Message-ID: <016268a8540545c5a4a5de4b9a36a86d@BLUPR09MB040.namprd09.prod.outlook.com>
Date: 2013-07-17T17:25:51Z
From: Rizzo, Michael
Subject: Scaling SpatialPolygons
In-Reply-To: <CANtt_hzf5vm0UO6k0w=r4K4Rt+9uEnHT53+GKPjj3Wm1SvenWA@mail.gmail.com>
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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>
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