[R] point.in.polygon help

karengrace84 kgfisher at alumni.unc.edu
Tue May 21 22:29:55 CEST 2013

I am new to mapping with R, and I would like to use the point.in.polygon
function from the sp package, but I am unsure of how to get my data in the
correct format for the function. The generic form of the function is as

point.in.polygon(point.x, point.y, pol.x, pol.y, mode.checked=FALSE)

I have no problem with the point.x and point.y inputs. I have a list of gps
longitudes and latitudes that will go in fine. My problem is with the pol.x
and pol.y input. My polygon is currently in the form of a
SpatialPolygonsDataFrame created by inputting shp files with the rgdal

How do I get a numerical array of the x- and y-coordinates from my polygon
that will go into the point.in.polygon function?

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