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Remote Sensing Technology and Application
    
Simulation and Analysis on the Influence of Soil Background of Wheat Farmland on NDVI under Different Vegetation Coverage
Fang Yuchen1,2,3,Wang Peiyan1,2,3,Tian Qingjiu1,2,3
(1.International Institute for Earth System Science,Nanjing University,Nanjing 210023,China;
2.Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology,
Nanjing 210023,China;3.Jiangsu Provincial Collaborative Innovation Center of GeographicInformation Resources Development and Utilization,Nanjing210023,China)
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Abstract  It is quite confusing to effectively monitor and precisely evaluate growing conditions of wheat by using normalized differential vegetation index (NDVI)which is based on pixel scale as they are significantly different when acquired by the same growth status wheat with different background of soil types.This paper selects 9 typical soil types in our country as background with the wheat canopy spectrum is fixed which means the NDVIc is a constant value to study the influence of different soil background types on NDVI of wheat and analyze the sensitivity of NDVI of wheat to the vegetation coverage simulated by diverse liner mixed ratio of wheat canopy and soil background.The results show that:(1)wheat NDVI of farmland increases along with the increase of vegetation coverage under the same of soil background type,and vice versa;(2)wheat NDVI of farmland vary greatly with different soil background types,and the difference decrease while the vegetation coverage exceed 25%;(3)NDVI sensitivity also shows a quite difference to vegetation coverage under the diverse soil background types.With the increase of vegetation coverage,NDVI sensitivity decreases with the lower\|reflectance soil background while it increases monotonously with the higher reflectance soil background.It provides the foundation for the times of calculating the remote sensing’s NDVI information of all wheat growing periods under different types of soil background.
Key words:  NDVI      Spectra      Wheat      Soil      Vegetation coverage     
Received:  03 August 2016      Published:  13 September 2017
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Cite this article: 

. Simulation and Analysis on the Influence of Soil Background of Wheat Farmland on NDVI under Different Vegetation Coverage. Remote Sensing Technology and Application, 2017, 32(4): 660-666.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2017.4.0660     OR     http://www.rsta.ac.cn/EN/Y2017/V32/I4/660

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