Aerosol Optical Retrieval and Surface Reflectance from Airborne Remote Sensing Data over Land

被引:23
作者
Bassani, Cristiana [1 ]
Cavalli, Rosa Maria [1 ]
Pignatti, Stefano [2 ]
机构
[1] Italian Natl Res Council, CNR, Inst Atmospher Pollut IIA, Div Ariborne Lab Environm Res LARA,Res Area Roma, I-00133 Rome, Italy
[2] Italian Natl Res Council, Inst Methodol Environm Anal IMAA, CNR, I-85050 Potenza, Italy
关键词
atmospheric radiative transfer; aerosol optical thickness; atmospheric correction; hyperspectral remote sensing; reflectance; remote sensing; ATMOSPHERIC CORRECTION; MODIS DATA; THICKNESS; AERONET; NETWORK; EUROPE; SUN;
D O I
10.3390/s100706421
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Quantitative analysis of atmospheric optical properties and surface reflectance can be performed by applying radiative transfer theory in the Atmosphere-Earth coupled system, for the atmospheric correction of hyperspectral remote sensing data. This paper describes a new physically-based algorithm to retrieve the aerosol optical thickness at 550nm (tau(550)) and the surface reflectance (rho) from airborne acquired data in the atmospheric window of the Visible and Near-Infrared (VNIR) range. The algorithm is realized in two modules. Module A retrieves tau(550) with a minimization algorithm, then Module B retrieves the surface reflectance rho for each pixel of the image. The method was tested on five remote sensing images acquired by an airborne sensor under different geometric conditions to evaluate the reliability of the method. The results, tau(550) and rho, retrieved from each image were validated with field data contemporaneously acquired by a sun-sky radiometer and a spectroradiometer, respectively. Good correlation index, r, and low root mean square deviations, RMSD, were obtained for the tau(550) retrieved by Module A (r(2) = 0.75, RMSD = 0.08) and the rho retrieved by Module B (r(2) <= 0.9, RMSD <= 0.003). Overall, the results are encouraging, indicating that the method is reliable for optical atmospheric studies and the atmospheric correction of airborne hyperspectral images. The method does not require additional at-ground measurements about at-ground reflectance of the reference pixel and aerosol optical thickness.
引用
收藏
页码:6421 / 6438
页数:18
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