choropleth: Draw a choropleth on selected regions

In GADMTools: Easy Use of 'GADM' Maps

Description

Drawing a choropleth (colored regions based on data values) with GADMTools is straightforward. You just have to select your shape(s) file(s) with gadm_loadcountries, load your data from a csv file for example, and call the choropleth function with the right arguments.

Usage

choropleth (x, data, value=NULL, breaks = NULL, steps = 5, adm.join=NULL,
            legend = NULL, labels = NULL, palette=NULL,
            title="", subtitle = NULL, caption = NULL)

Arguments

x	Object gadm_sf or gadm_sp
data	data.frame - data to plot
value	String - the name of the column in the data.frame we want to plot (eg: an incidence in epidemiology studies)
breaks	Vector of breaks values or a Sring name of a function from classIntervals (one of "sd", "equal", "pretty", "quantile", "kmeans", "hclust", "bclust", "fisher", or "jenks")
steps	Integer - number of breaks. Default = 5. If breaks is NOT NULL this value is used internally with cut().
adm.join	String - the name in your dataset joined with the field NAME_X of the map, where X is the level of the administrative boundaries. For instance if the level is about 'Districts' of a country, and your dataset has a field named "Study_Location" containing a list of districts, just do adm.join = "Study_Location".
legend	String - legend title. Default NULL.
labels	String vector labels for the legend. Default NULL
palette	String - An RColorBrewer palette name or a String vector vector of colors. Default NULL.
title	String - Title of the plot. Default is an empty string.
subtitle	String - subtitle of the plot. Default is NULL.
caption	String - caaption of the plot. Default is NULL.

Details

Since this relase, it's no longer necessary to rename the field of your dataset that is joined with the right field of the map. Just write adm.join="data_field_to_link".

Value

Object ggplot2

Note

—-

Author(s)

Jean Pierre Decorps <[e-mail]>

References

—-

See Also

classIntervals

Examples

library(GADMTools)
data("Corsica")
Cantons <- listNames(Corsica, 4)
pop <- floor(runif(length(Cantons), min=15200, max=23500))
DAT <- data.frame(Cantons, pop)

choropleth(Corsica, DAT,
           adm.join = "Cantons",
           value = "pop",
           breaks = "sd",
           palette="Oranges",
           legend = "Population",
           title="Population Cantons de Corse")

GADMTools documentation built on Aug. 5, 2021, 1:06 a.m.