基于多源遥感数据的南宁市建成区动态监测与驱动力分析

Dynamic monitoring and driving force analysis of Nanning built-up area based on multi-source remote sensing data

为了解南宁市建成区空间和时间的扩张特征,本研究选取美国国防气象卫星(DMSP)得到的DMSP/OLS和美国的“索米”国家极轨卫星伙伴卫星(SuomiNPP)得到的NPP-VIIRS两类夜间灯光遥感影像数据,以及Landsat系列遥感影像作为基础数据,提出了一种基于多源数据融合法结合统计数据比较法快速提取城市建成区的方法,基于该方法对2000—2020年南宁市建成区的面积扩张变化、面积重心变化、面积扩张速度和扩张强度变化进行了动态监测和驱动力分析。结果表明:①南宁城区扩张幅度明显,扩张速度呈增强趋势;②南宁市建成区形态以向外扩张、向内填充为主,空间紧凑程度不断下降,空间形态趋于稳定;③建成区重心由西北向东南转移,东南方向为南宁市建成区的主导发展方向;④人口增长和经济发展是城市建成区扩张的直接驱动力和根本驱动力,城市交通运输的发展对建成区扩张具有牵引力与指向性。

To understand the spatial and temporal expansion characteristics of the Nanning built-up area,this study selects two types of nighttime light remote sensing image data obtained by the defense meteorological satellite program/operational line scan system(DMSP/OLS)and the national polar-orbiting partnership/visible infrared imaging radiometer(NPP-VIIRS)from Suomi-NPP,as well as Landsat series of remote sensing imagery as the basic data.The study proposes a method of rapid extraction of urban built-up area based on the fusion of multi-source data combined with statistical data comparison method.Based on the method,it conducts dynamic monitoring and driving force analysis of the area expansion change,area center of gravity change,area expansion speed and expansion intensity change of the built-up area of Nanning from 2000 to 2020.The results are as follows.①The expansion of the Nanning urban area is evident,and the expansion speed shows an enhancing trend.②The morphology of the Nanning built-up area is dominated by outward expansion and inward filling;the degree of spatial compactness is decreasing and the spatial morphology tends to be stable.③The center of gravity of the built-up area is shifted from the northwest to the southeast,and the southeast direction is the dominant direction of the Nanning built-up area.④The population growth is a direct driver of the expansion of the built-up area,and the economic development is a fundamental driver for the expansion.The development of urban transportation has traction and orientation for the expansion of built-up areas.