基于遥感的达州市城市扩展研究与机制分析

Research on Dazhou City Urban Expansion and Mechanism Analysis Based on Remote Sensing

基于1995年、2002年、2006年、2010年的Landsat TM遥感影像,利用ArcGIS平台工具ENVI进行数据提取;通过研究影像光谱反射率和了解实地地物,提出了达州市建筑用地的提取方法。在定量分析达州市城市建筑用地的基础上,引入扩展弹性系数、扩展强度指标等多项指标,分析了达州市城市扩展的时空规律和形态特征。结果表明,达州市区城市扩展的速度、方向等受自然条件、社会经济条件等因素的影响,其自然地理环境决定了城市建筑用地沿河流发展、并尽量向平坦区域扩张,避免了山地和丘陵;而其社会经济状况对达州市建设起到了重要的推动作用。

Remote sensing technology has improved with the development of science and technology.This paper is an example of building land ex⁃traction in Dazhou through research on TM spectral reflectance and understanding of field feature,with Landsat TM remote sensing image in 1995,2002,2006 and 2010 as the data source,ENVI data extraction tools,and ArcGIS mapping and data analysis tools.Through quantitative analysis of Dazhou city building land,the Dazhou city urban building information of four phases for 15 years were extracted through the introduction of extend⁃ed strength indicators,expansion coefficient of elasticity and other indicators.We also studied Dazhou’s urban expansion morphological characteris⁃tics and temporal patterns.The results show that the urban expansion speed and direction in Dazhou city such as natural condition and social eco⁃nomic condition,and the influence of such factors as the natural geographical environment are determined by the urban construction land develop⁃ment direction along the river as far as the flat area expansion to avoid mountains and hills.The social and economic status of Dazhou construction played an important role.