First suggestion is to ask the question on r-sig-geo. There is the over() function in the sp package, though it may require you to put your points in a spatial class object.
For a crude brute-force approach that does not easily generalize, but might be the quickest short-term solution for you right now, and assuming your object has just a single polygon, try this: your.spdf@polygons[[1]]@Polygons[[1]]@coords That should give you a two column matrix representing your polygon. You may need to remove the last row for pol.x and pol.y, since in this implementation the last row = the first row. -Don -- Don MacQueen Lawrence Livermore National Laboratory 7000 East Ave., L-627 Livermore, CA 94550 925-423-1062 On 5/21/13 1:29 PM, "karengrace84" <kgfis...@alumni.unc.edu> wrote: >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 >follows: > >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 >package. > >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? > > > >-- >View this message in context: >http://r.789695.n4.nabble.com/point-in-polygon-help-tp4667645.html >Sent from the R help mailing list archive at Nabble.com. > >______________________________________________ >R-help@r-project.org mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
