perarea: Compute Perimeters of Objects of Class...

In adehabitatMA: Tools to Deal with Raster Maps

Compute Perimeters of Objects of Class "SpatialPolygonsDataFrame" and "PolyLinesDataFrame"

Description

calcperimeter computes the perimeters of polygons in objects of class SpatialPolygonsDataFrame and PolyLinesDataFrame.

Usage

  calcperimeter(x)

Arguments

x	object of class SpatialPolygonsDataFrame or PolyLinesDataFrame

Value

an object of class SpatialPolygonsDataFrame or PolyLinesDataFrame with an additionnal column containing the perimeter of the polygons/polylines.

Author(s)

Clement Calenge [e-mail]

See Also

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

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)

## Transforms the SpatialPolygons into SpatialPolygonsDataFrame
gc <- SpatialPolygonsDataFrame(gc, data.frame(x=1))

## The perimeter of this map (in units of the data):
ii <- calcperimeter(gc)
as.data.frame(ii)

adehabitatMA documentation built on Sept. 11, 2024, 8:47 p.m.