json.choropleth: Create a geojson choropleth of 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 json.choropleth function with the right arguments. json.choropleth creaate a GEOJSON file (output.json) that can be used with Leaflet library.

Usage

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

Arguments

x	Object 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
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 GADM spdf dataset which will be joined with a column of the data.
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.

Details

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Value

Object a lattice plot of class "trellis"

Note

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Author(s)

Jean Pierre Decorps <[e-mail]>

References

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See Also

classIntervals

Examples

##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.

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