RapidPolygonLookup (version 0.1.1)

CropSpatialPolygonsDataFrame: Crop polygons to bounding box and adds polygon centers

Description

This function serves three purposes: (i) changes the (complicated) data structure of a spatial polygon (from the sp package) to a format which is aligned with the (simpler) PBSmapping polygon format. (ii) clips/crops the polygons to a pre specified bounding box (iii) computes and adds the polygon centers for each polygon

Usage

CropSpatialPolygonsDataFrame(x, bb = NULL, verbose = 0)

Arguments

x

object of class SpatialPolygonsDataFrame

bb

bounding box to crop the polygons

verbose

level of verbosity

Value

New list with separate entries for data, polys, and poly centers

Examples

# NOT RUN {
# San Francisco:
data(california.tract10, envir = environment())
sf.polys <- CropSpatialPolygonsDataFrame(x= california.tract10, 
                                       bb= data.frame(X=c(-122.5132, -122.37), 
                                                      Y= c(37.70760, 37.81849)))

# }