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NFI4
number of forest plots
rockfall SilvaProtect · area of largest gap (aerial photo, 5 classes)
unit of reference: protection forest region
unit: %
unit of evaluation: accessible forest
grid: 1.4 x 1.4 km grid
state2009/17
protection forest region
Jura + PlateauNorthwestern AlpsNortheastern AlpsSouthwestern AlpsSoutheastern AlpsSouthern Alps Switzerland
rockfall SilvaProtectarea of largest gap (aerial photo, 5 classes) %± %± %± %± %± %± %±
n/ano gap33.11.012.71.015.31.36.81.08.71.08.50.918.20.5
small gap32.41.014.91.115.81.49.71.214.91.27.10.919.30.5
medium gap9.90.69.50.97.61.07.81.110.61.15.90.88.90.4
large gap9.80.611.00.910.51.112.01.316.01.26.30.810.60.4
very large gap1.20.20.40.20.70.30.20.20.80.30.20.20.70.1
total86.30.748.61.549.81.836.31.851.01.728.01.457.70.5
inside perimeterno gap0.20.11.20.31.20.41.10.40.50.22.10.50.90.1
small gap0.20.10.30.21.60.51.50.50.60.32.00.50.80.1
medium gap0.40.10.40.21.40.41.20.40.80.30.90.30.70.1
large gap0.10.10.30.21.10.41.80.50.70.31.30.40.70.1
very large gap0.0.0.0.0.10.10.10.10.10.10.0.0.00.0
total0.90.22.10.45.40.85.80.92.60.56.30.83.10.2
outside perimeterno gap5.30.511.31.012.81.28.61.17.00.921.51.410.00.4
small gap5.20.517.71.215.81.320.11.611.71.122.31.413.30.4
medium gap1.20.29.60.96.50.911.41.210.01.09.31.06.60.3
large gap1.10.210.00.99.11.116.51.416.31.212.01.18.70.3
very large gap0.10.10.70.30.60.31.30.41.30.40.40.20.60.1
total12.80.749.31.544.71.857.81.946.31.765.71.539.20.5
totalno gap38.61.025.31.329.31.716.41.516.21.232.11.529.10.6
small gap37.81.032.91.433.11.731.31.827.21.531.41.633.40.6
medium gap11.60.719.51.215.51.320.41.621.41.416.11.216.20.5
large gap10.90.721.21.220.61.530.31.833.01.619.71.320.00.5
very large gap1.20.21.10.31.40.41.60.52.30.50.70.31.30.1
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
© WSL, Swiss National Forest Inventory, 10.07.2020 #875934/342266
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