getcontour function

Computes the Contour Polygon of a Raster Object

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

getcontour(sp)

Arguments

• sp: an object of class SpatialPixelsDataFrame

Returns

Returns an object of class SpatialPolygons.

Warning

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

Author(s)

Clement Calenge clement.calenge@ofb.gouv.fr

See Also

SpatialPixelsDataFrame-class for additionnal information on objects of class SpatialPixelsDataFrame.

Examples

data(meuse.grid)
a <- SpatialPixelsDataFrame(points = meuse.grid[c("x", "y")],
                            data = meuse.grid)

## the contour of the map
gc <- getcontour(a[,1])
plot(gc)