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| Measurement set-up for Scots pine. Spectrometer and LED light source are mounted in nadir and off-nadir positions respectively above top of canopy. Measurements are carried out at night, which enables the measurement of canopy scale spectra in situ without the reflected contribution of the target contaminating the measurement. Note that in the measurements presented in this study, the tree canopy was not a single isolated crown but belonged to a semi-closed continuous cover forest. |
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