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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.

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 dead trees and shrubs (standing and lying) with a dbh ≥12 cm according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable.

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.

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 according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable. The total basal area NFI1 corresponds to the sum of the basal area and the deadwood basal area NFI1.

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

Measure of the density of a stocking calculated from the number of stems per hectare (in NFI trees and shrubs with a diameter at breast height [dbh] ≥12 cm) and the mean diameter. With a callipering threshold of 0 cm, the SDI is largely independent of the site quality, tree species composition and stand age.

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.

Number of stems of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable. The total number of stems NFI1 is the sum of the number of stems and the number of deadwood stems NFI1.

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.

Stemwood volume of all living and dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark according to the method used in NFI1. In NFI1, dead trees were only included if their wood was still usable.

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

Stemwood volume of all dead trees and shrubs (standing and lying) with a diameter at breast height (dbh) ≥12 cm with bark recorded according to the NFI1 method. In NFI1, dead trees were only included if their wood was still usable. In addition, lying but still green trees were classified as deadwood.

Measure for the ecological assessment of forest stands, derived from the number of woody species with a diameter at breast height (dbh) ≥12 cm and the occurrence of woody species of special ecological significance (willows, birches, alders, native poplars, oaks, chestnut, cherry, wild fruit and Sorbus species) in the upper layer.

Number of species of trees and shrubs that occur within the 200 m² circle on the sample plot with at least one living individual ≥40 cm high.