This can get you started (if you're the ggplot2 sort of person). raster::getData will pull the data without a manual download. I'm not sure what you need admin-level-wise, so I went with Admin1. ggplot2::fortify takes the spatial data and makes it something ggplot2 can work with. It would normally use the polygon id, but you can substitute other identifiers from the shapefile. i went with the region name.
i made a dummy data frame for a random choropleth and then proceed to plot the base map and fill layers. viridis is a nice scale, but you'd ideally want to cut or cut2 some levels since it's unlikely you have data that should be on a continuous scale (just guessing tho). the projection i chose is a pretty gd one for that region with those lat/lon boundaries. library(raster) library(rgeos) library(maptools) library(ggplot2) library(ggalt) library(ggthemes) library(viridis) sg <- getData(country="SGP", level=1) sg_map <- fortify(sg, region="NAME_1") choro_dat <- data.frame(region=sg@data$NAME_1, value=sample(100, nrow(sg@data)), stringsAsFactors=FALSE) gg <- ggplot() gg <- gg + geom_map(data=sg_map, map=sg_map, aes(x=long, y=lat, map_id=id), color="#b2b2b200", fill="#ffffff00", size=0.15) gg <- gg + geom_map(data=choro_dat, map=sg_map, aes(fill=value, map_id=region), color="#b2b2b2", size=0.15) gg <- gg + coord_proj("+proj=aea +lon_0=103.8474") gg <- gg + scale_fill_viridis(name="Measure") gg <- gg + theme_map() gg <- gg + theme(legend.position="bottom") gg On Thu, Jan 14, 2016 at 8:03 PM, Richa Agarwal <agari...@gmail.com> wrote: > Hi Guys, > > I have some experience with R though relatively new to mapping geo data. > > I am trying to plot a heat map for Singapore and was trying to figure out > what would be the best way to start. Reading up online I downloaded a .rds > file from http://www.gadm.org/country. Though sure how to proceed now. > > Thanks > Richa > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-geo _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo