Hi all,
My brain is on the fritz today, so I thought I would ask the community this question. Given a SpatialPolygon object in R, I know how to easily create an outer buffer (a region that has a boundary that is X distance outside of the original polygon). I need to create a "inner buffer," a polygon (or group of polygons, if the original shape dictates that) with boundaries X distance away from the original polygon but on the inside of that polygon. A crude drawing is attached below. I know I'm missing something simple in one of the R functions (like in the gBuffer function or similar), but my mind is cramping up. Any hints or long-hand ways of solving this issue?
Best to all! I hope everyone is having a great year!
--Patrick
Dear J. Patrick Kelley,
I have not tested it myself, but does gBuffer do what you want? http://www.inside-r.org/packages/cran/rgeos/docs/gBuffer
Dear Pepjin,
You are exactly correct. I just tried this. Indeed, negative values are allowed, thereby allowing for the creation of an inner buffer.
For some reason, I was reading the documentation far too quickly. Thank you for making me read it more slowly.
Best,
Patrick
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