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Topic
Classification
(25)
Altitude above sea level in classes of 400 m. Reference: Digital height model DHM 25 from Swisstopo
(119)
Altitudinal vegetation belts in the system used in the guidelines for monitoring the sustainability and performance of protection forests (NaiS; Frehner et al. 2005), reduced to six classes. The variable represents a simplification of the NaiS altitudinal vegetation belts with ten classes (NAISHSTKOMB) in which the classes «hyperinsubric» and «colline» are merged with «colline with beech» to form the class «hyperinsubric and colline» and the class «lower montane» with «upper montane» and «lower/upper montane» to form the class «lower and upper montane». The information is based on the altitudinal vegetation belts determined by experts (accessible forest sample plots of NFI4 on the 1.4-km network; Arge Frehner et al. 2020), as well as on the altitudinal vegetation belts modelled for the period 1981-2010 (other sample plots; Zischg et al. 2021). n/a: located above the forest boundary modelled by Zischg et al. and sometimes in the area of lakes, which were relatively roughly cut out by Zischg et al.
(12)
Sample plots without/with gaps ≥100 m² from canopy edge to canopy edge that intersect with the interpretation area (50 × 50 m), classified according to the area of the largest gap into five classes. Reference: aerial photo interpretation
(15)
Measure of inter-tree crowding of the tree crowns in a stand. Reference: Field Survey (MID 266: Schlussgrad)
(24)
Proportion of the ground area covered by tree crowns according to the aerial photo interpretation – in five 20-percent classes. The percentage is calculated using the 25 grid points on the interpretation area (50 × 50 m). Reference: aerial photo interpretation
region
(234)
Demarcation of Switzerland used in NFI for protective forest analyses. The six protective forest regions were derived from the economic regions by combining individual regions according to natural and statistical criteria.
evaluation area
(234)
Accessible forest without shrub forest («a.f.w.s.f.»), i.e. forest that is less than two-thirds covered with shrubs and can be accessed on foot, which is situated in a forest that the cantons designated «protective forest» in 2022 according to the harmonised criteria of SilvaProtect-CH (Losey & Wehrli 2013).
grid
(58)
Sub-grids 1, 2, 3, 4 and 5 of 9 on the sampling grid with a mesh size of 1.4 km (base grid).
(176)
NFI's sampling grid with a mesh size of 1.4 km. The 1.4-km grid is the grid size covering all the previous terrestrial Inventories, which is why it is also called the base grid.
LFI5 2018/26
protective forest region
forest area
altitude (in 400 m classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
1000 ha
LFI5 2018/26
protective forest region
forest area
altitudinal vegetation belts (NaiS; 6 classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
1000 ha
LFI5 2018/26
protective forest region
forest area
forest type (12 classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
1000 ha
LFI5 2018/26
protective forest region
forest area
slope (in 20% classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
1000 ha
LFI5 2018/26
protective forest region
forest area
time of last treatment (in 10-year classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
1000 ha
LFI5 2018/26
protective forest region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·degree of cover (aerial photo, 5 classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
subtotal, %
1000 ha
LFI5 2018/26
protective forest region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·degree of cover of established regeneration
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
subtotal, %
1000 ha
LFI5 2018/26
protective forest region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·regeneration cover
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
subtotal, %
1000 ha
LFI5 2018/26
protective forest region
forest area
altitudinal vegetation belts (NaiS; 6 classes)·stand structure
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
subtotal, %
1000 ha
LFI5 2018/26
protective forest region
forest area
degree of cover (aerial photo, 5 classes)·altitudinal vegetation belts (NaiS; 6 classes)
protective forest (2022): a.f.w.s.f.
1.4 km grid, subgrids 1–5 of 9
column total, %
subtotal, %