Dynamic Supervision and Reason Analysis of Vegetation Coverage Changes of Chengdu in the Past 20 years
DANG Qing1, YANG Wu-nian2
1. State Key Lab of Geo-hazard Prevention and Geo-environment Protection, Chengdu 610059, China;
2. Ministerial Key Lab of Information Technology & Application of Land and Resources/Institute of Remote Sensing &GIS, Chengdu University of Technology, Chengdu 610059, China
Using 1992,2001 and 2009 TM remote sensing data,the authors estimated the vegetation coverage change status of Chengdu in the past 20 years objectively and quantitatively. The study has practical significance for adjusting the climate,resuming the vegetation and preventing the natural disasters. Normalized difference value vegetation index (NDVI) was used to estimate the vegetation coverage in different periods and draw the change grayness and change levels chart of Chengdu vegetation coverage. Data analysis results show that, from 1992 to 2009,the vegetation coverage in Chengdu was overall decreasing. The quantity of dense forest land,shrub land,high and middle grass and cultivated land was decreasing,in which the vegetation coverage decreased obviously from 1992 to 2001,the vegetation coverage remained reduced from 2001 to 2009,but the speed was slower than that from 1992 to 2001. In addition, the speckle distribution of artificial greenbelt appeared in the urban area,and the small-area climatic condition was improved continuously.
党青, 杨武年. 近20年成都市植被覆盖度动态变化检测及原因分析[J]. 国土资源遥感, 2011, 23(4): 121-125.
DANG Qing, YANG Wu-nian. Dynamic Supervision and Reason Analysis of Vegetation Coverage Changes of Chengdu in the Past 20 years. REMOTE SENSING FOR LAND & RESOURCES, 2011, 23(4): 121-125.
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2011, Vol. 23 
