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NFI4
number of forest plots
rockfall SilvaProtect · area of largest gap (aerial photo, 5 classes)
unit of reference: production region
unit: %
unit of evaluation: accessible forest without shrub forest NFI1/NFI2/NFI3/NFI4
grid: 1.4 x 1.4 km grid
state2009/17
production region
JuraPlateauPre-AlpsAlpsSouthern Alps Switzerland
rockfall SilvaProtectarea of largest gap (aerial photo, 5 classes) %± %± %± %± %± %±
n/ano gap32.91.532.31.410.41.05.00.56.11.016.90.5
small gap29.41.535.91.416.91.210.30.84.50.819.70.5
medium gap9.30.910.20.98.90.97.80.72.60.68.20.4
large gap8.00.910.70.910.50.910.90.83.20.79.40.4
very large gap0.80.31.60.40.80.30.30.10.0.0.70.1
total80.41.390.70.947.61.634.21.216.31.554.90.6
inside perimeterno gap0.40.20.0.0.20.11.70.33.00.71.00.1
small gap0.40.20.10.10.20.11.50.32.40.60.90.1
medium gap0.90.30.0.0.30.21.30.31.10.40.70.1
large gap0.20.10.0.0.10.11.40.31.30.50.60.1
very large gap0.0.0.0.0.0.0.10.10.0.0.00.0
total1.90.40.10.10.80.36.00.67.81.13.20.2
outside perimeterno gap7.60.93.50.513.01.19.60.725.41.710.50.4
small gap6.40.84.30.619.61.218.91.026.21.814.60.5
medium gap2.40.50.30.29.00.912.40.810.11.27.10.3
large gap1.30.41.00.39.40.917.50.913.51.39.10.4
very large gap0.0.0.10.10.60.21.40.30.60.30.60.1
total17.61.29.20.951.61.659.81.275.81.741.90.6
totalno gap40.91.635.91.423.61.316.30.934.51.928.40.6
small gap36.31.540.31.536.71.530.71.133.11.935.10.7
medium gap12.61.110.50.918.21.221.51.013.81.416.00.5
large gap9.50.911.70.920.11.229.71.117.91.519.10.5
very large gap0.80.31.70.41.40.41.80.30.60.31.40.2
total100.0.100.0.100.0.100.0.100.0.100.0.
© WSL, Swiss National Forest Inventory, 10.07.2020 #875941/342273
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