High-spectral resolution data for monitoring Scots pine (Pinus sylvestris L.) regeneration
High-resolution field spectroradiometric measurements were used to investigate the spectral properties of naturally regenerating Scots pine ( Pinus sylvestris L.) in relation to sapling cover and season. Ratios of reflectance (R757/ R722) and first-derivative reflectance (D719/ D703 and D730/ D700) in the red edge region correlated most strongly with increasing sapling cover. The main control on these ratios was the contrast between the biomass of heather and pine saplings. At the site investigated, the strength of the correlation of reflectance ratios with sapling cover was not affected by seasonal changes in canopy colour.