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Remote Sens. 2016, 8(3), 183; doi:10.3390/rs8030183

A New Method for the Estimation of Broadband Apparent Albedo Using Hyperspectral Airborne Hemispherical Directional Reflectance Factor Values

1
Departamento de Física, Universidad de Oviedo, Calvo Sotelo s/n, 33007 Oviedo, Spain
2
Área de Ingeniería Cartográfica, Geodésica y Fotogrametría, Departamento de Explotación y Prospección de Minas, Universidad de Oviedo, Gonzalo Gutiérrez Quirós s/n, 33600 Mieres, Spain
3
Instituto de Recursos Naturales y Ordenación del Territorio (INDUROT), Universidad de Oviedo, Gonzalo Gutiérrez Quirós s/n, 33600 Mieres, Spain
4
Departamento de Geología, Universidad de Oviedo, Jesús Arias de Velasco s/n, 33005 Oviedo, Spain
5
Instituto Técnico Agronómico Provincial (ITAP), Polígono Industrial Campollano, Avda.2ª, No. 42B, 02007 Albacete, Spain
6
Instituto Desarrollo Regional (IDR), Grupo Teledetección y SIG, Universidad Castilla La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Eyal Ben-Dor, Magaly Koch and Prasad S. Thenkabail
Received: 15 July 2015 / Revised: 4 February 2016 / Accepted: 14 February 2016 / Published: 25 February 2016
(This article belongs to the Special Issue Field Spectroscopy and Radiometry)
View Full-Text   |   Download PDF [9750 KB, uploaded 25 February 2016]   |  

Abstract

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 −45°. 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 −36.2° < VZA < 40.8° in the case of flights parallel to the SPP and less than 15% for −13° < VZA < 45° and 45% for VZA = −45° 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. View Full-Text
Keywords: broadband albedo; HDRF; validation; AHS broadband albedo; HDRF; validation; AHS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Calleja, J.F.; Recondo, C.; Peón, J.; Fernández, S.; de la Cruz, F.; González-Piqueras, J. A New Method for the Estimation of Broadband Apparent Albedo Using Hyperspectral Airborne Hemispherical Directional Reflectance Factor Values. Remote Sens. 2016, 8, 183.

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