How do I find out (calculate somehow) the central meridian for a UTM zone for which I know the zone number?
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3Read how the zones are defined dmap.co.uk/utmworld.htm and use Excel or something.– user30184Dec 13, 2021 at 19:25
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2 Answers
The central meridian of a 6 degree wide UTM zone will be given by:
(zone_number * 6 - 180) - 3
answered Dec 14, 2021 at 8:33
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Is it something that reliably works for every zone number? I'm asking 'cause there's a script to convert lat/lng to zone number and it is said to have weird exceptions.– jayarjoDec 14, 2021 at 15:04
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should work for all of the 6 degree wide ones which is all anyone except NATO use.– Ian Turton ♦Dec 14, 2021 at 15:09
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oh... NATO countries you mean? or you mean they have their own twisted version of UTM?– jayarjoDec 14, 2021 at 18:37
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1No, they are the only people who use the wierd ones north of Norway– Ian Turton ♦Dec 14, 2021 at 19:07
EPSG lists the Central Meridian in its Coordinate System Definitions: https://epsg.io/ Or you can see all the UTM Grid Zones of the World: http://www.dmap.co.uk/utmworld.htm
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So I cannot do without external information? I was looking to have it local somehow in just one utility, 'cause in theory all the information should already be included in zone number and coordinates :/– jayarjoDec 14, 2021 at 6:18
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I was looking for an algorithm basically to use in my conversions script.– jayarjoDec 14, 2021 at 6:25