GISTools (version 0.7-4)

Point in Polygon Counts: Number of Points in Each Polygon

Description

Given a set of points, and a set of polygons, computes the number of points in each polygon.

Usage

poly.counts(pts, polys)

Arguments

pts

A SpatialPoints or SpatialPointsDataFrame object.

polys

A SpatialPolygons or SpatialPolygonsDataFrame object.

Value

A list of integers of the same length as the number of polygons in polys, giving the number of points from pts.

Examples

# Data for New Haven to use in example
data(newhaven)
# How many breaches of peace in each census block?
n.breach = poly.counts(breach,blocks)
# Compute densities and map them
choropleth(blocks,n.breach/poly.areas(blocks))