Question: Were both Louis-Léger Vauthier and Johann Christian Köpping, born in the same place?
Sentence (from "Louis-Léger Vauthier"): In cartography, he is also credited with one of the earliest( if not the first) thematic map to use contour lines to display a non-geographic variable on map --- a contour map of the population of Paris in 1874.
Relevant evidence: No