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Last active Jan 10, 2016
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Block Counties - R version of
library(rgdal) # needs gdal > 1.11.0
# map theme
# use the topojson from the bl.ocks example
map = readOGR("us.json", "counties")
# build our map data frame of rects
map_df <-"rbind", lapply(map@polygons, function(p) {
b <- bbox(p) # get bounding box of polygon and put it into a form we can use later
data.frame(xmin=b["x", "min"],
xmax=b["x", "max"],
ymin=b["y", "min"],
ymax=b["y", "max"])
map_df$id <- map$id # add the id even though we aren't using it now
gg <- ggplot(data=map_df)
gg <- gg + geom_rect(aes(xmin=xmin, xmax=xmax,
ymin=ymin, ymax=ymax),
color="steelblue", alpha=0, size=0.25)
# continental us only
gg <- gg + xlim(-124.848974, -66.885444)
gg <- gg + ylim(24.396308, 49.384358)
gg <- gg + coord_map()
gg <- gg + labs(x="", y="", title="Blocky Counties")
gg <- gg + theme_map()
gg <- gg + theme(legend.position="none")
ggsave("blockycounties.svg", gg, width=11, height=6)
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