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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 NFI3/NFI4
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 gap38.21.123.21.927.12.414.92.514.31.729.83.030.40.8
small gap37.61.131.32.133.32.627.73.230.22.324.72.934.00.8
medium gap11.50.720.71.815.82.023.03.021.72.121.42.715.70.6
large gap11.30.724.01.922.22.333.93.432.62.323.62.818.70.6
very large gap1.40.30.80.41.60.70.50.51.30.60.40.41.20.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
inside perimeterno gap19.68.856.310.523.56.916.16.019.78.933.56.428.13.3
small gap25.79.913.37.231.17.526.77.320.99.330.56.226.43.2
medium gap44.911.117.27.921.86.822.06.934.610.714.54.822.93.0
large gap9.76.613.37.221.36.732.67.719.98.921.55.521.23.0
very large gap0.0.0.0.2.42.42.62.65.14.90.0.1.50.9
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
outside perimeterno gap41.03.022.71.928.12.514.71.813.51.732.82.025.20.9
small gap40.43.036.32.135.82.635.02.525.62.233.82.034.21.0
medium gap9.81.819.61.714.62.019.92.121.92.114.31.517.00.8
large gap8.41.719.91.720.22.228.42.336.12.418.41.622.20.8
very large gap0.40.41.50.51.30.61.90.72.90.90.70.31.50.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
totalno gap38.41.023.61.327.41.714.91.414.01.232.11.628.20.6
small gap37.91.033.41.534.31.832.01.927.71.631.21.633.90.6
medium gap11.60.720.11.315.61.421.11.722.11.516.21.316.50.5
large gap10.90.721.71.321.31.530.51.933.91.619.91.320.20.5
very large gap1.20.21.20.31.50.51.50.52.20.50.60.31.30.1
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
© WSL, Swiss National Forest Inventory, 10.07.2020 #875956/342288
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