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Repositorio de la Universidad de Oviedo > Producción Bibliográfica de UniOvi: RECOPILA > Artículos >

Use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10651/36362

Título : A New Method for the Estimation of Broadband Apparent Albedo Using Hyperspectral Airborne Hemispherical Directional Reflectance Factor Values
Autor(es) y otros: Fernández Calleja, Javier Jesús
Recondo González, María del Carmen
Peón García, Juan José
Fernández Menéndez, Susana del Carmen
Cruz, Fernando de la
González-Piqueras, José
Palabras clave: broadband albedo
HDRF
validation
AHS
Fecha de publicación : feb-2016
Editorial : MDPI
Versión del editor: http://dx.doi.org/10.3390/rs8030183
Citación : Remote Sens 2016, 8, 183 (2016); doi:10.3390/rs8030183
Descripción física: 29 p.
Resumen : The broadband albedo values retrieved from satellite sensors are usually compared directly to ground measurements. Some authors have noted the necessity of high spatial resolution albedo estimates to fill the gap between ground measurements and satellite retrievals. In this respect, hyperspectral airborne data with high spatial resolution is a powerful tool. Here, a new operational method for the calculation of airborne broadband apparent albedo over the spectral range of 350–2500 nm is presented. This new method uses the Hemispherical Directional Reflectance Factor (HDRF) as a proxy for the narrowband albedo, assuming a Lambertian approximation. The broadband apparent albedo obtained is compared to that estimated using theapparent albedo equation devised for the Moderate Resolution Imaging Spectroradiometer (MODIS). Airborne data were collected using the Airborne Hyperspectral Scanner (AHS). Field data were acquired at three sites: a camelina field, a green grass field, and a vineyard. The HDRF can be used to approximate the narrowband albedo for all View Zenith Angle (VZA) values for flights parallel to the solar principal plane (SPP); for flights orthogonal to the SPP, discrepancies are observed when the VZA approaches -45º. Root Mean Square Error (RMSE) values in the range 0.009–0.018 were obtained using the new method, improving upon previous results over the same area (RMSEs of 0.01–0.03). The relative error in the albedo estimation using the new method is 12% for -36.2º < VZA < 40.8º in the case of flights parallel to the SPP and less than 15% for -13º < VZA < 45º and 45% for VZA = -45º for flights orthogonal to the SPP. The good performance of the new method lies in the use of the at-surface solar irradiance and the proposed integration method.
URI : http://hdl.handle.net/10651/36362
ISSN : 2072-4292
Aparece en las colecciones: Física
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