A dataset of stem bark reflectance spectra for boreal and temperate tree species
The dataset includes stem bark reflectance spectra of ten boreal and temperate tree species. The data were measured using a Specim IQ imaging spectrometer that operates in the visible and near-infrared wavelength region (400–1000 nm). Measurements were made in the Greater Helsinki area in Finland, and in Järvselja in Estonia. The average reflectance spectrum for each of the ten common boreal and temperate tree species was calculated from 20 samples per species. The sampled species were: Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) Karst), silver birch (Betula pendula Roth), grey alder (Alnus incana (L.) Moench), black alder (Alnus glutinosa (L.) Gaertn.), English oak (Quercus robur L.), European aspen (Populus tremula L.), European ash (Fraxinus excelsior L.), Norway maple (Acer platanoides L.), and littleleaf linden (Tilia cordata Mill.).
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Stem bark reflectance spectra were measured at the height of 1.3 meters with a Specim IQ hyperspectral camera. Measurement distance was 20 centimeters. For normalization of the measured spectra, an image taken of a Spectralon white reference panel before the bark measurement was used.