Created
November 25, 2013 15:52
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overlay shapefile on a ggmap
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| shapefile <- readOGR("chicago_city_shapefiles", "City_Boundary") | |
| shapefile.converted <- spTransform(shapefile, CRS("+proj=longlat +datum=WGS84")) | |
| p3 <- p2 + geom_polygon(aes(x = long, y = lat, group=group), alpha=.2, fill="black", | |
| data = shapefile.converted) + | |
| coord_cartesian(xlim=c(-87.96, -87.5), ylim=c(41.62, 42.05)) | |
| ggsave(plot=p3, "foodborne_p3.png", height=5, width=5) |
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