J4 ›› 2007, 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'ecti0n 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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