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

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

1,* , 1
,
1
,
2
 and
1
1 M3 BIORES, K.U. Leuven, de Croylaan 34, 3001 Leuven, Belgium 2 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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Abstract

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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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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