Return points inside or outside a polygon.
pip(pts,poly,out=FALSE,bound=NULL,quiet=TRUE)A points data set
A polygon data set
If out=TRUE, return the points outside the polygon, else the points inside.
If points fall exactly on polygon boundaries, the default NULL gives arbitrary assignments. If TRUE, then all points "on" boundaries are set as within the polygon, if FALSE, outside.
Do not report which points are on boundary for non-NULL bound
pip returns the points of pts that lie inside (or outside with
out=TRUE)
the polygon poly. Compare this with inpip, which returns
the indices of
the points in the polygon, and inout which returns a logical vector
indicating whether points are inside or outside.
pip calls inout, then selects the appropriate sub-set of points.
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: http://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.