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

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

Content Provider	MDPI
Author	Bassani, Cristiana Cavalli, Rosa Maria Pignatti, Stefano
Abstract	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 (τ550) and the surface reflectance (ρ) 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 τ550 with a minimization algorithm, then Module B retrieves the surface reflectance ρ 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, τ550 and ρ, 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 τ550 retrieved by Module A (r2 = 0.75, RMSD = 0.08) and the ρ retrieved by Module B (r2 ≤ 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.
File Size	1907712
Ending Page	6438
Page Count	18
Starting Page	6421
File Format	PDF
e-ISSN	14248220
DOI	10.3390/s100706421
Journal	Sensors
Issue Number	7
Volume Number	10
Language	English
Publisher Date	2010-06-30
Access Restriction	Open
Subject Keyword	atmospheric radiative transfer aerosol optical thickness atmospheric correction hyperspectral remote sensing reflectance remote sensing
Content Type	Text
Resource Type	Article

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