[Remote sensing estimation of vegetation coverage in guangzhou based on the correction of atmospheric radiation].
Vegetation coverage is a basic parameter in describing landscape ecosystem, and an important index in assessing ecosystem health and security. Based on the four TM images in 1990, 1995, 2000 and 2005, and by using the correction model to deduct atmospheric radiation effect and the spatial operating model for TM image under unsupervised classification, the relationship model between vegetation coverage and normalized vegetation index was established, and the vegetation coverage in different phases in Guangzhou was calculated. The results showed that the vegetation coverage in Guangzhou decreased continuously from 1990 to 2000 but began to increase thereafter, which accorded with the economic development and environmental construction of the city. The model established in this paper could simulate well the dynamics of regional vegetation cover, and have the advantage in describing the dynamics of vegetation coverage more accurately, being available to the assessment of urban eco-environmental quality and its dynamic characters.
Gong
Jian-Zhou
JZ
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China. gongjzh66@126.com
Xia
Bei-Cheng
BC
D001272:Atmosphere; D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004777:Environment; D040362:Geographic Information Systems; D006109:Poaceae / Q000254:growth & development*; D011827:Radiation; D017215:Satellite Communications; D012987:Soil / Q000032:analysis; D014197:Trees / Q000254:growth & development*
D012987:Soil