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I have exported an ESRI shapefile (polygon) to KML using R, but the resulting layer shows only the outer extent of the polygon. How can I fill in the area with a color? Any help is greatly appreciated.

The code is as follows:

setwd("G:\\GIS_SJR\\GIS Shapefiles\\Boundaries")
polygon <- readOGR(".", "20km_buffer_albers")
polygonWGS <- spTransform(polygon, CRS("+proj=longlat +ellps=WGS84 +datum=WGS84"))  
writeOGR(polygonWGS, dsn="polygonWGS.kml", layer="polygonWGS", driver="KML")
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"Limited support is available for fills, line color and other styling attributes" check their website –  A.R Jan 15 '13 at 9:17
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