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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 gap38.41.126.21.930.72.418.62.617.11.830.42.931.50.8
small gap37.51.130.72.031.62.426.72.929.22.225.32.833.40.8
medium gap11.50.719.71.815.21.921.32.720.81.921.02.615.40.6
large gap11.30.722.61.821.02.132.93.131.42.222.62.618.40.6
very large gap1.30.30.80.41.40.60.50.51.60.60.80.51.20.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
inside perimeterno gap19.68.856.310.522.26.618.36.317.07.832.96.327.63.2
small gap25.79.913.37.229.57.226.07.122.48.831.76.226.43.1
medium gap44.911.117.27.925.87.021.46.729.99.514.24.723.13.0
large gap9.76.613.37.220.26.431.77.626.29.221.25.421.52.9
very large gap0.0.0.0.2.32.32.52.54.44.30.0.1.40.8
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
outside perimeterno gap41.13.023.01.828.62.514.81.815.11.832.81.925.50.9
small gap40.53.035.82.135.32.634.72.525.32.234.02.034.00.9
medium gap9.71.819.51.714.62.019.72.121.52.014.21.416.90.7
large gap8.31.720.21.720.22.228.62.335.32.418.31.622.10.8
very large gap0.40.41.50.51.20.62.20.82.90.80.70.31.50.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
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 #875957/342289
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