# areapoly

##### Signed Area of Polygon

Calculate the area of a polygon and its boundary direction.

- Keywords
- math

##### 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`

.

##### Note

This function is provided here so that users do not need to load other packages, as it is not available in the base R packages.

##### References

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

##### See Also

*Documentation reproduced from package spatialkernel, version 0.4-23, License: CC BY-NC-SA 4.0*

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