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dismo (version 1.0-12)

Voronoi Hull: Voronoi hull model

Description

Voronoi polygons for presence/absence data

Usage

voronoiHull(p, a, ...)

Arguments

p
Presence points. Two column matrix, data.frame, or a SpatialPoints* object
a
Absence points. Must be of the same class as p
...
Addtional arguments

Value

See Also

convexHull

Examples

Run this code
r <- raster(system.file("external/rlogo.grd", package="raster"))
# presence points
p <- matrix(c(17, 42, 85, 70, 19, 53, 26, 84, 84, 46, 48, 85, 4, 95, 48, 54, 66, 74, 50, 48, 
      28, 73, 38, 56, 43, 29, 63, 22, 46, 45, 7, 60, 46, 34, 14, 51, 70, 31, 39, 26), ncol=2)

# absence points
a <- matrix(c(30, 23, 5, 5, 31, 33, 91, 63, 60, 88, 93, 97, 65, 68, 85, 97, 35, 32, 29, 55,
      3, 8, 19, 71, 49, 36, 69, 41, 20, 28, 18, 9, 5, 9, 25, 71, 8, 32, 46, 60), ncol=2)

v <- voronoiHull(p, a)
	  
x <- predict(r, v)

plot(x)
points(p, col='black', pch=20, cex=2)
points(a, col='red', pch=20, cex=2)

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