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

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

1
Finnish Geodetic Institute, P.O. box 14, FI-02431 Masala, Finland
2
Finnish Meteorological Institute, Earth Observation, P.O. Box 503, FI-00101 Helsinki, Finland
*
Author to whom correspondence should be addressed.
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 (CC BY 3.0).

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MDPI and ACS Style

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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