area {tigers}

Area of Polygon

Description

This function computes the area of a polygon with Euclidean coordinates (e.g., UTM).

Usage

area(x, y = NULL)

Arguments

x, y

the coordinates of the points given in the usual way in R.

Details

The unit of the area are the squared unit of input coordinates by default.

Value

a single numeric value giving the area of the polygon.

Author(s)

Emmanuel Paradis

See Also

geod

Examples

XY <- rbind(c(0, 0),
            c(1, 0),
            c(.25, .25),
            c(.5, .5),
            c(1.2, .8),
            c(1, .78),
            c(0, 1))
area(XY)