Influence of the partially polarized natural light on the spectral ground truth measurements

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Authors
  1. Lévesque, M.P.
  2. Dissanska, M.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN)
Abstract
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.

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Keywords
polarization;spectrum;calibration;remote sensing
Report Number
DRDC-RDDC-2016-R161 — Scientific Report
Date of publication
01 Jun 2016
Number of Pages
28
DSTKIM No
CA043253
CANDIS No
804552
Format(s):
Electronic Document(PDF)

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