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I'm using the cartography package in R to plot a choropleth map. However, I have a problem placing the legend, which can be placed by means of the legend.pos argument, but which always overlaps with my map. The documentation says:

legend.pos : position of the legend, one of "topleft", "top", "topright", "right", "bottomright", "bottom", "bottomleft", "left" or a vector of two coordinates in map units (c(x, y)). If legend.pos is "n" then the legend is not plotted.

(Source: https://cran.r-project.org/web/packages/cartography/cartography.pdf)

Using "right", "bottomright" etc, the legend still overlaps my map; thus, I'd like to use the coordinates version. However, I tried already lots of different combinations, but the legend does not appear in the map anymore.

My question is: How to understand "coordinates in map units"? How can I find the right coordinates to that the legend becomes visible?

Here is my code; as you can see, I use the standard "nuts0" map.

choroLayer(spdf = nuts0.spdf, df = nuts0.df, var = "cdp", 
           breaks=seq(from=0, to=240, by=40),
           col = farb, 
           colNA="grey70",
           border = "grey40", lwd = 0.5, 
           legend.pos = "bottomright",
           legend.title.txt = "No. companies",
           add = F)
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  • The 'map units' will be determined by the projection system you're in. They will either be degrees:minutes:seconds or meters. I think in R you can use proj4string(spdf) to get your crs.
    – RoperMaps
    Dec 8, 2017 at 15:46

1 Answer 1

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Correct answer from RoperMaps: Get the map units by means of proj4string(nuts0.spdf)

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