AddRanges               Add xlim and ylim for each polygon
CropSpatialPolygonsDataFrame
                        Crop polygons to bounding box and adds polygon
                        centers
DiagnoseFailure         Visualize points that could not be mapped using
                        RapidPolygonLookup()
FindPolygonInRanges     Use range-search to map points to polygon.
RapidPolygonLookup      Efficient spatial polygon search using
                        kd-trees.
RapidPolygonLookup-package
                        Polygon lookup using kd trees
SearchForPolygon        Use kd-trees to search the nearest neighbour
                        polygons for a given set of points
california.tract10      Census Tract spatial polygons for the state of
                        California
sf.crime.2012           Sample data with lat/long information
sf.polys                Spatial polygons of San Francisco
