This study accurately mapped 16 dominant tree species/genera in Poland using Sentinel-2 observations from short periods in spring, summer, and autumn (2018–2021). The classification achieved 80 %+ accuracy in country-wide forest species mapping, with variation based on species, region, and observation frequency. Freely accessible resources, including the forest tree species map and training/test data, can be found at:
https://doi.org/10.5281/zenodo.10180469.