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All areas designated as forest according to the NFI forest definition. The forest definition includes shrub forest. The target variable "forest area" is also used when classifying the total area as forest or non-forest.

Ratio of the different damage events (e.g. wind, insects) which led to damage gaps. The ratio is determined on the basis of those damage gaps that account for at least 10% of the interpretation area (50 × 50 m) and on which, according to the information provided by the local forest services, only one damage event occurred. The target value thus allows comparisons of inventories from NFI3 onwards.

Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of living trees and shrubs (standing and lying) with a dbh ≥12 cm.

Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of all dead trees and shrubs (standing and lying) with a dbh ≥12 cm.

Sum of the stem cross-sectional areas at a height of 1.3 m (level for measuring diameter at breast height [dbh]) of all living and dead trees and shrubs (standing and lying) with a dbh ≥12 cm. The total basal area corresponds to the sum of the basal area and the deadwood basal area.

Length of the forest edge calculated on the basis of the forest boundary lines determined in the aerial photo.

Number of forest sample plots (Plots).

Number of stems of living trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm.

Number of stems of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm. The total number of stems is the sum of the number of stems and the number of deadwood stems.

Stemwood volume of standing dead trees and shrubs with a diameter at breast height (dbh) ≥12 cm less the volume of broken stem pieces, plus the volume of lying deadwood ≥7 cm in diameter (merchantable wood) without merchantable pieces in heaps of branches.

Volume of lying deadwood ≥7 cm in diameter (merchantable wood) without merchantable wood pieces in heaps of branches.

Stemwood volume of living trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark.

Stemwood volume of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark. The total wood volume is the sum of the growing stock and deadwood volumes.

Volume of stemwood of all dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark.