CropSpatialPolygonsDataFrame: Crop polygons to bounding box and adds polygon centers

In RapidPolygonLookup: POLYGON LOOKUP USING KD TREES

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

Author(s)

Markus Loecher <[e-mail]> and Madhav Kumar <[e-mail]>

Examples

# 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)))

RapidPolygonLookup documentation built on May 2, 2019, 7:08 a.m.