Convenience function for fortifying SpatialPolygonsDataFrames for ggplot2 plotting.
ggmapmerge(mapobj, xid)
Name of an S4 SpatialPolygonsDataFrame
Name of ID variable in the SpatialPolygonsDataFrame
An S3 dataframe suitable for using in a gggplot2 map
This function requires maptools to be loaded and gpclibPermit to be TRUE. This is because it depends on the fortify method in ggplot2.
gpclibPermit
TRUE
fortify
ggplot2
# NOT RUN { xx <- maptools::readShapePoly(system.file("shapes/sids.shp", package="maptools")[1], IDvar="FIPSNO") plotobj <- ggmapmerge(xx,"FIPS") # }
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