基于landsat8序列影像的郑州市城市边缘带提取
2017-06-15乔贤贤杨玲段琳琳刘祖瑾洪小瑞
乔贤贤+杨玲+段琳琳+刘祖瑾+洪小瑞
摘 要: 城市边缘带是城市与乡村之间的过渡区域。我国城镇建设日益发展,使城市边缘带成为研究热点。以郑州市作为研究对象,利用RS和GIS技术,采用2013-2016年四景覆盖郑州市landsat8影像数据,选择基于土地利用程度的边缘带范围界定的方法,结合土地利用特征,设置阈值提取城市边缘带。结果显示城市边缘带呈环形,惠济区及经济开发区边缘带范围偏大,靠近山区的西南部边缘带范围偏小。对比得出2013年-2016年郑州市城市边缘带区域土地利用类型变化显著;建成区主要向北和西北部扩展,农村土地利用类型向城市建设用地过渡。
关键词: 城市边缘带; 土地利用; 提取; 对比分析
中图分类号:TP79 文献标志码:A 文章编号:1006-8228(2017)06-47-05
Extraction of urban fringe of Zhengzhou City based on landsat8 sequence images
Qiao Xianxian, Yang Ling, Duan Linlin, Liu Zujin, Hong Xiaorui
(College of environment and planning,Henan University, Kaifeng, Hennan 475004, China)
Abstract: Urban fringe is the transition area between city and countryside. With the development of urban construction in China, the urban fringe becomes a research hotspot. This paper, taking Zhengzhou city as the research object, using RS and GIS technology, using 2013-2016 four scenes covering the landsat8 image data of Zhengzhou City, selecting the urban fringe defining method based on the land use degree, combining with the characteristics of land use, sets the thresholds to extract the edge of the city zone. The results show that the urban fringe is annular, the edge zone of Huiji District and Economic Development Zone is relatively large, and the southwestern edge zone near the mountains is relatively small. By comparison, it is concluded that the land use types of urban fringe in Zhengzhou city changed significantly in 2013-2016, the built-up area mainly extends to the north and northwest, and the rural land is transition to the urban construction land.
Key words: urban fringe; land use; extraction; comparative analysis
0 引言
城市邊缘带是城市建成区和纯农业区的中间地带,同时具有城市与农村两种特征,在人口密度方面,周围乡村低于城市边缘带,而城市边缘带低于市中心[1-2]。它在城市化发展过程中最为敏感,土地利用覆盖变化较为明显,所以根据城市土地利用变化对城市边缘带进行研究。城市经济发展到一定阶段必将造成城市化,城市扩展是指在城市化的过程中会带动周边城市边缘区域的不断发展,而城市边缘区发展也促使城市内部环境发生改变。
当前国内外许多学者进行城市边缘地带研究。姚月通过地理信息系统和遥感技术对北京市海淀区城市边缘带和空间扩张进行定量分析[3]。程连生等通过熵值转折点确定北京城市的内外边界[4]。……
