[R-sig-Geo] extract polygon

Ross Ahmed Fri, 29 Mar 2013 08:32:17 -0700

Lets say I have a several polygons stored in a SpatialPolygonsDataFrame
object. Using columbus¹ in maptools as an example:


setwd(system.file("shapes", package="maptools"))
columbus <- readShapeSpatial("columbus.shp²)

I want to extract a polygon 30 from columbus¹, and assign it to a new
SpatialPolygonsDataFrame object. I¹ve tried

newSPDF <- Polygons(list(columbus@polygons[[30]]), "29²)

but this didn¹t work. How can I do this?

Thanks
Ross



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[R-sig-Geo] extract polygon

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