Stand Age Class to Size Class Crosswalk by Forest Type Group in Minnesota, USA

Many forestry models require the input of stand size class information, a variable with multiple definitions across forest inventories. This work describes crosswalk between age and for several type groups in Minnesota to facilitate consistency availability latter information. Refinements include ratio adjustments that redistribute number plots (or hectares) from one estimated another, based on known error rates. The results showed 61.9% all were correctly classified, 95.5% within class. Correct classifications individual type/size combinations ranged 16.7–79.2%. Applying validation dataset produced percent errors −46.4% 49.4%, but adjustment, dropped −20.1% 14.4%. These suggest provide coarse, yet reasonable, substitute using more complex classification methodologies, particularly when forecasting future conditions.