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The ratio of a distance measured on a photograph or mosaic to the corresponding distance on the ground, classified as follows: a. very large scale--1:4,999 and larger; b. large scale--1:5,000 to 1:9,999; c. medium scale--1:10,000 to 1:24,999; d. small scale--1:25,000 to 1:49,999; e. very small scale--1:50,000 and smaller. See also scale.
Dictionary of Military and Associated Terms. US Department of Defense 2005.