Wrong. Isopleth maps and not the choropleth maps are used to show altitude.
When the distribution of a variable is continuous like the altitude, the isopleth method map is used.
Isopleth maps use lines joining the locations having equal values and hence are useful to show the change in altitude in the region.
When the distribution of a variable is discontinuous, the choropleth method map is used to show its distribution, eg. distribution of population, domestic animals, etc.
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