00000nam 2200000za 4500 9.855430 CaOODSP 20240219183502 cr ||||||||||| 180418s2016 oncado| o f000 0 eng d CaOODSP eng eng fre n-cn--- D68-2/161-2016E-PDF Lévesque, Martin, 1958- Influence of the partially polarized natural light on the spectral ground truth measurements [electronic resource] / Martin P. Lévesque, Maria Dissanska. [Ottawa] : Defence Research and Development Canada, 2016. iv, 20, [2] p. : col. ill. Scientific report ; 2016-R161 "June 2016". Includes bibliographic references. "In previous works, it was found that the polarization alters the spectrometers spectral response. Considering that the natural light is always partially polarized (reflection, Rayleigh scattering, etc.), some concerns were raised about the accuracy and variability of the outdoor measurement, particularly for trial ground truth measurements. This report demonstrates that, in some circumstances, the measurement can be affected by the polarization; direct sun reflection and reflection from close objects must be avoided. However, measuring surfaces at right angle (as suggested in usual calibration procedure) minimized the alteration of the spectral response of the sensors. Hence, by respecting rigorously the measurement protocol, the ground truth data is valid. But, ground truth measurements acquired with a slant-path angle are more or less accurate; an important proportion of the signal variability is due to the polarization"--Abstract, p. i. Includes abstract in French. gccst Scientific research Dissanska, Maria. Defence R&D Canada. Scientific report (Defence R&D Canada) 2016-R161 (CaOODSP)9.802305 PDF 2.76 MB https://publications.gc.ca/collections/collection_2018/rddc-drdc/D68-2-161-2016-eng.pdf