Like line plots, map plots have limited utility. They can convey both data and location where the latter has relevance. The examples shown below illustrate placement of data on maps, but they are not choropleths, which are plots that color geographic regions by a gradient to convey some range. For instance, a choropleth of the United States might color each state according to its GDP per state, say with a very light green for the lowest states on that measure and a dark green for the highest states.
Foley Lardner Telemedicine 2017 [pg. 12] has included a simple map of the United States, where it applies only two colors to the states (indicating two-party consent or one-party consent). A list could have conveyed the same information as it is not apparent that geographic location has any bearing on the consent laws. This snippet includes the lower border line of the plot (called a ruler) and part of an icon in the upper right-hand portion of the page.
Another map shows up in DLA Piper Debt 2015 [pg. 15]. This one is actually an area plot with proportional circles superimposed on select countries of Europe. The same data could have been represented as a bar chart, but the map is more interesting to the eye.
DLA Piper RE 2017 [pg. 14] provides data on its respondent’s geographic profiles by means of an exploded-out map of the United States. The two jurisdictions that are not domestic regions, “International” and “Other,” tread water in the lower left.