Training Manual in Topography, Map Reading and Reconnaissance (Classic Reprint) - Tapa blanda

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Excerpt from Training Manual in Topography, Map Reading and Reconnaissance

Note 3 - Our Field Service Regulations provide that the contour interval should be 10 feet for a military sketch made on a scale of 6 inches to the mile, 20 feet for. A sketch on a scale of 3 inches to the mile,,and, in general, the proper contour interval for any scale isto be found by dividing 60 by the number of inches on the scale which represents a mile on the ground. This system of scales is known as the United States Army Normal System. The British Army have a similar system, using 50 as the base instead of 60. In small-scale mapping these systems are usually not adhe to. The United States Geological Survey use an interval of 20 feet for their (about an inch to the mile) sheets, reducing this to 10 or even 5 feet in very flat country and increasing it for mountainous country.

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