摘要
利用1987年和2000年的TM影像,对成都市区植被动态变化进行了分析。首先,利用1∶25万数字地形图对2000年的TM影像进行几何校正,并将1987年的TM影像与其配准。其次,利用TM影像的第四和第三波段计算植被指数,根据植被指数提取植被。第三,对成都市区1987～2000年的植被进行了动态变化分析。研究表明,1987～2000年成都市区植被有增有减,但总的趋势是减少:增加部分集中在老城区,是人工绿化的结果;减少部分主要集中在市区西北和西南的面状区域以及因城市道路扩展而占用的线状区域,这是城市化的必然结果。
In this paper,vegetation dynamic changes in Chengdu City was analyzed by making use of TM images in 1987 and 2000. Firstly,TM image in 2000 was geometrically corrected, which was based on 1∶250 000 digital terrain map and then the TM image in 1987 was registrated to it. Next, vegetation index was calculated which was based on band three and band four of TM image,and vegetation was abstracted according to NDVI.Lastly, dynamic changes of vegetation in Chengdu City from 1987 to 2000 were analyzed. The research showed that vegetation in Chengdu City increased and decreased. But, in general, its trend was decreasing. From 1987 to 2000,the increasing part lay in the old city, and the reason was that trees and grasses were planted by people,the decreasing part lay in the northwest and southwest of city, which were polygon region and in the line region, which were occupied for building city roads. This inevitable result was due to urbanization.
出处
《资源开发与市场》
CAS
2005年第1期10-12,16,共4页
Resource Development & Market
基金
国家自然科学基金项目(40161007)
四川省教育厅重点项目(2002A081)
四川省青年基金项目(03ZQ026-0321)。
关键词
成都
TM影像
植被指数
植被动态变化
Chengdu
TM image
vegetation index
vegetation dynamic changes
