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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 without shrub 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 gap33.11.011.81.013.01.35.50.96.70.96.70.917.60.5
small gap32.41.014.81.114.51.48.91.212.21.25.70.818.90.5
medium gap9.90.69.70.97.31.07.21.09.81.14.70.78.60.4
large gap9.80.610.70.910.71.211.51.316.31.36.30.810.60.4
very large gap1.20.20.40.20.80.30.20.20.80.30.20.20.70.1
total86.30.747.31.546.31.933.21.845.81.823.71.556.40.6
inside perimeterno gap0.20.11.20.41.30.41.10.40.50.32.30.50.90.1
small gap0.20.10.30.21.70.51.40.50.70.32.20.50.90.1
medium gap0.40.10.40.21.50.51.30.50.90.31.00.40.80.1
large gap0.10.10.30.21.20.41.90.60.70.31.40.40.70.1
very large gap0.0.0.0.0.10.10.20.20.10.10.0.0.00.0
total0.90.22.20.55.90.96.01.02.90.67.00.93.20.2
outside perimeterno gap5.30.511.51.013.71.39.11.27.20.922.51.510.20.4
small gap5.20.518.11.216.91.421.01.612.91.223.41.513.70.4
medium gap1.20.29.90.97.11.012.01.311.21.110.01.16.90.3
large gap1.10.210.30.99.51.117.41.518.51.412.81.29.00.4
very large gap0.10.10.80.30.60.31.30.51.50.40.50.20.60.1
total12.80.750.51.547.81.960.91.951.31.869.31.640.40.6
totalno gap38.51.024.51.328.01.715.61.514.41.331.61.628.70.6
small gap37.81.033.11.533.21.831.41.925.81.631.41.633.50.6
medium gap11.60.720.01.215.91.420.51.621.91.515.71.316.30.5
large gap10.90.721.21.221.41.630.91.935.51.720.51.420.30.5
very large gap1.20.21.20.31.50.51.70.52.40.60.70.31.40.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
© WSL, Swiss National Forest Inventory, 10.07.2020 #875932/342264
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