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Calculation of albedo on complex terrain using MODIS data: a case study in Taihang Mountain of China

文献类型： 外文期刊

作者： Li, Hongjun 1 ; Shen, Yanjun 1 ; Yang, Pingguo 2 ; Zhao, Wenguang 3 ; Allen, Richard G. 3 ; Shao, Hongbo 4 ; Lei, Yupi 1 ;

作者机构： 1.Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Key Lab Agr Water Resources, Shijiazhuang 050022, Peoples R China

2.Shanxi Normal Univ, Coll Life Sci, Linfen 041000, Peoples R China

3.Univ Idaho, Kimberly Res & Extens Ctr, Kimberly, ID 83341 USA

4.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Biol & Bioresources Utilizat, Yantai 264003, Peoples R China

5.Jiangsu Acad Agr Sci, Inst Agrobiotechnol, Nanjing 210014, Jiangsu, Peoples R China

关键词： Albedo;Atmospheric correction;Reflectance;Weighting coefficients;Mountain areas

期刊名称：ENVIRONMENTAL EARTH SCIENCES （ 影响因子：2.784； 五年影响因子：2.867 ）

ISSN： 1866-6280

年卷期： 2015 年 74 卷 7 期

页码：

收录情况： SCI

摘要： Albedo is one of the import parameters for the routine applications of various remote sensing models, and most methods for estimating albedo are only applicable in plain areas with relatively flat topography. Due to the existence of the undulant terrain in mountain areas, the incoming radiance can be decomposed into beam, diffuse, and terrain radiance, which are affected by atmospheric transmittance, solar zenith and azimuth angles, terrain slope and aspect, etc. The existence of partial shadow in low-resolution pixel makes the calculation of albedo more complicated in the mountain areas. This paper presents a rapid and operational method for estimating albedo on complex terrain using high-resolution Digital Elevation Model (DEM) and MODerate-resolution Imaging Spectroradiometer (MODIS) data with sensor view angles less than 20. Shadow coverage ratio of the low-resolution map was retrieved from high-resolution shadow map, and was used for the correction of beam radiance. The parameters used for the atmospheric correction of narrowband beam radiance and weighting coefficients for the calculation of broadband albedo using MODIS with and without band 5 were developed based on the SMARTS2 simulation under different atmospheric conditions. Taken the Taihang Mountain in the North China as the study area, the calculated reflectance and albedo were compared with the MODIS reflectance and albedo products. The maximum deviations between estimated and blue-sky albedos were 0.0155 and +0.0151 in plain areas, and 0.00667 and 0.01747 in the mountain areas, respectively. Good agreements indicate that the procedure presented in this paper is applicable for the albedo calculation in the mountain areas using MODIS images and high-resolution DEM.

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