Yield Class:
The potential productive capacity of a forest, measured in cubic metres per hectare per year. Yield classes are divided into steps of two cubic metres per hectare. Thus a stand of yield class 14 has a maximum mean annual increment of 14m3 per hectare per year.

GIS (Geographic Information Systems):
Geographic Information System is a computer system for the efficient input, storage, analysis and retrieval and representation of maps and related data.

Productive Forest Area:
This is the area solely occupied by trees, where deductions have been made for gaps in the canopy. The purpose of productive area estimation is to normalize mapped sub-compartment areas for production forecasting.

Windthrow Hazard Classification:
This is a measurement of windthrow risk and is an important factor in estimating site productivity.

Conifer species:
Corsican pine, Douglas fir, European larch, Grand fir, Japanese larch, Lawson cypress, Lodgepole pine (inland), Lodgepole pine (Lulu Island), Lodgepole pine North Coastal, Lodgepole pine South Coastal, Monterey cypress, Monterey pine, Noble fir, Norway spruce, Scots pine, Silver fir, Sitka spruce, Western hemlock, and Western red cedar.

Broadleaf species:
alder, ash, beech, birch, cherry, elm, hornbeam, oak, other broadleaves, poplar, spanish chestnut, and sycamore.