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An O2-A Band Atmospheric Correction Algorithm for Tower-based Platform based on Look-up Table |
Guo Jian1,2,Liu Liangyun1,2,Liu Xinjie2,Hu Jiaochan2,Jing Xia1 |
(1.College of Geomatics,Xi’an University of Science and Technology,Xi’an 710054,China;
2.Key Laboratory of Digital Earth Science,Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100094,China) |
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Abstract Tower-based spectral observation is an important connecting bridge between flux sites and satellite remote sensing data,and the effect of atmospheric absorption and scattering between horizontal surface and tower-based platform on the atmospheric absorption band such as O2-A is difficult to ignore.Firstly,the influence of atmospheric radiation transfer on the up-welling radiance and down-welling irradiance of the tower-based platform is analyzed,and the atmospheric correction method of based on upward and downward transmittance is established,that is,the influence of the upwelling radiance and down-welling irradiance is corrected by the direct transmittance and the total transmittance.Secondly,using the simulation data of MODTRAN model,the influence of AOD550 and radiative transfer path length on atmospheric transmittance is quantitatively analyzed,and the LUT of AOD550 is established based on the ratio of down-welling irradiance of near-infrared and red bands and solar zenith angle,as well as the upward and downward atmospheric transmittance LUT based on the AOD550 and the radiative transfer path length.Finally,using the canopy spectral data of different growth stages observed by the tower-based platform,the difference of the apparent reflectance between the inside and outside of the O2-A band absorption line before and after atmospheric correction was analyzed.The results show that the atmospheric correction method based on LUT of AOD550 and radiative transfer path length proposed in this paper can better correct the influence of upwelling radiance and down-welling on the O2-A absorption band of the tower-based platform,and provides important method support for applications such as SIF observation on the tower platform.
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Received: 22 November 2018
Published: 01 July 2019
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