Within each longitudinl zone the transverse mercator projection is used to give co-ordinates (eastings and northings) in metres.įor the eastings, the origin is defined as a point 500,000 metres west of the central meridian of each longitudinal zone, giving an easting of 500,000 metres at the central meridian.įor the northings in the northern hemisphere, the origin is defined as the equator.įor the northings in the southern hemisphere, the origin is defined as a point 10,000,000 metres south of the equator. For example, the southern end of South America is 19F. Each of these is 8 degrees south-north, apart from zone X which is 12 degrees south-north.Īreas are referenced by quoting the longitudinal zone number, followed by the latitudinal zone letter. There are 20 latitudinal zones spanning the latitudes 80°S to 84°N and denoted by the letters C to X, ommitting the letters I and O. Each of these zones is 6 degrees wide, apart from a few exceptions around Norway and Svalbard.
There are 60 longitudinal projection zones numbered 1 to 60 starting at 180°W. UTM Grid Zones of the World compiled by Alan Morton
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