eeptools (version 0.3.1)

ggmapmerge: Fortify a SpatialPolygonsDataFrame

Description

Convenience function for fortifying SpatialPolygonsDataFrames for ggplot2 plotting.

Usage

ggmapmerge(mapobj, xid)

Arguments

mapobj

Name of an S4 SpatialPolygonsDataFrame

xid

Name of ID variable in the SpatialPolygonsDataFrame

Value

• An S3 dataframe suitable for using in a gggplot2 map

Details

This function requires maptools to be loaded and gpclibPermit to be TRUE. This is because it depends on the fortify method in ggplot2.

Examples

xx <- maptools::readShapePoly(system.file("shapes/sids.shp", package="maptools")[1], IDvar="FIPSNO")
plotobj<-ggmapmerge(xx,"FIPS")