Calculate alpha value for distribution smoothing.

alpha-value of biodiversity feature-specific scale of landscape use. The value indicates the range of connectivity of biodiversity features. For example, it may refer to how a species uses the surrounding landscape. This value can be calculated based on, for example, the dispersal capability or the home range sizes of the species.

ds_alpha(landscape.use, ratio)

Arguments

landscape.use	Use of landscape (in relation to connectivity) in given map units. Note that if the units used here differ from the real map units of the biodiversity feature the ratio between two must be set using ratio argument.
ratio	Defines the ratio between units used in landscape.use and the actual map units in the biodiversity feature. E.g. if the map unit of a feature is m and use of landscape is defined as 1.5 km, then ratio should be set to 1000.

Value

numerical alpha.

See also

Zonation manual.

Examples

  ds_alpha(1.5, 1000)
#> [1] 0.001333333