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I'm not an expert in GIS. To my understanding -180° longitude and +180° longitude are the same, meaning that if I draw two vertical lines on the map along this longitude, they will overlap.

But does this work for latitudes, too? Is -90° latitude equivalent to +90° latitude? If that is the case, as the title says this would mean that -90, -180 and 90, 180 are equivalent, is that correct?

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    Well, they may be, in whatever universe has 180 degrees north and south. But even if we reverse standard {X,Y} coordinate order, the North Pole and South Pole are not considered to be the same location. – Vince Apr 9 '17 at 16:57
  • so for longitudes you have [-180,180) and for latitudes [-90,90] ? – darkpirate Apr 9 '17 at 17:00
  • i know it's a silly question, but couldn't find the answer with google :( – darkpirate Apr 9 '17 at 17:21
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    You don't really need Google for this. It's pretty basic geometry. – John Powell Apr 9 '17 at 18:04
  • @Vince Lat/Long rather than X/Y I think is probably the reason for the coordinate order. See LatLon or LonLat, what's the “right” way to display coordinates and inputs? and ISO 6709 - Wikipedia – Midavalo Apr 9 '17 at 23:36
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No, they are not the same place. +90 would be the North pole, and -90 would be the South pole. For them to be the same place it would need to be on the equator, so 0, 180 = 0, -180

This image might help make it clear

enter image description here

From Geographic Coordinate System - Wikipedia

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