Recommendation P.833

• Geometry of path

  • one terminal in woodland
  • both terminals outside vegetation

• Loss mechanisms

  • attenuation due to scattering out of radio path (dB/km)
  • surface wave over vegetation “slab”
  • forward scatter within vegetation
  • diffraction over or around vegetation

• Dominant loss mechanism dependent on:

  • relative distances of terminals from woodland
  • thickness, type and height of foliage
  • frequency

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• Two basic geometries to consider

• Several possible propagation mechanisms

• The relative magnitude of the propagation mechanisms depends on the properties of the path

• Need to know the specific attenuation of the vegetation which itself will depend on the type of vegetation, e.g. foliage, structure.