Data Mashups in R by Jeremy Leipzig & Xiao-Yi Li
Author:Jeremy Leipzig & Xiao-Yi Li [Jeremy Leipzig]
Language: eng
Format: epub, pdf
Tags: COMPUTERS / Data Modeling & Design
ISBN: 9781449303525
Publisher: O'Reilly Media
Published: 2011-03-03T16:00:00+00:00
Figure 1-1. The tracts2000.shp shapefile rendered by plotPolys
Let’s spruce that up a bit (see Figure 1-2):
> plotPolys(myShapeFile,axes=FALSE,bg="beige",main="Philadelphia County\n January 2011 Foreclosures",xlab="",ylab="")
Developing the Plot
With foreclosures represented as geographic coordinates, the addPoints function in the PBSmapping package can plot each foreclosure as a point on the shapefile, provided the function is given a properly formatted data frame object.
Preparing to Add Points to Our Map
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