Evaluation of Biophysical Parameters and Temporary Space Change in an Arid City of Northwestern Mexico
Evaluation of Biophysical Parameters and Temporary Space Change in an Arid City of Northwestern Mexico作者机构：Faculty of Engineering Autonomous University of Baja California Mexicali 21280 Mexico Engineering Institute Universidad Aut6noma de Baja California Mexicali 21280 Mexico Faculty of Architecture Autonomous University of Baja California Mexicali 21280 Mdxico
出 版 物：《Journal of Environmental Science and Engineering(B)》 (环境科学与工程（B）)
年 卷 期：2013年第2卷第9期
页 面：507-513页
学科分类：08[工学] 081402[工学-结构工程] 09[农学] 081304[工学-建筑技术科学] 0901[农学-作物学] 0813[工学-建筑学] 0814[工学-土木工程]
主 题：NDVI blackbody temperature albedo Mexicali city.
摘 要：Through an analysis of Landsat multispectral images of visible, thermal and near-infrared bands, the spatiotemporal change of biophysical parameters： NDVI （normalized difference vegetation index）, blackbody temperature and albedo, were estimated for Mexicali city, using principal component analysis and time series. The satellite images correspond to the dates： April 6, 1993; May 3, 2000; May 12, 2003; May 17, 2008 and May 26, 2011; the results reveal a change in relation to urban growth. In 1993, the vegetation was 20% and in 2011 it decreased to 3.8%. The blackbody temperature increased from 34.0 ℃ to 41.0 ℃ and albedo decreased by 0.37 compared to 1993. The most deteriorated area appears in surroundings of the city because of the change in the vegetation cover by the urban elements.
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