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NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · stand stability · economic region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
economic regionstand stability %± %± %±
Western Juracritical..2.40.72.30.7
less stable23.011.730.22.230.02.2
stable77.011.767.42.367.72.2
total100.0.100.0.100.0.
Eastern Juracritical..1.61.21.61.2
less stable..36.14.336.14.3
stable..62.24.462.24.4
total..100.0.100.0.
Western Plateaucritical..2.51.52.51.5
less stable..34.74.434.74.4
stable..62.84.562.84.5
total..100.0.100.0.
Central Plateaucritical..2.71.12.71.1
less stable..38.73.338.73.3
stable..58.63.358.63.3
total..100.0.100.0.
Eastern Plateaucritical..2.20.82.20.8
less stable..38.22.738.22.7
stable..59.62.859.62.8
total..100.0.100.0.
Western Pre-Alpscritical..6.22.35.72.1
less stable44.116.648.24.747.94.5
stable55.916.645.64.746.44.5
total100.0.100.0.100.0.
Central Pre-Alpscritical5.04.98.81.88.51.7
less stable65.010.744.83.146.33.0
stable30.010.346.43.145.23.0
total100.0.100.0.100.0.
Eastern Pre-Alpscritical..4.91.54.71.5
less stable62.517.142.43.543.13.4
stable37.517.152.73.552.13.4
total100.0.100.0.100.0.
Northwestern Alpscritical6.74.65.51.95.71.7
less stable50.09.152.74.152.23.8
stable43.39.141.84.142.13.7
total100.0.100.0.100.0.
Central Alpscritical18.09.47.53.29.63.2
less stable41.012.046.36.145.25.5
stable41.012.046.26.145.15.5
total100.0.100.0.100.0.
Northeastern Alpscritical..11.53.69.43.0
less stable50.011.852.65.752.15.1
stable50.011.835.95.538.65.0
total100.0.100.0.100.0.
Southwestern Alpscritical13.74.013.92.113.81.9
less stable45.25.839.93.041.12.7
stable41.15.846.23.145.12.7
total100.0.100.0.100.0.
Southeastern Alpscritical11.54.46.91.37.51.3
less stable44.36.936.42.537.32.4
stable44.26.956.72.655.22.4
total100.0.100.0.100.0.
Southern Alpscritical5.13.56.91.36.81.2
less stable41.07.949.02.548.32.4
stable53.88.044.02.544.92.4
total100.0.100.0.100.0.
Switzerlandcritical8.51.75.80.46.00.4
less stable45.93.040.60.941.10.8
stable45.63.053.60.953.00.8
total100.0.100.0.100.0.

calculated by unit of reference: economic region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161929/148308

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · stand stability · economic region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
economic regionstand stability1000 ha± %1000 ha± %1000 ha± %
Western Juracritical..3.6313.631
less stable1.15845.4846.48
stable3.631101.14104.74
total4.627150.02154.72
Eastern Juracritical..0.8700.870
less stable..17.41217.412
stable..30.0730.07
total..48.2248.22
Western Plateaucritical..1.2571.257
less stable..16.91316.913
stable..30.6830.68
total..48.7348.73
Central Plateaucritical..1.9401.940
less stable..26.7926.79
stable..40.5640.56
total..69.1269.12
Eastern Plateaucritical..2.5372.537
less stable..43.3743.37
stable..67.6567.65
total..113.32113.32
Western Pre-Alpscritical..2.6372.637
less stable1.55020.31121.810
stable1.94419.21121.110
total3.33342.1445.54
Central Pre-Alpscritical0.41008.2208.620
less stable4.72742.0746.67
stable2.24143.4745.67
total7.22293.63100.82
Eastern Pre-Alpscritical..3.6313.631
less stable1.84430.7932.58
stable1.15738.2739.37
total2.93572.5375.33
Northwestern Alpscritical0.7712.9353.631
less stable5.42527.5932.98
stable4.62721.81126.510
total10.71752.2562.94
Central Alpscritical1.1581.7442.835
less stable2.43710.81613.214
stable2.43710.71613.114
total5.92323.3929.17
Northeastern Alpscritical..3.2323.232
less stable3.23214.71317.911
stable3.23210.01713.314
total6.42227.9734.45
Southwestern Alpscritical3.43112.41615.814
less stable11.31735.7847.07
stable10.31841.3851.67
total25.01189.44114.43
Southeastern Alpscritical2.1419.11911.217
less stable8.12047.5855.67
stable8.12074.0582.15
total18.313130.63148.92
Southern Alpscritical0.7719.71810.418
less stable5.72568.6674.35
stable7.52161.6669.16
total13.815139.93153.82
Switzerlandcritical8.42063.3771.77
less stable45.19447.42492.52
stable44.89590.22634.92
total98.261100.911199.11

calculated by unit of reference: economic region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161930/148309

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · biogeographical region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
biogeographical region
JuraPlateauNorthern AlpsWestern Central-AlpsEastern Central-AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assigneddegree of cover (aerial photo, 5 classes) %± %± %± %± %± %± %±
inside perimeter0-20%....3.51.7......1.40.7
21-40%7.87.5..5.32.17.43.29.14.32.42.46.11.4
41-60%....13.33.233.85.743.27.522.16.523.62.5
61-80%38.413.5..29.24.329.45.527.36.741.47.731.22.8
over 80%53.813.8..48.64.729.45.520.46.134.17.437.72.9
total100.0...100.0.100.0.100.0.100.0.100.0.
outside perimeter0-20%1.70.61.10.41.10.41.70.92.30.92.00.71.50.2
21-40%1.50.51.80.56.30.89.31.913.52.05.51.15.20.4
41-60%8.71.25.10.818.11.331.63.131.42.715.81.815.40.6
61-80%24.71.920.91.532.01.634.63.237.22.826.22.228.00.8
over 80%63.42.171.11.742.51.622.72.815.72.150.62.549.90.9
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
total0-20%1.70.51.10.41.40.41.30.72.00.71.80.61.50.2
21-40%1.70.51.80.56.20.88.81.712.91.85.21.15.30.4
41-60%8.51.25.10.817.61.232.12.732.92.516.41.816.00.6
61-80%25.01.920.91.531.71.533.42.735.92.627.62.128.30.8
over 80%63.22.171.11.743.21.624.32.516.32.049.12.448.90.8
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: biogeographical region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161931/148310

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · biogeographical region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
biogeographical region
JuraPlateauNorthern AlpsWestern Central-AlpsEastern Central-AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assigneddegree of cover (aerial photo, 5 classes)1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeter0-20%....1.450......1.450
21-40%0.4100..2.1411.7451.4500.41006.024
41-60%....5.3267.9206.7223.23323.212
61-80%1.845..11.7176.8224.2286.12430.611
over 80%2.538..19.5136.8223.2335.02637.010
total4.727..40.1923.31115.61414.61598.26
outside perimeter0-20%3.3332.8353.6321.4502.4382.83516.315
21-40%2.9354.62820.2137.22114.5157.82157.28
41-60%16.61413.11657.9724.81133.8922.712168.84
61-80%47.2854.17102.3527.11039.9837.59308.13
over 80%121.44183.93136.0417.81316.91472.55548.52
total191.32258.61319.9278.24107.53143.431098.91
total0-20%3.3332.8355.0271.4502.4382.83517.714
21-40%3.3334.62822.3139.01915.9148.22163.27
41-60%16.61413.11663.2732.6940.5826.011192.04
61-80%49.0854.17114.0533.9944.2843.68338.83
over 80%123.93183.93155.5424.61120.11277.55585.62
total196.01258.61360.01101.53123.02158.021197.21

calculated by unit of reference: biogeographical region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161932/148311

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · canton
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
cantondegree of cover (aerial photo, 5 classes) %± %± %±
AG0-20%..1.61.21.61.2
21-40%..4.11.84.11.8
41-60%..4.92.04.92.0
61-80%..13.93.113.93.1
over 80%..75.43.975.43.9
total..100.0.100.0.
AI0-20%......
21-40%......
41-60%..16.810.813.78.9
61-80%66.727.915.110.224.711.0
over 80%33.328.068.113.361.712.5
total100.0.100.0.100.0.
AR0-20%......
21-40%......
41-60%..4.04.03.83.8
61-80%100.0.27.99.130.69.2
over 80%..68.29.565.69.5
total100.0.100.0.100.0.
BE0-20%7.14.01.80.62.20.7
21-40%12.05.03.50.94.20.9
41-60%14.45.411.01.511.31.4
61-80%28.57.031.52.231.32.1
over 80%38.07.552.22.351.02.2
total100.0.100.0.100.0.
BL/BS0-20%..2.02.02.02.0
21-40%......
41-60%..3.92.83.92.8
61-80%..7.93.87.93.8
over 80%..86.24.986.24.9
total..100.0.100.0.
FR0-20%......
21-40%..4.31.94.21.9
41-60%33.327.315.13.415.63.4
61-80%66.727.328.34.329.34.2
over 80%..52.24.750.94.7
total100.0.100.0.100.0.
GE0-20%......
21-40%......
41-60%..14.814.614.814.6
61-80%..14.814.614.814.6
over 80%..70.518.770.518.7
total..100.0.100.0.
GL0-20%..2.82.82.12.1
21-40%9.28.810.95.210.54.5
41-60%17.511.311.25.312.64.9
61-80%18.311.814.05.815.05.3
over 80%55.015.161.28.259.77.2
total100.0.100.0.100.0.
GR0-20%..2.20.71.90.6
21-40%4.72.610.71.510.01.3
41-60%34.55.932.72.232.92.1
61-80%34.35.934.62.234.52.1
over 80%26.55.519.81.920.61.8
total100.0.100.0.100.0.
JU0-20%..1.21.21.11.1
21-40%......
41-60%..8.23.08.02.9
61-80%50.035.517.44.118.14.1
over 80%50.035.573.34.872.84.8
total100.0.100.0.100.0.
LU0-20%..2.31.32.31.3
21-40%..0.80.80.80.8
41-60%50.035.514.93.215.43.2
61-80%..36.54.335.94.2
over 80%50.035.545.54.445.64.4
total100.0.100.0.100.0.
NE0-20%..1.51.41.41.4
21-40%......
41-60%..9.43.29.13.1
61-80%33.327.436.15.336.15.2
over 80%66.727.353.05.553.45.4
total100.0.100.0.100.0.
NW0-20%......
21-40%......
41-60%..11.88.010.06.9
61-80%33.327.823.510.525.09.9
over 80%66.727.764.711.965.010.9
total100.0.100.0.100.0.
OW0-20%..1.91.91.71.6
21-40%..5.93.35.22.9
41-60%13.412.516.85.516.35.0
61-80%42.718.939.87.140.26.7
over 80%44.018.935.67.036.76.5
total100.0.100.0.100.0.
SG0-20%..0.70.70.60.6
21-40%..5.41.95.01.7
41-60%..16.23.015.22.9
61-80%40.015.523.03.524.13.4
over 80%60.015.554.84.155.14.0
total100.0.100.0.100.0.
SH0-20%......
21-40%......
41-60%..2.82.82.82.8
61-80%..25.07.325.07.3
over 80%..72.27.672.27.6
total..100.0.100.0.
SO0-20%..1.21.21.21.2
21-40%..1.21.21.21.2
41-60%..2.41.72.41.7
61-80%..15.33.915.33.9
over 80%..80.04.480.04.4
total..100.0.100.0.
SZ0-20%......
21-40%..9.53.48.73.1
41-60%..20.24.718.54.3
61-80%14.313.323.04.922.24.6
over 80%85.713.247.35.850.65.6
total100.0.100.0.100.0.
TG0-20%..2.81.92.81.9
21-40%..1.41.41.41.4
41-60%..2.81.92.81.9
61-80%..22.14.922.14.9
over 80%..71.15.471.15.4
total..100.0.100.0.
TI0-20%..1.60.71.50.6
21-40%3.73.66.01.35.81.3
41-60%26.08.510.61.711.81.7
61-80%37.09.325.92.526.82.4
over 80%33.39.155.92.854.12.7
total100.0.100.0.100.0.
UR0-20%10.09.5..1.81.8
21-40%10.09.56.73.87.33.5
41-60%20.012.722.06.221.75.6
61-80%10.09.634.67.030.26.2
over 80%50.015.936.77.139.06.6
total100.0.100.0.100.0.
VD0-20%..1.60.81.50.8
21-40%9.18.74.31.34.51.3
41-60%9.18.712.52.112.42.0
61-80%27.313.428.02.827.92.8
over 80%54.515.053.73.153.73.1
total100.0.100.0.100.0.
VS0-20%..1.50.81.20.6
21-40%6.93.09.71.89.11.6
41-60%31.55.428.52.829.22.5
61-80%28.75.334.93.033.62.6
over 80%32.85.525.32.727.02.4
total100.0.100.0.100.0.
ZG0-20%..6.86.86.86.8
21-40%......
41-60%..13.59.213.59.2
61-80%..18.910.218.910.2
over 80%..60.813.060.813.0
total..100.0.100.0.
ZH0-20%......
21-40%..2.71.32.71.3
41-60%..4.11.64.11.6
61-80%..22.53.522.53.5
over 80%..70.73.870.73.8
total..100.0.100.0.
Switzerland0-20%1.40.71.50.21.50.2
21-40%6.11.45.20.45.30.4
41-60%23.52.515.30.615.90.6
61-80%31.22.827.80.828.10.8
over 80%37.82.950.30.949.30.8
total100.0.100.0.100.0.

calculated by unit of reference: canton

© WSL, Swiss National Forest Inventory, 03.11.2014 #161933/148312

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · canton
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
cantondegree of cover (aerial photo, 5 classes)1000 ha± %1000 ha± %1000 ha± %
AG0-20%..0.8700.870
21-40%..2.0442.044
41-60%..2.4402.440
61-80%..6.8236.823
over 80%..37.0637.06
total..49.1249.12
AI0-20%......
21-40%......
41-60%..0.7710.771
61-80%0.6690.6691.345
over 80%0.31002.9243.222
total1.0544.3185.212
AR0-20%......
21-40%......
41-60%..0.31000.3100
61-80%0.31002.2332.630
over 80%..5.5165.516
total0.31008.178.46
BE0-20%1.0582.8353.830
21-40%1.7455.5257.222
41-60%2.14117.51319.613
61-80%4.12950.1754.27
over 80%5.52582.8588.35
total14.415158.72173.12
BL/BS0-20%..0.41000.4100
21-40%......
41-60%..0.8700.870
61-80%..1.6491.649
over 80%..17.9717.97
total..20.7520.75
FR0-20%......
21-40%..1.8441.844
41-60%0.41006.4236.722
61-80%0.77011.91512.715
over 80%..22.01022.010
total1.15742.2443.33
GE0-20%......
21-40%......
41-60%..0.51000.5100
61-80%..0.51000.5100
over 80%..2.2342.234
total..3.1203.120
GL0-20%..0.41000.4100
21-40%0.41001.5491.944
41-60%0.7711.5492.340
61-80%0.8701.9432.736
over 80%2.3398.41710.714
total4.22813.81118.07
GR0-20%..3.4323.432
21-40%1.05816.81417.814
41-60%7.72151.2758.97
61-80%7.72154.1761.86
over 80%5.92431.01036.99
total22.412156.63179.02
JU0-20%..0.41000.4100
21-40%......
41-60%..2.7372.737
61-80%0.41005.8246.223
over 80%0.410024.5724.97
total0.87033.4334.23
LU0-20%..0.9570.957
21-40%..0.31000.3100
41-60%0.31006.0216.321
61-80%..14.61314.613
over 80%0.310018.31018.610
total0.67040.1340.73
NE0-20%..0.41000.4100
21-40%......
41-60%..2.6342.634
61-80%0.31009.81610.216
over 80%0.67014.41115.110
total1.05727.2528.24
NW0-20%......
21-40%......
41-60%..0.8690.869
61-80%0.41001.5461.940
over 80%0.8694.2225.019
total1.2556.5137.78
OW0-20%..0.31000.3100
21-40%..1.1581.158
41-60%0.31003.0333.331
61-80%1.1577.1198.217
over 80%1.1576.4207.518
total2.53717.8720.45
SG0-20%..0.41000.4100
21-40%..2.9352.935
41-60%..8.7198.719
61-80%1.45012.31613.714
over 80%2.24029.3831.58
total3.63153.5457.14
SH0-20%......
21-40%......
41-60%..0.41000.4100
61-80%..3.2293.229
over 80%..9.3119.311
total..12.8312.83
SO0-20%..0.41000.4100
21-40%..0.41000.4100
41-60%..0.8700.870
61-80%..4.9264.926
over 80%..25.7625.76
total..32.2332.23
SZ0-20%......
21-40%..2.5372.537
41-60%..5.4245.424
61-80%0.41006.2226.522
over 80%2.24012.71314.811
total2.53626.8629.34
TG0-20%..0.6700.670
21-40%..0.31000.3100
41-60%..0.6700.670
61-80%..4.8224.822
over 80%..15.4915.49
total..21.7421.74
TI0-20%..1.8451.845
21-40%0.41006.8237.122
41-60%2.53812.11714.615
61-80%3.63129.61033.19
over 80%3.23363.7666.95
total9.719113.93123.62
UR0-20%0.3100..0.3100
21-40%0.31001.0581.450
41-60%0.7703.4304.127
61-80%0.31005.3235.722
over 80%1.7435.7227.318
total3.33015.41118.78
VD0-20%..1.5501.550
21-40%0.41004.1304.529
41-60%0.410012.11712.417
61-80%1.15826.91028.010
over 80%2.34051.6653.96
total4.23096.13100.32
VS0-20%..1.4501.450
21-40%1.7458.72010.418
41-60%7.92025.51133.49
61-80%7.22131.2938.48
over 80%8.22022.61130.89
total25.01189.44114.43
ZG0-20%..0.41000.4100
21-40%......
41-60%..0.9680.968
61-80%..1.2561.256
over 80%..3.9213.921
total..6.376.37
ZH0-20%......
21-40%..1.4491.449
41-60%..2.1402.140
61-80%..11.61611.616
over 80%..36.7636.76
total..51.8251.82
Switzerland0-20%1.45016.41517.714
21-40%6.02457.1863.17
41-60%23.012168.24191.24
61-80%30.511306.03336.53
over 80%37.010554.02590.92
total97.861101.711199.51

calculated by unit of reference: canton

© WSL, Swiss National Forest Inventory, 03.11.2014 #161934/148313

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · production region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
production region
JuraPlateauPre-AlpsAlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assigneddegree of cover (aerial photo, 5 classes) %± %± %± %± %± %±
inside perimeter0-20%......2.11.0..1.40.7
21-40%7.67.3..5.43.76.91.82.62.56.11.4
41-60%....21.66.825.83.223.26.823.62.5
61-80%38.513.5..29.77.528.93.340.97.931.22.8
over 80%53.913.8..43.38.136.33.533.37.537.72.9
total100.0...100.0.100.0.100.0.100.0.
outside perimeter0-20%1.70.51.20.41.20.51.60.41.80.71.50.2
21-40%1.50.52.00.54.00.810.41.05.61.25.20.4
41-60%7.21.15.90.914.51.527.91.514.61.815.30.6
61-80%23.11.821.71.632.72.033.11.526.72.228.00.8
over 80%66.62.069.11.847.62.127.01.551.32.550.00.9
total100.0.100.0.100.0.100.0.100.0.100.0.
total0-20%1.60.51.20.41.10.41.70.41.60.61.50.2
21-40%1.60.52.00.54.10.89.80.95.31.15.30.4
41-60%7.01.15.90.915.01.427.51.315.41.716.00.6
61-80%23.41.821.71.632.51.932.41.428.02.228.30.8
over 80%66.32.069.11.847.32.028.61.449.72.449.00.8
total100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: production region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161935/148314

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · production region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
production region
JuraPlateauPre-AlpsAlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assigneddegree of cover (aerial photo, 5 classes)1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeter0-20%......1.450..1.450
21-40%0.4100..0.7714.5280.41005.924
41-60%....2.93517.0143.23323.112
61-80%1.845..4.03019.0135.72530.511
over 80%2.638..5.82523.8124.62736.810
total4.727..13.31665.7713.81597.66
outside perimeter0-20%3.3332.8352.5385.3262.53816.415
21-40%2.9354.6278.32133.3107.82156.88
41-60%14.21613.71630.31089.4620.513168.14
61-80%45.6850.3868.16106.2537.39307.53
over 80%131.83159.9399.1586.7671.85549.32
total197.82231.31208.32320.82139.931098.11
total0-20%3.3332.8352.5386.6232.53817.814
21-40%3.3334.6279.02037.898.12162.87
41-60%14.21613.71633.110106.4523.712191.14
61-80%47.4850.3872.16125.2443.08338.03
over 80%134.43159.93104.94110.5576.45586.12
total202.61231.31221.62386.51153.821195.81

calculated by unit of reference: production region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161936/148315

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · protection forest region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
protection forest region
Jura + PlateauNorthwestern AlpsNortheastern AlpsSouthwestern AlpsSoutheastern AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assigneddegree of cover (aerial photo, 5 classes) %± %± %± %± %± %± %±
inside perimeter0-20%..5.12.92.32.3......1.50.7
21-40%7.87.58.53.64.63.26.93.05.83.22.62.56.11.4
41-60%..17.04.99.44.531.55.438.56.823.26.823.62.5
61-80%38.413.528.85.928.06.928.75.330.76.440.97.931.22.8
over 80%53.813.840.76.455.77.632.85.525.06.033.37.537.62.9
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
outside perimeter0-20%1.40.31.30.50.90.51.50.82.10.71.80.71.50.2
21-40%1.80.44.80.96.91.49.71.812.11.75.61.25.20.4
41-60%6.50.716.71.616.92.028.52.833.02.414.61.815.40.6
61-80%22.31.235.92.124.32.334.93.035.62.526.72.228.00.8
over 80%68.01.341.32.251.12.725.32.717.22.051.32.549.90.9
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
total0-20%1.40.31.70.51.00.51.20.61.90.61.60.61.50.2
21-40%1.80.45.20.96.61.39.11.611.31.55.31.15.30.4
41-60%6.40.716.71.616.01.929.22.533.72.315.41.716.00.6
61-80%22.51.235.22.024.72.233.62.635.02.328.02.228.30.8
over 80%67.81.341.22.051.62.527.02.418.11.949.72.448.90.8
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: protection forest region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161937/148316

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · protection forest region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
protection forest region
Jura + PlateauNorthwestern AlpsNortheastern AlpsSouthwestern AlpsSoutheastern AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assigneddegree of cover (aerial photo, 5 classes)1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeter0-20%..1.1580.3100......1.450
21-40%0.41001.8450.7711.7451.1580.41006.024
41-60%..3.6311.4507.9207.0223.23323.112
61-80%1.8456.1244.2297.2215.6255.72530.611
over 80%2.5388.7208.3208.2204.6274.62736.810
total4.72821.31214.91525.01118.31313.81598.06
outside perimeter0-20%6.1242.5381.1581.4502.8352.53816.315
21-40%7.5229.0208.3218.72015.8147.82157.28
41-60%27.91131.41020.51325.51143.1820.513168.94
61-80%95.9567.4629.51031.2946.5737.39307.93
over 80%291.9277.5662.2622.61122.41271.85548.42
total429.31187.92121.6389.44130.63139.931098.71
total0-20%6.1243.6311.4501.4502.8352.53817.714
21-40%7.92110.8189.02010.41816.9148.12163.27
41-60%27.91135.0921.91233.4950.2723.712192.04
61-80%97.7573.6633.7938.4852.1743.08338.53
over 80%294.4286.2570.4530.8927.01176.45585.32
total434.01209.22136.52114.43148.92153.821196.71

calculated by unit of reference: protection forest region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161938/148317

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · economic region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
economic regiondegree of cover (aerial photo, 5 classes) %± %± %±
Western Jura0-20%..1.40.61.40.6
21-40%8.07.61.70.61.90.7
41-60%..8.11.37.91.3
61-80%38.313.525.82.126.12.1
over 80%53.713.863.02.462.72.3
total100.0.100.0.100.0.
Eastern Jura0-20%..2.51.42.51.4
21-40%..0.80.80.80.8
41-60%..4.11.84.11.8
61-80%..14.03.214.03.2
over 80%..78.73.778.73.7
total..100.0.100.0.
Western Plateau0-20%..2.51.52.51.5
21-40%..1.71.21.71.2
41-60%..10.92.910.92.9
61-80%..25.24.025.24.0
over 80%..59.74.559.74.5
total..100.0.100.0.
Central Plateau0-20%..1.30.81.30.8
21-40%..0.90.60.90.6
41-60%..5.81.65.81.6
61-80%..23.52.923.52.9
over 80%..68.43.168.43.1
total..100.0.100.0.
Eastern Plateau0-20%..0.60.40.60.4
21-40%..2.80.92.80.9
41-60%..4.11.14.11.1
61-80%..19.22.219.22.2
over 80%..73.22.573.22.5
total..100.0.100.0.
Western Pre-Alps0-20%..0.90.90.80.8
21-40%22.314.07.02.48.12.5
41-60%33.015.720.23.821.23.7
61-80%22.314.029.84.329.34.1
over 80%22.314.042.14.640.74.4
total100.0.100.0.100.0.
Central Pre-Alps0-20%..1.50.81.40.7
21-40%..3.11.12.91.0
41-60%25.09.713.82.114.62.1
61-80%25.09.740.23.039.12.9
over 80%50.011.241.43.142.02.9
total100.0.100.0.100.0.
Eastern Pre-Alps0-20%..1.00.70.90.7
21-40%..3.41.33.31.2
41-60%..12.32.311.82.2
61-80%50.017.724.63.025.63.0
over 80%50.017.758.63.558.33.4
total100.0.100.0.100.0.
Northwestern Alps0-20%10.05.51.41.02.81.3
21-40%10.05.56.22.06.81.9
41-60%6.74.619.23.317.12.8
61-80%33.38.632.83.932.93.5
over 80%40.09.040.44.140.33.7
total100.0.100.0.100.0.
Central Alps0-20%5.95.7..1.21.2
21-40%5.95.710.83.89.83.3
41-60%11.77.823.95.221.44.5
61-80%18.09.426.75.425.04.7
over 80%58.512.038.56.042.65.4
total100.0.100.0.100.0.
Northeastern Alps0-20%..1.31.31.01.0
21-40%5.65.411.63.610.43.1
41-60%11.27.520.54.618.84.0
61-80%27.810.621.84.722.94.3
over 80%55.511.744.95.746.85.1
total100.0.100.0.100.0.
Southwestern Alps0-20%..1.50.81.20.6
21-40%6.93.09.71.89.11.6
41-60%31.55.428.52.829.22.5
61-80%28.75.334.93.033.62.6
over 80%32.85.525.32.727.02.4
total100.0.100.0.100.0.
Southeastern Alps0-20%..2.10.71.90.6
21-40%5.83.212.11.711.31.5
41-60%38.56.833.02.433.72.3
61-80%30.76.435.62.535.02.3
over 80%25.06.017.22.018.11.9
total100.0.100.0.100.0.
Southern Alps0-20%..1.80.71.60.6
21-40%2.62.55.61.25.31.1
41-60%23.26.814.61.815.41.7
61-80%40.97.926.72.228.02.2
over 80%33.37.551.32.549.72.4
total100.0.100.0.100.0.
Switzerland0-20%1.40.71.50.21.50.2
21-40%6.11.45.20.45.30.4
41-60%23.62.515.30.616.00.6
61-80%31.22.828.00.828.30.8
over 80%37.62.950.00.949.00.8
total100.0.100.0.100.0.

calculated by unit of reference: economic region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161939/148318

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · degree of cover (aerial photo, 5 classes) · economic region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
economic regiondegree of cover (aerial photo, 5 classes)1000 ha± %1000 ha± %1000 ha± %
Western Jura0-20%..2.2412.241
21-40%0.41002.5382.935
41-60%..12.21712.217
61-80%1.84538.6940.48
over 80%2.53894.5497.04
total4.627150.02154.72
Eastern Jura0-20%..1.2571.257
21-40%..0.41000.4100
41-60%..2.0442.044
61-80%..6.7236.723
over 80%..37.9537.95
total..48.2248.22
Western Plateau0-20%..1.2571.257
21-40%..0.8700.870
41-60%..5.3275.327
61-80%..12.31612.316
over 80%..29.1829.18
total..48.7348.73
Central Plateau0-20%..0.9570.957
21-40%..0.6710.671
41-60%..4.0274.027
61-80%..16.21216.212
over 80%..47.2547.25
total..69.1269.12
Eastern Plateau0-20%..0.7710.771
21-40%..3.2333.233
41-60%..4.7274.727
61-80%..21.81221.812
over 80%..82.9482.94
total..113.32113.32
Western Pre-Alps0-20%..0.41000.4100
21-40%0.7702.9353.731
41-60%1.1588.5199.618
61-80%0.77012.61513.314
over 80%0.77017.71218.511
total3.33342.1445.54
Central Pre-Alps0-20%..1.4501.450
21-40%..2.9352.935
41-60%1.84512.91614.715
61-80%1.84437.7839.48
over 80%3.63138.7842.37
total7.22293.63100.82
Eastern Pre-Alps0-20%..0.7710.771
21-40%..2.5372.537
41-60%..8.9198.919
61-80%1.45017.91319.312
over 80%1.45042.5643.96
total2.93572.5375.33
Northwestern Alps0-20%1.1570.7711.844
21-40%1.1573.2334.328
41-60%0.77110.01810.717
61-80%3.63117.21320.711
over 80%4.32821.11125.410
total10.71752.2562.94
Central Alps0-20%0.3100..0.3100
21-40%0.31002.5382.935
41-60%0.7705.6246.222
61-80%1.1586.2227.320
over 80%3.4309.01712.414
total5.92323.3929.17
Northeastern Alps0-20%..0.41000.4100
21-40%0.41003.2333.631
41-60%0.7715.7236.522
61-80%1.8446.1237.919
over 80%3.63012.51416.112
total6.42227.9734.45
Southwestern Alps0-20%..1.4501.450
21-40%1.7458.72010.418
41-60%7.92025.51133.49
61-80%7.22131.2938.48
over 80%8.22022.61130.89
total25.01189.44114.43
Southeastern Alps0-20%..2.8352.835
21-40%1.15815.81416.914
41-60%7.02243.1850.27
61-80%5.62546.5752.17
over 80%4.62722.41227.011
total18.313130.63148.92
Southern Alps0-20%..2.5382.538
21-40%0.41007.8218.121
41-60%3.23320.51323.712
61-80%5.72537.3943.08
over 80%4.62771.8576.45
total13.815139.93153.82
Switzerland0-20%1.45016.51517.914
21-40%6.02457.1863.27
41-60%23.212168.94192.04
61-80%30.711308.33338.93
over 80%37.010550.12587.12
total98.261100.911199.11

calculated by unit of reference: economic region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161940/148319

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · biogeographical region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
biogeographical region
JuraPlateauNorthern AlpsWestern Central-AlpsEastern Central-AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedconcept of transportation system %± %± %± %± %± %± %±
inside perimeterroad and skidding track23.011.7..6.22.37.33.225.06.52.42.49.71.8
road and skidding road30.712.8..4.41.9....2.42.43.61.1
road and cable line30.712.8..60.24.652.96.136.37.339.07.650.13.0
road and flight path7.87.5..19.53.733.95.838.77.451.27.830.12.7
no access intended7.77.4..9.72.85.92.9..4.93.46.51.5
total100.0...100.0.100.0.100.0.100.0.100.0.
outside perimeterroad and skidding track51.62.269.11.719.91.320.62.721.72.44.01.035.10.8
road and skidding road37.72.119.01.511.41.17.41.76.61.48.71.416.70.6
road and cable line5.11.03.80.740.61.625.92.946.62.925.82.223.40.7
road and flight path0.40.30.10.19.11.043.03.324.82.544.92.514.10.6
no access intended5.31.07.91.019.01.33.11.20.30.316.71.810.70.5
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
totalroad and skidding track50.92.169.11.718.41.217.52.222.12.23.80.933.10.7
road and skidding road37.52.119.01.510.71.05.71.45.81.38.11.315.60.6
road and cable line5.71.03.80.742.81.632.12.745.32.727.02.125.60.7
road and flight path0.60.30.10.110.21.040.92.926.52.445.52.415.40.6
no access intended5.31.07.91.018.01.23.71.10.30.315.61.710.40.5
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: biogeographical region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161941/148320

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · biogeographical region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
biogeographical region
JuraPlateauNorthern AlpsWestern Central-AlpsEastern Central-AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedconcept of transportation system1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeterroad and skidding track1.158..2.5381.7443.9300.41009.519
road and skidding road1.450..1.845....0.41003.632
road and cable line1.450..24.11212.3165.7245.72549.28
road and flight path0.4100..7.8217.9206.0247.52129.611
no access intended0.4100..3.9301.450..0.7716.323
total4.727..40.1923.31115.61414.61598.26
outside perimeterroad and skidding track98.85178.6363.7716.11423.3115.725386.22
road and skidding road72.1649.2836.695.8247.12212.416183.24
road and cable line9.7199.919129.9420.31250.1737.09256.93
road and flight path0.7710.410029.01133.6926.61164.46154.74
no access intended10.11820.51360.772.4380.410023.912118.05
total191.32258.61319.9278.24107.53143.431098.91
totalroad and skidding track99.84178.6366.2717.81327.2106.124395.72
road and skidding road73.5649.2838.495.8247.12212.816186.74
road and cable line11.2179.919154.0432.6955.8642.78306.13
road and flight path1.1580.410036.8941.5832.6971.96184.34
no access intended10.41820.51364.673.8300.410024.611124.35
total196.01258.61360.01101.53123.02158.021197.21

calculated by unit of reference: biogeographical region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161942/148321

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · canton
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
cantonconcept of transportation system %± %± %±
AGroad and skidding track..61.54.461.54.4
road and skidding road..32.04.232.04.2
road and cable line......
road and flight path......
no access intended..6.62.26.62.2
total..100.0.100.0.
AIroad and skidding track..68.113.155.512.6
road and skidding road33.328.016.810.819.810.3
road and cable line33.328.015.110.118.59.9
road and flight path33.328.0..6.26.1
no access intended......
total100.0.100.0.100.0.
ARroad and skidding track..63.79.761.29.6
road and skidding road..15.97.415.37.2
road and cable line100.0.20.48.223.48.5
road and flight path......
no access intended......
total100.0.100.0.100.0.
BEroad and skidding track7.34.139.52.336.82.1
road and skidding road7.14.022.01.920.81.8
road and cable line68.87.226.82.130.32.0
road and flight path12.05.01.10.52.00.6
no access intended4.73.310.61.410.11.3
total100.0.100.0.100.0.
BL/BSroad and skidding track..57.16.957.16.9
road and skidding road..35.16.735.16.7
road and cable line..5.93.35.93.3
road and flight path......
no access intended..2.02.02.02.0
total..100.0.100.0.
FRroad and skidding track..43.54.742.34.6
road and skidding road..14.13.313.73.2
road and cable line66.727.325.74.126.74.1
road and flight path......
no access intended33.327.316.83.517.23.5
total100.0.100.0.100.0.
GEroad and skidding track..100.0.100.0.
road and skidding road......
road and cable line......
road and flight path......
no access intended......
total..100.0.100.0.
GLroad and skidding track......
road and skidding road......
road and cable line45.815.169.57.764.07.1
road and flight path27.513.65.63.910.74.6
no access intended26.713.324.97.325.36.4
total100.0.100.0.100.0.
GRroad and skidding track21.85.221.21.921.31.8
road and skidding road..5.41.14.70.9
road and cable line43.86.246.12.445.82.2
road and flight path32.85.924.62.025.71.9
no access intended1.61.52.70.82.50.7
total100.0.100.0.100.0.
JUroad and skidding track..45.35.444.35.3
road and skidding road50.035.548.85.448.95.4
road and cable line..1.21.21.11.1
road and flight path......
no access intended50.035.54.72.35.72.5
total100.0.100.0.100.0.
LUroad and skidding track..24.33.823.93.7
road and skidding road..10.22.710.02.6
road and cable line50.035.510.32.710.92.8
road and flight path......
no access intended50.035.555.24.455.24.4
total100.0.100.0.100.0.
NEroad and skidding track33.327.452.45.551.75.4
road and skidding road66.727.341.85.442.65.3
road and cable line......
road and flight path......
no access intended..5.92.65.72.5
total100.0.100.0.100.0.
NWroad and skidding track..5.95.85.05.0
road and skidding road..11.88.010.06.9
road and cable line33.327.835.311.835.010.9
road and flight path33.327.811.88.015.08.2
no access intended33.327.835.311.835.010.9
total100.0.100.0.100.0.
OWroad and skidding track..2.12.11.81.8
road and skidding road..10.54.59.23.9
road and cable line56.018.950.17.350.86.8
road and flight path44.018.914.75.218.35.3
no access intended..22.76.119.85.4
total100.0.100.0.100.0.
SGroad and skidding track30.014.537.84.037.33.9
road and skidding road20.012.718.23.218.43.1
road and cable line20.012.726.43.625.93.5
road and flight path20.012.716.93.117.13.0
no access intended10.09.50.70.71.30.9
total100.0.100.0.100.0.
SHroad and skidding track..83.36.083.36.0
road and skidding road..13.95.813.95.8
road and cable line..2.82.82.82.8
road and flight path......
no access intended......
total..100.0.100.0.
SOroad and skidding track..55.35.455.35.4
road and skidding road..31.85.131.85.1
road and cable line..9.43.29.43.2
road and flight path......
no access intended..3.52.03.52.0
total..100.0.100.0.
SZroad and skidding track..4.02.33.72.1
road and skidding road..14.94.213.63.8
road and cable line71.417.133.85.537.05.4
road and flight path..4.02.33.72.1
no access intended28.617.243.35.842.05.5
total100.0.100.0.100.0.
TGroad and skidding track..83.14.583.14.5
road and skidding road..15.54.315.54.3
road and cable line..1.41.41.41.4
road and flight path......
no access intended......
total..100.0.100.0.
TIroad and skidding track..2.80.92.60.9
road and skidding road3.73.610.01.79.51.6
road and cable line25.98.420.42.320.82.2
road and flight path66.79.149.12.850.52.7
no access intended3.73.617.72.116.62.0
total100.0.100.0.100.0.
URroad and skidding track..15.65.412.84.5
road and skidding road..9.24.47.53.6
road and cable line60.015.634.67.039.06.6
road and flight path40.015.621.46.024.75.8
no access intended..19.35.815.94.9
total100.0.100.0.100.0.
VDroad and skidding track..48.73.146.73.1
road and skidding road..20.52.519.72.4
road and cable line81.811.613.82.216.62.3
road and flight path18.211.65.91.56.41.5
no access intended..11.12.010.61.9
total100.0.100.0.100.0.
VSroad and skidding track8.23.220.72.518.02.1
road and skidding road..8.81.86.91.4
road and cable line53.45.828.12.833.62.6
road and flight path32.95.539.63.038.22.7
no access intended5.52.72.71.03.31.0
total100.0.100.0.100.0.
ZGroad and skidding track..52.713.352.713.3
road and skidding road..13.59.213.59.2
road and cable line..33.812.633.812.6
road and flight path......
no access intended......
total..100.0.100.0.
ZHroad and skidding track..74.83.674.83.6
road and skidding road..12.32.712.32.7
road and cable line..12.22.712.22.7
road and flight path......
no access intended..0.70.70.70.7
total..100.0.100.0.
Switzerlandroad and skidding track9.61.835.20.833.20.7
road and skidding road3.51.116.80.715.70.6
road and cable line50.03.023.30.725.50.7
road and flight path30.22.814.10.615.40.6
no access intended6.61.510.60.510.20.5
total100.0.100.0.100.0.

calculated by unit of reference: canton

© WSL, Swiss National Forest Inventory, 03.11.2014 #161943/148322

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · canton
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
cantonconcept of transportation system1000 ha± %1000 ha± %1000 ha± %
AGroad and skidding track..30.2730.27
road and skidding road..15.71315.713
road and cable line......
road and flight path......
no access intended..3.2343.234
total..49.1249.12
AIroad and skidding track..2.9242.924
road and skidding road0.31000.7711.057
road and cable line0.31000.6691.054
road and flight path0.3100..0.3100
no access intended......
total1.0544.3185.212
ARroad and skidding track..5.1165.116
road and skidding road..1.3471.347
road and cable line0.31001.6432.038
road and flight path......
no access intended......
total0.31008.178.46
BEroad and skidding track1.05862.7663.86
road and skidding road1.05834.9935.99
road and cable line9.91842.5852.47
road and flight path1.7451.7453.431
no access intended0.77116.81417.513
total14.415158.72173.12
BL/BSroad and skidding track..11.81311.813
road and skidding road..7.3207.320
road and cable line..1.2571.257
road and flight path......
no access intended..0.41000.4100
total..20.7520.75
FRroad and skidding track..18.31118.311
road and skidding road..5.9245.924
road and cable line0.77010.81611.616
road and flight path......
no access intended0.41007.1217.521
total1.15742.2443.33
GEroad and skidding track..3.1203.120
road and skidding road......
road and cable line......
road and flight path......
no access intended......
total..3.1203.120
GLroad and skidding track......
road and skidding road......
road and cable line1.9439.61511.513
road and flight path1.2570.8701.943
no access intended1.1573.4314.627
total4.22813.81118.07
GRroad and skidding track4.92633.3938.19
road and skidding road..8.4208.420
road and cable line9.81872.2682.05
road and flight path7.32138.6945.98
no access intended0.31004.2294.528
total22.412156.63179.02
JUroad and skidding track..15.21215.212
road and skidding road0.410016.31216.711
road and cable line..0.41000.4100
road and flight path......
no access intended0.41001.6491.944
total0.87033.4334.23
LUroad and skidding track..9.7169.716
road and skidding road..4.1264.126
road and cable line0.31004.1274.526
road and flight path......
no access intended0.310022.2922.59
total0.67040.1340.73
NEroad and skidding track0.310014.21214.611
road and skidding road0.67011.41412.013
road and cable line......
road and flight path......
no access intended..1.6441.644
total1.05727.2528.24
NWroad and skidding track..0.41000.4100
road and skidding road..0.8690.869
road and cable line0.41002.3362.732
road and flight path0.41000.8691.255
no access intended0.41002.3362.732
total1.2556.5137.78
OWroad and skidding track..0.41000.4100
road and skidding road..1.9431.943
road and cable line1.4508.91610.414
road and flight path1.1572.6363.729
no access intended..4.0284.028
total2.53717.8720.45
SGroad and skidding track1.15720.21121.311
road and skidding road0.7709.81810.517
road and cable line0.77014.11414.814
road and flight path0.7709.0199.818
no access intended0.41000.41000.770
total3.63153.5457.14
SHroad and skidding track..10.7810.78
road and skidding road..1.8421.842
road and cable line..0.41000.4100
road and flight path......
no access intended......
total..12.8312.83
SOroad and skidding track..17.81017.810
road and skidding road..10.21710.217
road and cable line..3.0343.034
road and flight path......
no access intended..1.1571.157
total..32.2332.23
SZroad and skidding track..1.1571.157
road and skidding road..4.0294.029
road and cable line1.8449.11710.915
road and flight path..1.1571.157
no access intended0.77011.61512.314
total2.53626.8629.34
TGroad and skidding track..18.0618.06
road and skidding road..3.4293.429
road and cable line..0.31000.3100
road and flight path......
no access intended......
total..21.7421.74
TIroad and skidding track..3.2333.233
road and skidding road0.410011.41711.817
road and cable line2.53723.21125.711
road and flight path6.52355.9662.46
no access intended0.410020.11320.512
total9.719113.93123.62
URroad and skidding track..2.4372.437
road and skidding road..1.4501.450
road and cable line2.0395.3237.318
road and flight path1.3493.3304.624
no access intended..3.0313.031
total3.33015.41118.78
VDroad and skidding track..46.8746.87
road and skidding road..19.71319.713
road and cable line3.43313.31616.714
road and flight path0.8715.6256.424
no access intended..10.61810.618
total4.23096.13100.32
VSroad and skidding track2.14118.51320.612
road and skidding road..7.9207.920
road and cable line13.41525.11138.58
road and flight path8.22035.4943.77
no access intended1.4502.4383.830
total25.01189.44114.43
ZGroad and skidding track..3.3273.327
road and skidding road..0.9680.968
road and cable line..2.1372.137
road and flight path......
no access intended......
total..6.376.37
ZHroad and skidding track..38.8538.85
road and skidding road..6.4226.422
road and cable line..6.3226.322
road and flight path......
no access intended..0.41000.4100
total..51.8251.82
Switzerlandroad and skidding track9.419388.32397.72
road and skidding road3.532185.44188.94
road and cable line48.98256.73305.63
road and flight path29.611154.84184.44
no access intended6.424116.45122.95
total97.861101.711199.51

calculated by unit of reference: canton

© WSL, Swiss National Forest Inventory, 03.11.2014 #161944/148323

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · production region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
production region
JuraPlateauPre-AlpsAlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedconcept of transportation system %± %± %± %± %± %±
inside perimeterroad and skidding track23.111.7..8.14.510.52.22.62.59.71.8
road and skidding road30.812.8..8.14.51.10.72.62.53.71.1
road and cable line30.812.8..54.18.253.73.635.97.750.13.0
road and flight path7.67.3..18.96.429.03.353.88.030.12.7
no access intended7.77.4..10.85.15.81.75.13.56.51.5
total100.0...100.0.100.0.100.0.100.0.
outside perimeterroad and skidding track52.02.171.11.825.61.819.21.33.00.935.20.8
road and skidding road36.92.118.11.516.61.57.00.88.61.416.80.7
road and cable line4.40.93.60.731.51.942.41.626.02.223.20.7
road and flight path0.40.30.20.25.71.024.41.445.32.514.10.6
no access intended6.31.07.01.020.61.77.10.817.01.910.70.5
total100.0.100.0.100.0.100.0.100.0.100.0.
totalroad and skidding track51.32.171.11.824.61.717.71.13.00.833.10.7
road and skidding road36.82.018.11.516.11.56.00.78.01.315.70.6
road and cable line5.00.93.60.732.81.944.31.526.92.125.40.7
road and flight path0.50.30.20.26.51.025.11.346.12.415.40.6
no access intended6.31.07.01.020.01.66.90.815.91.710.40.5
total100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: production region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161945/148324

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · production region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
production region
JuraPlateauPre-AlpsAlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedconcept of transportation system1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeterroad and skidding track1.158..1.1586.9220.41009.419
road and skidding road1.550..1.1580.7710.41003.632
road and cable line1.550..7.22235.395.02648.98
road and flight path0.4100..2.53819.0137.52129.411
no access intended0.4100..1.4503.8300.7716.324
total4.727..13.31665.7713.81597.66
outside perimeterroad and skidding track102.94164.5353.3761.574.329386.52
road and skidding road73.0641.8834.61022.61212.017184.04
road and cable line8.8208.42065.66135.9436.49255.13
road and flight path0.7710.410011.91778.1663.46154.64
no access intended12.41716.21442.9822.71223.811117.95
total197.82231.31208.32320.82139.931098.11
totalroad and skidding track104.04164.5354.4768.474.627396.02
road and skidding road74.5641.8835.7923.31212.416187.64
road and cable line10.2188.42072.86171.1441.48304.03
road and flight path1.1580.410014.41597.2570.96183.94
no access intended12.81616.21444.3826.51124.511124.35
total202.61231.31221.62386.51153.821195.81

calculated by unit of reference: production region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161946/148325

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · protection forest region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
protection forest region
Jura + PlateauNorthwestern AlpsNortheastern AlpsSouthwestern AlpsSoutheastern AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedconcept of transportation system %± %± %± %± %± %± %±
inside perimeterroad and skidding track23.111.71.71.77.03.98.23.225.06.02.62.59.61.8
road and skidding road30.712.83.42.47.03.9....2.62.53.61.1
road and cable line30.712.869.56.048.87.653.45.840.46.835.97.750.23.0
road and flight path7.87.516.94.923.26.432.95.534.76.653.88.030.12.7
no access intended7.77.48.53.614.05.35.52.7..5.13.56.51.5
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
outside perimeterroad and skidding track62.51.417.31.725.62.320.72.524.82.23.00.935.20.8
road and skidding road26.61.313.81.512.61.88.81.85.91.28.61.416.70.7
road and cable line4.00.639.92.135.42.628.12.845.42.626.02.223.30.7
road and flight path0.20.15.21.011.41.739.63.023.52.245.32.514.00.6
no access intended6.70.723.81.915.11.92.71.00.30.317.01.910.80.5
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
totalroad and skidding track62.11.415.71.523.52.218.02.124.82.13.00.833.10.7
road and skidding road26.61.312.81.412.01.66.91.45.21.18.01.315.60.6
road and cable line4.30.642.92.136.82.433.62.644.82.426.92.125.50.7
road and flight path0.30.26.41.012.71.738.22.724.92.146.12.415.40.6
no access intended6.70.722.21.714.91.83.31.00.20.215.91.710.40.5
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: protection forest region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161947/148326

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · protection forest region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
protection forest region
Jura + PlateauNorthwestern AlpsNortheastern AlpsSouthwestern AlpsSoutheastern AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedconcept of transportation system1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeterroad and skidding track1.1580.41001.0582.1414.6270.41009.419
road and skidding road1.4500.7711.058....0.41003.532
road and cable line1.45014.8157.32113.4157.4215.02649.28
road and flight path0.41003.6313.4318.2206.3237.52129.511
no access intended0.41001.8452.1411.450..0.7716.324
total4.72821.31214.91525.01118.31313.81598.06
outside perimeterroad and skidding track268.3232.51031.11018.51332.494.329387.12
road and skidding road114.1526.01115.3147.9207.82112.017183.04
road and cable line17.21475.0643.0825.11159.3636.49256.13
road and flight path1.1589.71913.91535.4930.81063.46154.34
no access intended28.61144.7818.3132.4380.410023.811118.25
total429.31187.92121.6389.44130.63139.931098.71
totalroad and skidding track269.4232.81032.1920.61237.094.627396.52
road and skidding road115.6526.71116.3147.9207.82112.416186.64
road and cable line18.61489.8550.3738.5866.7641.48305.33
road and flight path1.45013.31617.31443.7737.1970.96183.84
no access intended29.01146.5820.4123.8300.410024.511124.55
total434.01209.22136.52114.43148.92153.821196.71

calculated by unit of reference: protection forest region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161948/148327

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · economic region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
economic regionconcept of transportation system %± %± %±
Western Juraroad and skidding track23.011.749.62.448.82.4
road and skidding road30.712.837.92.437.62.3
road and cable line30.712.84.81.05.51.1
road and flight path8.07.60.50.30.70.4
no access intended7.77.47.41.37.41.3
total100.0.100.0.100.0.
Eastern Juraroad and skidding track..60.74.460.74.4
road and skidding road..33.54.333.54.3
road and cable line..3.31.63.31.6
road and flight path......
no access intended..2.51.42.51.4
total..100.0.100.0.
Western Plateauroad and skidding track..72.94.172.94.1
road and skidding road..17.83.517.83.5
road and cable line..0.80.80.80.8
road and flight path......
no access intended..8.52.68.52.6
total..100.0.100.0.
Central Plateauroad and skidding track..64.03.264.03.2
road and skidding road..19.32.619.32.6
road and cable line..3.61.23.61.2
road and flight path......
no access intended..13.12.313.12.3
total..100.0.100.0.
Eastern Plateauroad and skidding track..75.42.475.42.4
road and skidding road..17.42.117.42.1
road and cable line..4.71.24.71.2
road and flight path..0.30.30.30.3
no access intended..2.20.82.20.8
total..100.0.100.0.
Western Pre-Alpsroad and skidding track10.610.129.94.328.54.1
road and skidding road11.210.68.72.68.92.6
road and cable line67.015.740.34.642.34.5
road and flight path..5.32.14.92.0
no access intended11.210.615.83.415.53.3
total100.0.100.0.100.0.
Central Pre-Alpsroad and skidding track..14.62.213.52.0
road and skidding road..19.92.518.52.3
road and cable line55.011.131.42.933.12.8
road and flight path30.010.33.41.15.31.3
no access intended15.08.030.72.929.52.7
total100.0.100.0.100.0.
Eastern Pre-Alpsroad and skidding track25.015.337.43.437.03.3
road and skidding road25.015.316.72.617.12.6
road and cable line37.517.126.63.127.03.1
road and flight path12.511.78.92.09.02.0
no access intended..10.32.110.02.1
total100.0.100.0.100.0.
Northwestern Alpsroad and skidding track..12.42.710.32.3
road and skidding road3.33.36.92.16.31.8
road and cable line80.07.354.74.159.03.7
road and flight path13.36.28.22.39.12.2
no access intended3.33.317.83.215.32.7
total100.0.100.0.100.0.
Central Alpsroad and skidding track..10.63.88.53.1
road and skidding road..7.63.36.12.6
road and cable line64.911.634.15.840.35.4
road and flight path23.410.316.34.517.74.2
no access intended11.77.831.45.727.44.9
total100.0.100.0.100.0.
Northeastern Alpsroad and skidding track5.65.47.73.07.32.7
road and skidding road5.65.46.42.86.22.5
road and cable line38.911.560.35.656.25.1
road and flight path27.810.612.83.815.63.7
no access intended22.39.812.83.814.63.6
total100.0.100.0.100.0.
Southwestern Alpsroad and skidding track8.23.220.72.518.02.1
road and skidding road..8.81.86.91.4
road and cable line53.45.828.12.833.62.6
road and flight path32.95.539.63.038.22.7
no access intended5.52.72.71.03.31.0
total100.0.100.0.100.0.
Southeastern Alpsroad and skidding track25.06.024.82.224.82.1
road and skidding road..5.91.25.21.1
road and cable line40.46.845.42.644.82.4
road and flight path34.76.623.52.224.92.1
no access intended..0.30.30.20.2
total100.0.100.0.100.0.
Southern Alpsroad and skidding track2.62.53.00.93.00.8
road and skidding road2.62.58.61.48.01.3
road and cable line35.97.726.02.226.92.1
road and flight path53.88.045.32.546.12.4
no access intended5.13.517.01.915.91.7
total100.0.100.0.100.0.
Switzerlandroad and skidding track9.61.835.30.833.20.7
road and skidding road3.61.116.70.715.60.6
road and cable line50.23.023.30.725.50.7
road and flight path30.12.714.00.615.30.6
no access intended6.51.510.70.510.30.5
total100.0.100.0.100.0.

calculated by unit of reference: economic region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161949/148328

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · concept of transportation system · economic region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
avalanches SilvaProtect, modelled and assigned
inside perimeteroutside perimetertotal
economic regionconcept of transportation system1000 ha± %1000 ha± %1000 ha± %
Western Juraroad and skidding track1.15874.3575.45
road and skidding road1.45056.8758.26
road and cable line1.4507.1228.620
road and flight path0.41000.7711.158
no access intended0.410011.11711.417
total4.627150.02154.72
Eastern Juraroad and skidding track..29.3729.37
road and skidding road..16.21316.213
road and cable line..1.6491.649
road and flight path......
no access intended..1.2571.257
total..48.2248.22
Western Plateauroad and skidding track..35.6735.67
road and skidding road..8.7208.720
road and cable line..0.41000.4100
road and flight path......
no access intended..4.1304.130
total..48.7348.73
Central Plateauroad and skidding track..44.2644.26
road and skidding road..13.31413.314
road and cable line..2.5352.535
road and flight path......
no access intended..9.1189.118
total..69.1269.12
Eastern Plateauroad and skidding track..85.4485.44
road and skidding road..19.71219.712
road and cable line..5.4255.425
road and flight path..0.41000.4100
no access intended..2.5372.537
total..113.32113.32
Western Pre-Alpsroad and skidding track0.410012.61513.015
road and skidding road0.41003.7314.029
road and cable line2.24017.01219.211
road and flight path..2.2402.240
no access intended0.41006.7227.021
total3.33342.1445.54
Central Pre-Alpsroad and skidding track..13.61513.615
road and skidding road..18.61318.613
road and cable line3.93029.41033.49
road and flight path2.2403.2335.425
no access intended1.15828.71029.810
total7.22293.63100.82
Eastern Pre-Alpsroad and skidding track0.77127.11027.99
road and skidding road0.77112.11612.916
road and cable line1.15719.31220.412
road and flight path0.41006.4236.822
no access intended..7.5217.521
total2.93572.5375.33
Northwestern Alpsroad and skidding track..6.5236.523
road and skidding road0.41003.6313.930
road and cable line8.61928.6937.27
road and flight path1.4504.3285.724
no access intended0.41009.3199.718
total10.71752.2562.94
Central Alpsroad and skidding track..2.5372.537
road and skidding road..1.8441.844
road and cable line3.8297.91911.715
road and flight path1.4493.8295.224
no access intended0.7707.3208.019
total5.92323.3929.17
Northeastern Alpsroad and skidding track0.41002.2402.537
road and skidding road0.41001.8442.140
road and cable line2.53716.81219.310
road and flight path1.8443.6305.424
no access intended1.4503.6315.026
total6.42227.9734.45
Southwestern Alpsroad and skidding track2.14118.51320.612
road and skidding road..7.9207.920
road and cable line13.41525.11138.58
road and flight path8.22035.4943.77
no access intended1.4502.4383.830
total25.01189.44114.43
Southeastern Alpsroad and skidding track4.62732.4937.09
road and skidding road..7.8217.821
road and cable line7.42159.3666.76
road and flight path6.32330.81037.19
no access intended..0.41000.4100
total18.313130.63148.92
Southern Alpsroad and skidding track0.41004.3294.627
road and skidding road0.410012.01712.416
road and cable line5.02636.4941.48
road and flight path7.52163.4670.96
no access intended0.77123.81124.511
total13.815139.93153.82
Switzerlandroad and skidding track9.519388.52397.92
road and skidding road3.632183.94187.44
road and cable line49.38256.93306.23
road and flight path29.511154.24183.74
no access intended6.423117.55123.95
total98.261100.911199.11

calculated by unit of reference: economic region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161950/148329

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · main type of harvest · biogeographical region
unit: %
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
biogeographical region
JuraPlateauNorthern AlpsWestern Central-AlpsEastern Central-AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedmain type of harvest %± %± %± %± %± %± %±
inside perimeterskidder46.113.8..18.63.716.24.522.76.34.93.417.92.3
forwarder7.77.4..0.90.91.51.5....1.10.6
mobile tower yarder30.712.8..23.04.030.95.618.25.814.65.523.22.5
cable crane....30.14.313.24.122.76.324.46.722.72.5
helicopter7.87.5..27.44.238.35.936.47.353.77.834.42.8
others7.77.4........2.42.40.70.5
total100.0...100.0.100.0.100.0.100.0.100.0.
outside perimeterskidder61.42.159.01.837.21.625.42.919.12.310.91.640.50.8
forwarder30.32.035.81.84.00.73.91.37.91.52.50.816.30.6
mobile tower yarder4.90.93.70.721.01.417.52.521.72.410.61.512.60.6
cable crane1.10.50.50.319.71.35.31.524.92.513.71.710.70.5
helicopter0.60.30.30.217.61.347.03.326.02.558.42.518.80.6
others1.70.60.70.30.40.20.90.60.30.33.91.01.20.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.
totalskidder61.02.159.01.835.21.523.32.519.62.110.31.438.60.8
forwarder29.82.035.81.83.70.63.41.06.91.42.30.715.00.6
mobile tower yarder5.51.03.70.721.21.320.62.421.32.211.01.513.50.6
cable crane1.10.40.50.320.81.37.11.524.72.314.71.711.60.5
helicopter0.70.40.30.218.71.245.02.927.32.458.02.320.10.6
others1.80.60.70.30.40.20.70.50.30.33.80.91.20.2
total100.0.100.0.100.0.100.0.100.0.100.0.100.0.

calculated by unit of reference: biogeographical region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161951/148330

NFI4b

forest area: avalanches SilvaProtect, modelled and assigned · main type of harvest · biogeographical region
unit: 1000 ha
unit of evaluation: accessible forest excluding shrub forest
grid:
state 2009/13
biogeographical region
JuraPlateauNorthern AlpsWestern Central-AlpsEastern Central-AlpsSouthern AlpsSwitzerland
avalanches SilvaProtect, modelled and assignedmain type of harvest1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %1000 ha± %
inside perimeterskidder2.241..7.5223.8303.5310.77117.614
forwarder0.4100..0.41000.3100....1.158
mobile tower yarder1.450..9.2197.2212.8352.14122.812
cable crane....12.1173.1333.5313.63122.312
helicopter0.4100..11.0188.9195.7257.82133.810
others0.4100........0.41000.771
total4.727..40.1923.31115.61414.61598.26
outside perimeterskidder117.54152.53119.1519.91220.51215.614445.02
forwarder58.0792.7512.8163.1338.5203.631178.74
mobile tower yarder9.4199.51967.2713.71523.31115.315138.45
cable crane2.2411.45062.974.12826.81019.613117.15
helicopter1.1580.77156.4736.7828.01083.85206.74
others3.2331.8451.4500.7710.41005.62513.116
total191.32258.61319.9278.24107.53143.431098.91
totalskidder119.64152.53126.6423.61124.11116.314462.62
forwarder58.4792.7513.2163.4318.5203.631179.74
mobile tower yarder10.8189.51976.4620.91226.21017.414161.24
cable crane2.2411.45075.067.22130.31023.212139.35
helicopter1.4500.77167.4745.7733.6991.65240.53
others3.6311.8451.4500.7710.41006.02413.816
total196.01258.61360.01101.53123.02158.021197.21

calculated by unit of reference: biogeographical region

© WSL, Swiss National Forest Inventory, 03.11.2014 #161952/148331
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