getcontour: Computes the Contour Polygon of a Raster Object
In adehabitat: Analysis of Habitat Selection by Animals

Description Usage Arguments Value Warning Author(s) See Also Examples

getcontour computes the contour polygon of a raster object of class asc. When the object is made of several parts, the function returns one polygon per part.

1	getcontour(x)

`x`	an object of class `asc`

Returns an object of class area.

Holes in the polygons are not taken into account by the function.

Clement Calenge clement.calenge@oncfs.gouv.fr

asc for additionnal information on objects of class asc, area for additional information on objects of class area, and area2dxf to export the results toward a GIS.

data(puechabon)
kasc <- puechabon$kasc

#########################################
## Example with one object:
## Gets the first map of the "kasc" object
## Map of the elevation
elev <- getkasc(kasc, "Elevation")
image(elev)
 
## Get the contour polygon
cpol <- getcontour(elev)

## Draw the polygon
i <- cpol[,2:3]
polygon(i, col = "green", lwd = 2)

#########################################
## Example with two objects:
## home ranges of wild boar

hr <- getsahrlocs(puechabon$sahr, "hr")
u <- getkasc(hr, "Jean")
image(u)

## Get the contour polygons
p <- getcontour(u)
plot(p, lwd = 2)