getcontour: Computes the Contour Polygon of a Raster Object

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

Description

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.

Usage

1

Arguments

x

an object of class asc

Value

Returns an object of class area.

Warning

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

Author(s)

Clement Calenge [email protected]

See Also

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.

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
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)

adehabitat documentation built on Nov. 28, 2017, 5:03 p.m.