point.in.polygon: 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: point is strictly exterior to pol;
1: point is strictly interior to pol;
2: point lies on the relative interior of an edge of pol;
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.