[R-sig-Geo] generating object with multiple polygons

Tom Philippi tephilippi at gmail.com
Sun Apr 3 22:15:12 CEST 2016

If you want a SpatialPolygonsDataFrame with both slices of polygons, you
can use spatial rbind.  The issue that may trip you up is that your slice1
and slice2 objects might not have unique polygon IDs.  Perhaps the simplest
solution is to use the spChFIDs in sp, with some prefix distinguishing
slice1 from slice2.  I assume you're generating some attributes as
variables in the data frame to distinguish the different polygons; you can
use those values as the prefix.  You can google this, or start with:

Tom 2

On Sun, Apr 3, 2016 at 6:53 AM, Karla Shikev <karlashikev at gmail.com> wrote:

> Dear all,
> This might be a newbie question, so I'd appreciate your patience with this.
> I'm obtaining climatic data from worldclim and generating polygons based on
> different climatic limits:
> library(raster)
> xx<-getData('worldclim', var='bio', res=10)$bio1
> slice1 <- rasterToPolygons(xx, fun = function(x) {x > 200 & x < 260})
> slice2 <- rasterToPolygons(xx, fun = function(x) {x > 250 & x < 300})
> Now, I'd like to combine "slice1" and "slice2" into the same
> "SpatialPolygonsDataFrame" object, but I do not want to merge them.
> Any help will be greatly appreciated.
> Karla
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