Wikipedia:Using maps and analogous media: Difference between revisions
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Maps can be used to source specific details about the subject, consistent with the intended purpose of the map. For example, It would be appropriate to use a geographical map to source [[elevation]]s, common names or relative locations, but not necessarily historical timelines. Maps depicting the historical growth of a city are appropriate for historical information, but may not be accurate in other details, such as geographical names. Road maps may be appropriate to source distances and routes, but not land ownership, etc.
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Use of a map to source information beyond the intended use of a map can violate Wikipedia's policies, such as [[WP:OR|no original research]], [[WP:V|verifiability]] or [[WP:reliability|reliability]]. For example, if an object does not appear in the 1950 and earlier editions of a map, but does appear in the 1951 and later editions of a map, this does not prove the year of construction was 1950, unless there is additional information in the map, as this is using the map in a different manner from its intended purpose. It would be acceptable to say "The freeway first appeared on the department of transportation's map in 1951" or "The freeway was constructed by 1951" (assuming the source has a reputation for accuracy in its map updates) in the above case. Some maps are totally unreliable if used in a manner for which they were not designed. For example, maps of mass transit systems are usually not drawn to a scale, as they are drawn to show the interconnections of a system in such a way that the map will fit in a limited space. This makes such maps unsuitable for other uses. For example, the [[Tube map|London Underground Map]] is an unreliable source for estimating the distance between two stops, but it is an excellent source for the number of stops on a given route.
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