基于多时相Landsat的衡阳市城区扩张模式研究

Expansion of Urban Based on Multi-temporal Landsat

本研究基于RS和GIS技术,以衡阳中心城区(珠晖区、雁峰区、石鼓区、蒸湘区)为研究区域,利用多时相的Landsat数据,探讨衡阳城区2000—2015年15年期间建设用地扩张的规律。定量分析主城区在不同时段的扩张过程、特点及扩张模式,分析衡阳市城区的发展趋势,研究表明:衡阳市城区2000—2015年间通过大量侵占耕地来满足城区扩张过程中的建设用地土地需求。建设用地增加78.3 km^2,耕地面积减少122.6 km^2。其扩张方向由西部蒸湘区转向南部雁峰区后转向东部珠晖区。15年的整体扩张模式表现为以中心城为圆心的"同心圆"式蔓延扩张,且具有明显的各向异性,为科学制订和完善城市规划、实现城市社会经济与环境的可持续发展提供数据支撑。

In this paper, based on the RS and GIS technology, Hengyang urban center for the study area（ Zhuhui, Yanfeng, Shigu, Zhengxiang）. Explored the regulation of the construction and expansion of Hengyang urban during 15 years from 2000 to 2015 ,based on multi - temporal Landsat data~ Researched the expansion process, characteristics, and expansion mode for different periods quanti- tatively. Studied the development trend of Hengyang urban, not only purpose to provide data supports for planning and improving a scientific and perfect urban system but also realize the sustainable development of urban social economy and the environment.