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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; in revised form: 7 August 2009 / Accepted: 11 August 2009 / Published: 25 August 2009
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
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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.
Stuckens J, Somers B, Verstraeten WW, Swennen R, Coppin P. Evaluation and Normalization of Cloud Obscuration Related BRDF Effects in Field Spectroscopy. Remote Sensing. 2009; 1(3):496-518.
Stuckens, Jan; Somers, Ben; Verstraeten, Willem W.; Swennen, Rony; Coppin, Pol. 2009. "Evaluation and Normalization of Cloud Obscuration Related BRDF Effects in Field Spectroscopy." Remote Sens. 1, no. 3: 496-518.