This package helps to design cartographic representations such as proportional symbols, choropleth, typology, flows or discontinuities maps. It also offers several features that improve the graphic presentation of maps, for instance, map palettes, layout elements (scale, north arrow, title…), labels or legends.
The cheat sheet displays a quick overview of
cartography’s main features.
The vignette contains commented scripts on how to build various types of maps with
The following script creates a map of symbols that are proportional to values of a first variable and colored to reflect the classification of a second variable.
library(sf) library(cartography) # path to the geopackage file embedded in cartography path_to_file <- system.file("gpkg/mtq.gpkg", package="cartography") # import to an sf object mtq <- st_read(dsn = path_to_file, quiet = TRUE) ########## Draft Map # Plot the municipalities plot(st_geometry(mtq)) # Plot symbols with choropleth coloration (population & median income) propSymbolsChoroLayer(x = mtq, var = "POP", var2 = "MED") # Add a layout title(main = "Population & Wealth in Martinique, 2015", sub = "Sources: Insee and IGN - 2018")
########## Final Map # Set figure margins opar <- par(mar = c(0,0,1.2,0)) # Plot the municipalities plot(st_geometry(mtq), col="darkseagreen3", border="darkseagreen4", bg = "lightblue1", lwd = 0.5) # Plot symbols with choropleth coloration propSymbolsChoroLayer(x = mtq, var = "POP", inches = 0.4, border = "grey50", lwd = 1, legend.var.pos = "topright", legend.var.title.txt = "Population", var2 = "MED", method = "equal", nclass = 4, col = carto.pal(pal1 = "sand.pal", n1 = 4), legend.var2.values.rnd = -2, legend.var2.pos = "left", legend.var2.title.txt = "Median Income\n(in euros)") # Plot a layout layoutLayer(title="Population & Wealth in Martinique, 2015", author = "cartography 2.1.3", sources = "Sources: Insee and IGN - 2018", scale = 5, tabtitle = TRUE, frame = FALSE) # Plot a north arrow north(pos = "topleft") # restore graphics parameters par(opar)