基于EOS/MODIS数据的NDVI与EVI比较研究  

Comparison of NDVI and EVI based on EOS/MODIS data

作　　者：李红军[1] 郑力[1] 雷玉平[1] 李春强 周戡[3] 

机构地区：[1]中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄050021 [2]河北省气象科学研究所,石家庄050021 [3]国家林业局,北京100714

出　　处：《地理科学进展》2007年第1期26-32,共7页Progress in Geography

基　　金：中科院知识创新工程重要方向项目(KSCXZ-YW-N-037和KZCX3-SW-446);河北省节水农业重点实验室开放基金项目(0508021-HBKLA-01)

摘　　要：作为NOAA/AVHRR归一化植被指数(NDVI)的延续和发展,EOS/MODIS归一化植被指数(NDVI)和增强植被指数(EVI)在许多领域得到广泛应用。应用数理统计和地统计学方法对二者进行的对比研究表明:NDVI在植被生长旺盛期容易达到饱和,而EVI则能克服这一现象,比较真实地反映植被的生长变化过程;相同空间分辨率下,EVI取值范围、标准差与变异系数均高于NDVI,NDVI数据比较均一,其空间相关性高于EVI,EVI更能反映研究区域内植被空间差异。As the continuation and development of NOAA/AVHRR NDVI, the normalized difference vegetation index （NDVI） and enhanced vegetation index （EVI） of MODIS have been comprehensively used in many fields. In order to investigate the difference between NDVI and EVI derived from MODIS, comparative study of these two vegetation indices was conducted by statistics and geo-statistic methods （semi-variance function）. By the comparison of the two kinds of vegetation index distribution maps in different period, it is demonstrated that EVI improve the sensitivity for well-vegetated areas where NDVI is saturated when plants grow well, which will be helpful in monitoring plants growth status. At same resolution, i.e. 250m, 500m and 1000m, by means of the geo-statistics, the results show that range, variance and variation coefficient of EVI is higher than that of NDVI, the value of NDVI is even, and its spatial relativity is higher than that of EVI, which all show that EVI is more sensitive to the spatial heterogeneity of plants in research area.

关 键 词：MODIS 归一化植被指数(NDVI) 增强植被指数(EVI) 对比 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]