基于NPP-VIIRS夜间灯光遥感数据的西安市城市扩张研究

Research on urban expansion of Xi′an city based on NPP-VIIRS night light remote sensing data

本文基于2012—2020年夜间灯光遥感数据,利用参考比较法、标准差椭圆分析法,研究西安市城市建成区扩张特征。结果表明,采用参考比较法提取的城市建成区面积与官方公布的统计面积之间的差异小;西安市建成区整体呈集聚式分布,且各区(县)城市建设发展水平存在着较为明显的差距;西安市建成区扩展速度与扩展强度的变化趋势基本一致,大体呈现先增加再减少后趋于停滞的态势;西安市夜间灯光基本上沿着“西北—东南”方向分布;2012—2020年西安市建成区中心点向东北方向移动了约1 042.82 m,夜间灯光分布的椭圆面积增加了约297.10 km^(2),呈现空间扩张趋势。

Based on the night light remote sensing data from 2012 to 2020,this paper studies the urban built up area expansion characteristics of Xi′an city by reference comparison method and standard deviation ellipse analysis.The results show that the difference between the urban built up area extracted by the reference comparison method and the officially announced statistical area is small.The built up area of Xi′an city shows the characteristics of agglomerative distribution as a whole,and the urban construction and development level of each district(county)has a relatively obvious gap.The change trend of the expansion speed and expansion intensity of the built up areas in Xi′an city is basically the same,generally showing a trend of first increasing and then decreasing and then tending to stagnation.Xi′an city night lights are basically distributed along the"northwest southeast"direction.From 2012 to 2020,the central point of built up area in Xi′an city moved to the northeast by about 1042.82 m,and the elliptical area of night light distribution increased by about 297.10 km^(2),showing a spatial expansion trend.