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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.

Forest area classified according to its functions (including "no special forest function"), as determined in the interview survey with the local forest services. A forest area can fulfil several forest functions at the same time, and can thus contribute to the forest area of several forest functions.

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 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.

Dry weight (mass) of standing and lying deadwood, determined with the help of the species- and decomposition-dependent wood densities of the following components: 1) stemwood, merchantable branchwood, branch brushwood and roots of standing and lying dead trees and shrubs with a diameter at breast height (dbh) ≥12 cm without stem breakage; 2) stemwood of the still standing stump, branch brushwood and roots of standing dead trees and shrubs ≥12 cm dbh with stem breakage and 3) LIS-deadwood, i.e. the lying deadwood with a diameter ≥7 cm (merchantable wood without merchantable wood pieces in heaps of branches), which cannot be assigned to a tree or shrub ≥12 cm dbh.

Dry weight (mass) of the so-called LIS deadwood, i.e. lying deadwood with a diameter ≥7 cm (merchantable wood; excluding merchantable wood pieces in heaps of branches), which cannot be assigned to a tree or shrub with a diameter at breast height (dbh) ≥12 cm. The mass is determined with the help of species- and decomposition-dependent wood densities.

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.

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.

Wood volume of the stem without bark or stump ≥7 cm in diameter (limit for merchantable wood) of all trees and shrubs with a diameter at breast height (dbh) ≥12 cm, based on the stem-form functions according to Kaufmann (2001). The definition of the assortments is based on the 2010 edition of the Swiss trading customs for raw timber (HG 2010).

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.