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spatialkernel (version 0.4-23)

areapoly: Signed Area of Polygon

Description

Calculate the area of a polygon and its boundary direction.

Usage

areapoly(poly)

Arguments

poly

matrix containing the x,y-coordinates of the vertices of the polygon boundary.

Value

area

positive numeric, the area of the polygon.

sign

integer, 1 if the polygon orientation is anticlockwise, -1 otherwise.

poly

copy of the passed argument poly.

References

Joseph O'Rourke, Computational Geometry in C (2nd Edition), Cambridge University Press, 2000 edition.

See Also

metre, risk.colors