The difference between these two values for the foot is very small, two parts per million, which is hardly measurable, but not trivial when computational consistency is desired. The two are related to each other through the expression 1 international foot = 0.999 998 U.S.
Calculate map distance given map scale and ground distance Map Scale: 1: Ground Distance: Map Distance Units: At a map scale of 1:100000, 1 kilometer on the ground is equivalent to 1 millimeter on the map. It was also decided that any data expressed in feet derived from geodetic surveys within the United States would continue to bear the relationship as defined in 1893 as 1 US Survey foot = (1200/3937) meters. Map Distance: Equivalent Ground Distance: When 1 millimeter on the map is equivalent to 1 kilometer on the ground, the map scale is 1:100000. The name of this new foot is international foot. This change redefined 1 foot as equal to 0.3048 meters exactly. US Nautical Miles to Kilometers table 1 US nmi, 1.85 km 2 US nmi, 3.70 km 3 US nmi, 5.56 km 4 US nmi, 7.41 km 5 US nmi, 9.26 km 6 US nmi, 11. In mile A nautical mile was originally defined as the length on the Earth’s surface of one minute ( 1/60 of a degree) of arc along a meridian (north-south line of longitude). yard and the yard used in other countries into agreement. In 1959, the National Bureau of Standards and the United States Coast and Geodetic Survey changed the definition of the yard to bring the U.S.
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