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Remote Sens. 2009, 1(3), 496-518; doi:10.3390/rs1030496

Evaluation and Normalization of Cloud Obscuration Related BRDF Effects in Field Spectroscopy

M3 BIORES, K.U. Leuven, de Croylaan 34, 3001 Leuven, Belgium
Division of Crop Biotechnics, K.U. Leuven, Kasteelpark Arenberg 13, 3001 Leuven, Belgium
Author to whom correspondence should be addressed.
Received: 1 July 2009 / Revised: 7 August 2009 / Accepted: 11 August 2009 / Published: 25 August 2009
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The impact of target bidirectional reflectance in dual field of view spectroscopy was described and quantified using field measurements and ray-tracing simulations. A data-driven normalization method was developed to convert reflectance factors under cloud obscured conditions into clear sky reflectance by decomposing the target bidirectional reflectance into an isotropic target-specific component and a group-specific bidirectional component. An evaluation on tree, grass and gravel targets suggests a reduction in relative reflectance error obtained by normalization from 15% to less than 5% between 400 and 1800 nm. At higher wavelengths a decreased signal-to-noise ratio increases the errors.
Keywords: dual field-of-view; spectroradiometer; hyperspectral; BRDF; clouds; obscuration dual field-of-view; spectroradiometer; hyperspectral; BRDF; clouds; obscuration
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

Stuckens, J.; Somers, B.; Verstraeten, W.W.; Swennen, R.; Coppin, P. Evaluation and Normalization of Cloud Obscuration Related BRDF Effects in Field Spectroscopy. Remote Sens. 2009, 1, 496-518.

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