point.in.polygon {sp}R Documentation

do point(s) fall in a given polygon?

Description

verifies for one or more points whether they fall in a given polygon

Usage

point.in.polygon(point.x, point.y, pol.x, pol.y)

Arguments

point.x numerical array of x-coordinates of points
point.y numerical array of y-coordinates of points
pol.x numerical array of x-coordinates of polygon
pol.y numerical array of y-coordinates of polygon

Value

integer array; values are:

0
1
2
3

point is a vertex of pol.

References

Uses the C function InPoly(), in gstat file polygon.c; InPoly is Copyright (c) 1998 by Joseph O'Rourke. It may be freely redistributed in its entirety provided that this copyright notice is not removed.

Examples

# open polygon:
point.in.polygon(1:10,1:10,c(3,5,5,3),c(3,3,5,5))
# closed polygon:
point.in.polygon(1:10,rep(4,10),c(3,5,5,3,3),c(3,3,5,5,3))
[Package sp version 0.7-12 Index]