Originally Posted by

**cacaiste**
What 24K stands for?

1:24,000-scale USGS maps. (24 K)

The scale of the map is determined by the amount of real-world area covered by the map. For example, 7.5 minute topographic quadrangles put out by the U.S. Geological Survey have a scale of 1:24,000. This type of scale is known as a ratio scale and what it means is that one inch on the map is equal to 24,000 inches (or 2000 ft) in the real world. Actually, it means that one of anything [cm, foot, etc.) on the map is equal to 24,000 of the same thing on the map. Another way of writing this would be a fractional scale of 1/24,000, meaning that objects on the map have been reduced to 1/24,000th of their original size.

Other map scales in common use for topographic maps are 1:62,500 (15 minute quadrangle), 1:100,000 (one degree sheet) and 1: 250,000 (2° sheet). The smaller the ratio is between distances on the map and distances in the real world, the smaller the scale of the map is said to be. In other words, a map with a scale of 1:250,000 is a smaller scale map than a 1:24,000 scale map, but it covers a larger real-world area.

infos from

Code:

http://geology.isu.edu/geostac/Field_Exercise/topomaps/map_scale.htm

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