[R] Problem Removing Border Lines in Maps Package

Greg Snow Greg.Snow at imail.org
Sat Oct 24 21:28:20 CEST 2009

If you don't want the county boundaries, then don't use the county map.  There is the state database that does not have county information.

If you want the counties different colors, but no dividing lines, then you may want to try the maptools and sp packages (shapefiles for the states/counties is available on the web) which use a different algorithm for storing and drawing the maps and will let you draw the outlines in the same color as the fill.

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Anthony Damico
> Sent: Saturday, October 24, 2009 12:40 PM
> To: r-help at r-project.org
> Subject: [R] Problem Removing Border Lines in Maps Package
> I'm working with the nationwide county maps data, and trying to remove
> the
> internal county boundary lines.  The only map() function parameter that
> I've
> found that gets me anywhere close to my desired result leaves small
> white
> segments on parts of the map.  I believe this is due to the low
> resolution,
> because when I look at individual states, the lty parameter solves the
> problem.  Does anyone have any idea how I might draw a United States
> county
> map without these white borders making the map look sloppy?
> library(maps)
> #county map of new jersey, with invisible county borders -- correct
> example
> map("county","new jersey", fill=TRUE , col=palette() , lty=0)
> #county map of the united states, with white county borders still
> visible
> some places
> map("county", fill=TRUE , col=palette() , lty=0)
> Thanks
> 	[[alternative HTML version deleted]]
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