[R-sig-Geo] coerce SpatialPolygonsDataFrame to SpatialLinesDataFrame for plotKML

[Anthony Fischbach]

For purposes of sharing data in a form that may be visualized on shipboard
chart plotters, 
I wish to export contours as a KML(or KMZ) of lines with a color
corresponding to a contour level.
I have generated the contours as SpatialPolygonsDataFrame from kernel
density estimators in adehabitatHR.

Is there a handy means to coerce the outlines SpatialPolygonsDataFrame into
a SpatialLinesDataFrame object to facilitate this KML/KMZ export?

#########################################################
### Here is a toy example of what I wish to have

require(adehabitatHR) 
data(puechabonsp)                   ## load animal movement data
loc <- puechabonsp$relocs  
(ud <- kernelUD(loc[,1]))           ## estimate utilization distribution
ct <- 95                                 ## Specify the contour level
ver <- getverticeshr(ud, percent=ct)  ## extract the home-range contours
class(ver)                               ## this produces a
SpatialPolygonsDataFrame object
#### Here I want to export the home range as a line into a KML/KMZ file
#### I want a function that will do this
ver.sLinesdf<-coerceToSpatialLinesDataFrame(ver)
class(ver.sLinesdf)                    ## returns SpatialLinesDataFrame
plotKML(ver.sLinesdf, colour=ct)  ## Generate KMZ and color using the
contour level

#########################################################



-----
Tony Fischbach, Wildlife Biologist
Walrus Research Program
Alaska Science Center
U.S. Geological Survey
4210 University Drive
Anchorage, AK 99508-4650

AFischbach at usgs.gov
http://alaska.usgs.gov/science/biology/walrus
--
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