secr (version 3.2.1)

polyarea: Area of Polygon(s)

Description

Area of a single closed polygon (simple x-y coordinate input) or of multiple polygons, possibly with holes.

Usage

polyarea(xy, ha = TRUE)

Arguments

xy

dataframe or list with components `x' and `y', or a SpatialPolygons or SpatialPolygonsDataFrame object from package sp

ha

logical if TRUE output is converted from square metres to hectares

Value

A scalar.

Details

For SpatialPolygons or SpatialPolygonsDataFrame objects, the packages sp and rgeos are used.

See Also

buffer.contour

Examples

# NOT RUN {
polyarea(make.grid(hollow = TRUE))
# }