To create consistent spectral data for evaluating geographical, chrono
logical, and environmental differences or events in main Scots pine po
pulations in Finland and Sweden, reflectance spectra from randomly sam
pled single pine individuals (N = 2069) were measured. The spectra wer
e recorded in 1991-1993 during and after the growing season by using a
mobile spectroradiometer working in the 390-1070 nm wavelength range.
The spectral data was processed by using three independent statistica
l pattern recognition methods. Typical spectral shape differences betw
een the growing seasons were observed due to the obvious phenological
phase shift from year to year. This was verified by the observed diffe
rences inside the growing season. Longitudinal distinguishing characte
ristics of the pine spectra were greater than latitudinal ones. We are
also able to classify pines growing in polluted and less polluted env
ironments to the corresponding classes.