3 Examples of thematic maps

3.1 Proportional Symbols

propSymbolsLayer() displays symbols with areas proportional to a quantitative variable (stocks). Several symbols are available (circles, squares, bars). The inches argument is used to customize the symbols sizes.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# plot municipalities (only borders are plotted)
plot(st_geometry(mtq), col = "grey80", border = "grey")
# plot population
propSymbolsLayer(
  x = mtq, 
  var = "POP", 
  inches = 0.25, 
  col = "brown4",
  legend.pos = "topright",  
  legend.title.txt = "Total population"
)
# layout
layoutLayer(title = "Population Distribution in Martinique",
            sources = "Sources: Insee and IGN, 2018",
            author = paste0("cartography ", packageVersion("cartography")),
            frame = FALSE, north = FALSE, tabtitle = TRUE)
# north arrow
north(pos = "topleft")

3.2 Choropleth Map

In choropleth maps, areas are shaded according to the variation of a quantitative variable. They are used to represent ratios or indices.

choroLayer() displays choropleth maps . Arguments nclass, method and breaks allow to customize the variable classification. getBreaks() allow to classify outside of the function itself. Colors palettes are defined with col and a set of colors can be created with carto.pal() (see also display.carto.all()).

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# population density (inhab./km2) using sf::st_area()
mtq$POPDENS <- 1e6 * mtq$POP / st_area(mtq)
# plot municipalities (only the backgroung color is plotted)
plot(st_geometry(mtq), col = NA, border = NA, bg = "#aadaff")
# plot population density
choroLayer(
  x = mtq, 
  var = "POPDENS",
  method = "geom",
  nclass=5,
  col = carto.pal(pal1 = "sand.pal", n1 = 5),
  border = "white", 
  lwd = 0.5,
  legend.pos = "topright", 
  legend.title.txt = "Population Density\n(people per km2)",
  add = TRUE
) 
# layout
layoutLayer(title = "Population Distribution in Martinique", 
            sources = "Sources: Insee and IGN, 2018",
            author = paste0("cartography ", packageVersion("cartography")), 
            frame = FALSE, north = FALSE, tabtitle = TRUE, theme= "sand.pal") 
# north arrow
north(pos = "topleft")

3.3 Colored Pencil and Typologies Map

getPencilLayer() transforms POLYGONS or MULTIPOLYGONS in MULTILINESTRINGS. This function creates a layer that mimicks a pencil hand-drawing.

typoLayer() displays a typology map of a qualitative variable. legend.values.order is used to set the modalities order in the legend.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# transform municipality multipolygons to (multi)linestrings
mtq_pencil <- getPencilLayer(
  x = mtq, 
  size = 400, 
  lefthanded = F
)
# plot municipalities (only the backgroung color is plotted)
plot(st_geometry(mtq), col = "white", border = NA, bg = "lightblue1")
# plot administrative status
typoLayer(
  x = mtq_pencil, 
  var="STATUS",  
  col = c("aquamarine4", "yellow3","wheat"), 
  lwd = .7,
  legend.values.order = c("Prefecture",
                          "Sub-prefecture", 
                          "Simple municipality"),
  legend.pos = "topright",
  legend.title.txt = "", 
  add = TRUE
)
#  plot municipalities
plot(st_geometry(mtq), lwd = 0.5, border = "grey20", add = TRUE, lty = 3)
# labels for a few  municipalities
labelLayer(x = mtq[mtq$STATUS != "Simple municipality",], txt = "LIBGEO", 
           cex = 0.9, halo = TRUE, r = 0.15)
# title, source, author
layoutLayer(title = "Administrative Status",
            sources = "Sources: Insee and IGN, 2018", 
            author = paste0("cartography ", packageVersion("cartography")), 
            north = FALSE, tabtitle = TRUE, postitle = "right", 
            col = "white", coltitle = "black") 
# north arrow
north(pos = "topleft")

3.4 Proportional Symbols and Choropleth Map

propSymbolsChoroLayer() creates a map of symbols that are proportional to values of a first variable and colored to reflect the classification of a second variable. A combination of propSymbolsLayer() and choroLayer() arguments is used.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# 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", 
  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\nIncome\n(in euros)"
) 
# 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)
# north arrow
north(pos = "topleft")

3.5 Proportional Symbols and Typology Map

propSymbolsTypoLayer() creates a map of symbols that are proportional to values of a first variable and colored to reflect the modalities of a second qualitatice variable. A combination of propSymbolsLayer() and typoLayer() arguments is used.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# Plot the municipalities
plot(st_geometry(mtq), col="#f2efe9", border="#b38e43", bg = "#aad3df", 
     lwd = 0.5)
# Plot symbols with choropleth coloration
propSymbolsTypoLayer(
  x = mtq, 
  var = "POP", 
  inches = 0.5,
  symbols = "square",
  border = "white",
  lwd = .5,
  legend.var.pos = "topright", 
  legend.var.title.txt = "Population",
  var2 = "STATUS",
  legend.var2.values.order = c("Prefecture", "Sub-prefecture", 
                               "Simple municipality"),
  col = carto.pal(pal1 = "multi.pal", n1 = 3),
  legend.var2.pos = c(692000, 1607000), 
  legend.var2.title.txt = "Administrative\nStatus"
) 
# layout
layoutLayer(title="Population Distribution in Martinique", 
            author = "cartography 2.1.3", 
            sources = "Sources: Insee and IGN, 2018", 
            scale = 5, tabtitle = TRUE, frame = FALSE)
# north arrow
north(pos = "topleft")

3.6 Label Map

labelLayer() is dedicated to the display of labels on a map. The overlap = FALSE argument displays non overlapping labels.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# plot municipalities
plot(st_geometry(mtq), col = "#e4e9de", border = "darkseagreen4", 
     bg = "lightblue1", lwd = 0.5)
# plot labels
labelLayer(
  x = mtq, 
  txt = "LIBGEO", 
  col= "black", 
  cex = 0.7, 
  font = 4,
  halo = TRUE, 
  bg = "white", 
  r = 0.1, 
  overlap = FALSE, 
  show.lines = FALSE
)
# map layout
layoutLayer(
  title = "Municipalities of Martinique", 
  sources = "Sources: Insee and IGN, 2018",  
  author = paste0("cartography ", packageVersion("cartography")), 
  frame = FALSE,
  north = TRUE, 
  tabtitle = TRUE, 
  theme = "taupe.pal"
)

3.7 Links Map

getLinkLayer() creates a link layer from an sf object and a link data.frame (long format).
gradLinkTypoLayer() displays graduated and colored links.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# path to the csv file embedded in cartography
path_to_csv <- system.file("csv/mob.csv", package="cartography")
# import to a data.frame
mob <- read.csv(path_to_csv)
# select workplaces with administrative status = Prefecture or Sub-prefecture
mob <- mob[mob$sj != "Simple municipality",]
# create an sf object of links
mtq_mob <- getLinkLayer(
  x = mtq, 
  xid = "INSEE_COM", 
  df = mob, 
  dfid = c("i","j")
)
# set figure background color
par(bg="grey25")
# plot municipalities
plot(st_geometry(mtq), col = "grey13", border = "grey25", 
     bg = "grey25", lwd = 0.5)
# plot graduated links
gradLinkTypoLayer(
  x = mtq_mob, 
  xid = c("i", "j"),
  df = mob,
  dfid = c("i","j"),
  var = "fij", 
  breaks = c( 100,  500, 1200, 2500, 4679.0),
  lwd = c(1,4,8,16),
  legend.var.pos = "left",
  legend.var.title.txt = "Nb. of\nCommuters",
  var2 = "sj", 
  col = c("grey85", "red4"),
  legend.var2.title.txt = "Workplace",
  legend.var2.pos = "topright"
) 
# map layout
layoutLayer(title = "Commuting to Prefectures in Martinique", 
            sources = "Sources: Insee and IGN, 2018",  
            author = paste0("cartography ", packageVersion("cartography")), 
            frame = FALSE, col = "grey25", coltitle = "white",
            tabtitle = TRUE)

3.8 Isopleth Map

smoothLayer() is deprecated. See the package potential instead.

Isopleth maps are based on the assumption that the phenomenon to be represented has a continuous distribution. These maps use a spatial interaction modeling approach which aims to compute indicators based on stock values weighted by distance. It allows a spatial representation of the phenomenon independent from the initial heterogeneity of the territorial division.

3.9 Grid Map

The grid-cell method is an option to overcome the arbitrariness and irregularity of an administrative division. It highlights the main trends in the data spatial distribution, splitting the territory in regular blocks. Statistical values are distributed over a regular grid. Cell values are classified and then displayed in areas of color. The principle adopted here is to set each cell’s value with a proportion of the initial geometrical units it overlay (share of intersected area).
getGridLayer() builds a regular grid (squares or hexagons) based on a spatial object and computes data that match the grid layer. choroLayer() is then used to display the grid on a choropleth map.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# Create a grid layer, cell size area match the median municipality area 
mygrid <- getGridLayer(
  x = mtq, 
  cellsize = median(as.numeric(st_area(mtq))), 
  var = "POP",
  type = "hexagonal"
)
# Compute population density in people per km2
mygrid$POPDENS <- 1e6 * mygrid$POP / mygrid$gridarea
# plot municipalities (only the backgroung color is plotted)
plot(st_geometry(mtq), col = NA, border = NA, bg = "#deffff")
# Plot the population density
choroLayer(x = mygrid, var = "POPDENS", method = "geom", nclass=5, 
           col = carto.pal(pal1 = "turquoise.pal", n1 = 5), border = "grey80", 
           lwd = 0.5, legend.pos = "bottomleftextra", add = TRUE,
           legend.title.txt = "Population Density\n(people per km2)") 
layoutLayer(title = "Population Distribution in Martinique", 
            sources = "Sources: Insee and IGN, 2018",
            author = paste0("cartography ", packageVersion("cartography")), 
            frame = FALSE, north = FALSE, tabtitle = TRUE,
            theme = "turquoise.pal")
# north arrow
north(pos = "topleft")

3.10 Discontinuities Map

Discontinuities maps are based on the variation of a phenomena between contiguous units. This kind of representation focuses spatial breaks. The discontinuity intensity is expressed by the borders’ thickness.
getBorders() is used to build a spatial object of borders between units. Each resulting borders contains the ids of its two neighboring units. It is possible to complement these borders with getOuterBorders() to compute borders between non-contiguous units (e.g. maritime borders). discLayer() computes and displays discontinuities, lines widths reflect the ratio or the absolute difference between values of an indicator in two neighboring units.

library(sf)
library(cartography)
# path to the geopackage file embedded in cartography
path_to_gpkg <- system.file("gpkg/mtq.gpkg", package="cartography")
# import to an sf object
mtq <- st_read(dsn = path_to_gpkg, quiet = TRUE)
# Compute the population density (inhab./km2) using sf::st_area()
mtq$POPDENS <- as.numeric(1e6 * mtq$POP / st_area(mtq))
# Get a SpatialLinesDataFrame of countries borders
mtq.contig <- getBorders(mtq)
# plot municipalities (only the backgroung color is plotted)
plot(st_geometry(mtq), col = NA, border = NA, bg = "lightblue1", 
     xlim = c(690574, 745940))
# Plot the population density with custom breaks
choroLayer(x = mtq, var = "MED",
           breaks = c(min(mtq$MED), seq(13000, 21000, 2000), max(mtq$MED)),
           col = carto.pal("green.pal", 6),border = "white", lwd = 0.5, 
           legend.pos = "topright", legend.title.txt = "Median Income\n(euros)",
           add = TRUE)
# Plot discontinuities
discLayer(
  x = mtq.contig, 
  df = mtq, 
  var = "MED",
  type = "rel", 
  method = "geom", 
  nclass = 3,
  threshold = 0.4,
  sizemin = 0.7, 
  sizemax = 6, 
  col = "red4",
  legend.values.rnd = 1, 
  legend.title.txt = "Relative\nDiscontinuities", 
  legend.pos = "right",
  add = TRUE
)
# Layout
layoutLayer(title = "Wealth Disparities in Martinique, 2015", 
            author =  paste0("cartography ", packageVersion("cartography")),
            sources = "Sources: Insee and IGN, 2018",
            frame = FALSE, scale = 5, tabtitle = TRUE,theme = "grey.pal")
# north arrow
north(pos = "topleft")

3.11 Mapping `sp` Objects

SpatialPointsDataFrame and SpatialPolygonsDataFrame (from sp) are handled through the spdf argument if the variable is contained within the Spatial*DataFrame and through spdf, spdfid, df, dfid if the variable is in a separate data.frame that needs to be joined to the Spatial*DataFrame.

library(sp)
## The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
## which was just loaded, will retire in October 2023.
## Please refer to R-spatial evolution reports for details, especially
## https://r-spatial.org/r/2023/05/15/evolution4.html.
## It may be desirable to make the sf package available;
## package maintainers should consider adding sf to Suggests:.
## The sp package is now running under evolution status 2
##      (status 2 uses the sf package in place of rgdal)
library(cartography)
data("nuts2006")
# Plot a layer with the extent of the EU28 countries with only a background color
plot(nuts0.spdf, border = NA, col = NA, bg = "#A6CAE0")
# Plot non european space
plot(world.spdf, col  = "#E3DEBF", border = NA, add = TRUE)
# Plot Nuts2 regions
plot(nuts0.spdf, col = "grey60",border = "white", lwd = 0.4, add = TRUE)
# plot the countries population
propSymbolsLayer(
  spdf = nuts0.spdf, 
  df = nuts0.df, 
  spdfid = "id", 
  dfid = "id", 
  var = "pop2008", 
  legend.pos = "topright", 
  col = "red4", 
  border = "white", 
  legend.title.txt = "Population" 
)
# layout
layoutLayer(title = "Population in Europe, 2008",
            sources = "Data: Eurostat, 2008",
            author =  paste0("cartography ", packageVersion("cartography")),
            scale = 500, frame = TRUE, col = "#688994") 
# north arrow
north("topleft")

cartography

Timothée Giraud, Nicolas Lambert

2023-09-14

1 Introduction

2 Features

3 Examples of thematic maps

3.1 Proportional Symbols

3.2 Choropleth Map

3.3 Colored Pencil and Typologies Map

3.4 Proportional Symbols and Choropleth Map

3.5 Proportional Symbols and Typology Map

3.6 Label Map

3.7 Links Map

3.8 Isopleth Map

3.9 Grid Map

3.10 Discontinuities Map

3.11 Mapping `sp` Objects

4 Datasets

cartography

Timothée Giraud, Nicolas Lambert

2023-09-14

1 Introduction

2 Features

3 Examples of thematic maps

3.1 Proportional Symbols

3.2 Choropleth Map

3.3 Colored Pencil and Typologies Map

3.4 Proportional Symbols and Choropleth Map

3.5 Proportional Symbols and Typology Map

3.6 Label Map

3.7 Links Map

3.8 Isopleth Map

3.9 Grid Map

3.10 Discontinuities Map

3.11 Mapping sp Objects

4 Datasets

3.11 Mapping `sp` Objects