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Remote Sensing Technology and Application  2004, Vol. 19 Issue (6): 508-512    DOI: 10.11873/j.issn.1004-0323.2004.6.508
    
A Simplified Surface Albedo Inverse Model with MODIS Data
LIU Zhen-hua, ZHAO Ying-shi, SONG Xiao-ning
(The Graduate School,Chinese Academy of Sciences,South China AgriculturalUniversity,Beijing100039,China)
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Abstract  

Land surface albedo, which is a fundamental component needed for determining the radiation balanceof the Earth-atmosphere system, is the surface hemispherical reflectivity integrated over the solar spectrum.Briefly said, it is the ratio of the total upwelling irradiance to the total downward irradiance. Given the limit ofexperiment field and instrument equipment, it is very difficult to obtain a great deal of surface measured data.Thereof, in our research, from the point of view that surface albedos are the ratio of flux, surface albedos canbe reversed with less calibrated field synchronous observed data.During the conversion process of surface albdeos, the first is to obtain surface reflectance from remotelysensed data, which can be completed by running 6S atmospheric radiative transfer model; the second is to re-verse surface narrowband albedos, which is fulfilled by MODTRAN model. The outputs of MODTRAN simu-lations are upwelling and downwelling irradiance. The sensor spectral response functions are integrated withthese outputs to generate narrowband albedos; the third is to calculate surface broadband albedos, which is fo-cused on determining the converting coefficients from narrowbands to broadbands under the the linear relation-ship between narrowband albedos and broadband albedos. The spectral distribution of solar irradiance at thesurface is set as the weighting function for comverting the narrowband albedos to broadband albedos in the re-search. The conversion of broadband albedos is fulfilled finally. The simplified surface broadband albedo reversemodel is tested for the west of Inner Mongolia using MODIS image data and synchronous observed surface spec-tral data based on the above conversion algorithm. The results show that the method is convenient and feasibleunder a specific surface/atmospheric condition.

Key words:  Albedo      MODIS      MODTRAN      Surface upwelling       downward irradiance     
Received:  27 November 2003      Published:  26 December 2011
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Cite this article: 

LIU Zhen-hua, ZHAO Ying-shi, SONG Xiao-ning. A Simplified Surface Albedo Inverse Model with MODIS Data. Remote Sensing Technology and Application, 2004, 19(6): 508-512.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2004.6.508     OR     http://www.rsta.ac.cn/EN/Y2004/V19/I6/508

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