Furthermore, forest inventory statistics have been applied. These statistics are based on forest plot data that are aggregated over regions in the Nomenclature of Territorial Units for Statistics (NUTS).
In areas with available national forest inventory data, area proportions covered by the 20 species were obtained by compositional kriging. For the rest of Europe a multinomial logistic regression model was fitted to ICP-level-I plots using various abiotic factors as predictors (soil, biogeographical zones, and bioindicators derived from temperature and precipitation data). The regression results were iteratively scaled to fit NUTS-II forest inventory statistics and the European Forest Map.
The predictions for the twenty tree species were validated using 230 plot data separated from the calibration.
Provided by:
Center for Earth Observation and Digital Earth,CASThe Lanzhou Branch of the National Science Library/The Scientific Information Center for Resources and Environment,CAS
