J4 ›› 2008, Vol. 25 ›› Issue (1): 38-43.

• 论文 • 上一篇    下一篇

西北地区MODIS/NDVI与MODIS/EVI对比分析

杨嘉1,2郭铌2贾建华1   

  1. 1.西安科技大学测量工程系,陕西西安710054; 2.中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020
  • 收稿日期:2007-01-22 修回日期:2007-03-06 出版日期:2007-03-31 发布日期:2007-03-31
  • 作者简介:杨嘉(1981一),女,硕士研究生,主要研究方向为遥感与地理信息
  • 基金资助:

    国家自然基金项目(40375011)资助

Comparison Between M ODIS/NDVI and M ODIS/ EVI in Northwest China

YANG Jia 1,2GUO Ni 2,JIA Jianhua1   

  1. 1.Department ofSurvey Engineering,Xi’an University ofScience and Technology,Xi,an 710054,China;2.Key Laboratory ofArid Climatic Change and Reducing Disaster ofGansu Province,Key Open Laboratory of Arid Climate Change and Disaster Reduction ofCMA,Institute ofArid Meteorology,CMA,Lanzhou 730020,China
  • Received:2007-01-22 Revised:2007-03-06 Online:2007-03-31 Published:2007-03-31

摘要:

为了了解西北地区MODIS/NDVI和MODIS/EVI 2种植被指数的特点,利用2003年植被生长期TERRA/MODIS资料和西北地区植被类型数据,分析了西北地区MODIS/NDVI和MODIS/EVI空间分布特征和不同类型植被随时间变化特征,比较了大气订正对NDVI和EVI的影响。结果表明:NDVI和EVI空间分布格局一致,与降水空间分布形式比较一致。NDVI与EVI值的差异随着植被覆盖度的增加而增大。不同类型植被NDVI和EVI变化特征一致。大气对NDVI和EVI的影响较大,大气订正前许多地区NDVI值小于EVI值。大气订正使NDVI增大,EVI减小,大气订正后NDVI值普遍大于EVI值。通过对大气气溶胶粒子较多地区的NDVI和EVI值的对比分析,EVI具有较好的抗大气气溶胶的作用。

关键词: MODIS, 大气订正, NDVI, EVI

Abstract:

Using TERRA /MODIS data in some typical vegetation regions during plant growth period in 2003 and vegetation type data,the sDatial and temporal characteristics of MODIS/NDVI and MODIS/EVI in Northwest China an d the influences of atmosphere con'ec-ti0n on the two vegetation indexes were an alyzed in this paper for comparing the diferences between NDVI and EVI.The results show that distributi0ns of NDVI an d EVI are consistent in space and nearly the same as that of precipitation.Th e diference between NDVI and EVI is larger as vegetation coverage increases.In addition.the infl uence of atmosphere on NDVI and EV1 was obvious,and atmos-DheIle c0n.ecti0n made NDVI values increase and EVI values reduce;the values of NDVI are smaller than those of EVI before atmos--DheIle c0rrecti0n:while after the correction,values of NDVI are larger than those of EVI in most regions. By comparing NDVI and EVI in th0se regi0ns containing more aerosols.we found that EVI had a good performance in removing the infl uence 0l aerosols.

Key words: MODIS, atmosphere correction, NDVI, EVI

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