Base map

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  1. A map on which information may be placed for purposes of comparison or geographical correlation. Base map was at one time applied to a class of maps now known as outline maps. It may be applied to topographic maps, also termed "mother maps," that are used in the construction of many types of maps by the addition of particular data. AGI
  2. A map of any kind showing essential outlines necessary for adequate geographic reference, on which additional or specialized information is plotted for a particular purpose; esp. a topographic map on which geologic information is recorded. AGI

Source: Dictionary of Mining, Mineral, and Related Terms

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