What are the background/geography and foreground/data parts of a map called?

المشرف العام

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Consider a geographical map, e.g. a street map or satellite map, overlaid with some data, e.g. crime density or distance to closest voting booth.

The former part is only used to orient the reader, so that he knows which part of the map corresponds to which geographical location. The latter part contains the actual data that the author wishes to visualize.

What are these two parts called?



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