Universal Transverse Mercator coordinate system
Map projection system
Universal Transverse Mercator coordinate system
Universal Transverse Mercator (UTM) is a system for specifying locations on the Earth, based on transverse Mercator projections. It covers the part of the Earth between 84° N and 80° S, dividing it into 60 zones, each adopting a separate projection and offset by a false origin. Thus, specifying a location in UTM requires specifying the zone and the hemisphere (north or south), not only the x and y plane coordinates within the zone and hemisphere. Each UTM zone is a meridional strip that extends from 84° N to 80° S and spans 6 degrees of longitude, with a few exceptions. By using such narrow zones, and setting a scale factor of 0.9996 for the corresponding central meridians, UTM limits linear distortion to about 1 part in 1,000 within the bounds of each zone. UTM coordinates are used in many nations and regions for topographic mapping and for pinpointing locations.
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