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Remote Sens. 2010, 2(8), 1918-1940; doi:10.3390/rs2081918
Article

Land Surface Albedos Computed from BRF Measurements with a Study of Conversion Formulae

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Received: 30 May 2010 / Revised: 11 June 2010 / Accepted: 25 June 2010 / Published: 12 August 2010
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Abstract

Land surface hemispherical albedos of several targets have been resolved using the bidirectional reflectance factor (BRF) library of the Finnish Geodetic Institute (FGI). The library contains BRF data measured by FGI during the years 2003–2009. Surface albedos are calculated using selected BRF datasets from the library. Polynomial interpolation and extrapolation have been used in computations. Several broadband conversion formulae generally used for satellite based surface albedo retrieval have been tested. The albedos were typically found to monotonically increase with increasing zenith angle of the Sun. The surface albedo variance was significant even within each target category / surface type. In general, the albedo estimates derived using diverse broadband conversion formulas and estimates obtained by direct integration of the measured spectra were in line.
Keywords: reflectance; albedo; climate; remote sensing; snow; vegetation; measurement; satellite; goniometer; spectrometer; FIGIFIGO reflectance; albedo; climate; remote sensing; snow; vegetation; measurement; satellite; goniometer; spectrometer; FIGIFIGO
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.

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Peltoniemi, J.I.; Manninen, T.; Suomalainen, J.; Hakala, T.; Puttonen, E.; Riihelä, A. Land Surface Albedos Computed from BRF Measurements with a Study of Conversion Formulae. Remote Sens. 2010, 2, 1918-1940.

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