[R-sig-Geo] Scaling SpatialPolygons

[Rizzo, Michael]

Robert,
Thank you!  That did exactly what I needed.

Mike Rizzo

-----Original Message-----
From: Robert J. Hijmans [mailto:r.hijmans at gmail.com] 
Sent: Wednesday, July 17, 2013 12:01 PM
To: Rizzo, Michael
Cc: r-sig-geo at r-project.org
Subject: Re: [R-sig-Geo] Scaling SpatialPolygons

Mike, You can create a small inside (negative) buffer using rgeos and use that. Robert

On Wed, Jul 17, 2013 at 9:17 AM, Rizzo, Michael <Rizzo.Michael at epa.gov> wrote:
> I have a group of counties in a SpatialPolygonsDataFrame and would like to know if a function exists to scale them.  Many of the counties share a common border, and I want to color each county's border differently to distinguish them by individual categories.  The problem is the border colors overlap for adjacent counties.   I thought if I could scale the individual polygons down to 95% of their original size, the boundaries of adjacent counties would appear side by side without the overlap.
>
> I created my own function to do this but concave polygons don't scale 100% correctly and still overlap each other a little so I am hoping there may be a pre-defined function that would scale the county polygons correctly.
>
> Thank you,
> Mike Rizzo
>
>
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