近30年南宁市建成区时空扩张特征分析

Analysis of Spatial and Temporal Expansion Characteristics of Built-Up Area in Nanning City in Recent 30 Years

为了解南宁市建成区的时空扩张特征,文章以1990年、2000年、2010年和2019年LandsatTM/OLI系列遥感影像作为数据,通过遥感解译出南宁市建成区信息,应用扩张速率和扩展强度、扩张方向等指标定量分析1990-2019年南宁市建成区时空转移特征。结果表明:(1)南宁市区扩张明显,扩展速度呈增强趋势;(2)南宁市建成区形态主要是向外扩张和内部填充,空间紧凑度不断下降,空间形态趋于稳定;(3)南宁市建成区的重心由西北向东南迁移,东南方向是南宁市建成区主导扩张方向。

In order to understand the spatial and temporal expansion characteristics of built-up area in Nanning city, this paper takes Landsat TM/OLI series remote sensing images in 1990, 2000, 2010 and 2019 as data, interprets the information of built-up area in Nanning city through remote sensing, and quantitatively analyzes the spatial and temporal transfer characteristics of built-up area in Nanning city from 1990 to 2019 by using indicators such as expansion rate, expansion intensity and expansion direction. The results show that:(1) the urban expansion of Nanning is obvious, and the expansion speed shows an increasing trend;(2) the form of built-up area in Nanning city is mainly outward expansion and internal filling, the spatial compactness continues to decline, and the spatial form tends to be stable;(3) the center of gravity of the built-up area of Nanning city moves from northwest to southeast, and southeast is the dominant expansion direction of the built-up area of Nanning city.