction and Analysis of Built-up Areas in Beijing Based on NPP-VIIRS Luminous Data Set

一般的统计方法难以把握城市扩张的动态变化,而利用夜光遥感监测能够准确、高效地得出结论。该文利用对数变换后的NPP-VIIRS数据通过突变检测法提取2013—2018年北京市建成区边界,计算其几何统计特征,与中国城市统计年鉴数据对比,采用扩展速率、紧凑度、分形维数等指标分析北京市向外扩张特点。得出结论,北京市建成区扩张趋于稳定,中心城区发展较完善,城市由向外扩张型发展,逐渐转化为高质量发展,符合相关政策。

General statistical methods are difficult to grasp the dynamic changes of urban expansion,but with the use of luminous remote sensing data set,one can monitor and draw conclusions accurately and efficiently.This paper uses the logarithmically transformed NPP-VIIRS data set to extract the boundary of Beijing built-up area from2013 to 2018 by mutation detection method,calculate its geometric statistical characteristics,compare it with the data in China’s urban statistical yearbook,and analyze the outward expansion characteristics of Beijing by using indicators such as expansion rate,compactness and fractal dimension.It is concluded that the expansion of built-up area in Beijing tends to be stable,and the development of the central city is relatively perfect.The development of the city from outward expansion to high quality development is in line with relevant policies.