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I was wandering if there was a GIS that offers to locate the exact opposite location of key locations (countries, even cities ?) on earth ?

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The opposite of a location at (lambda, phi) is at (180+lambda, -phi) (where lambda is longitude and phi is latitude in degrees). What additional help in "location" would you like from the GIS? – whuber♦ Mar 16 '11 at 17:04

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Something like http://www.antipodemap.com/?

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This is what I was looking for, but Kirk's answer will be useful as well. Thanks to all of you ! – Réjôme Mar 17 '11 at 7:35
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Antipodes

This seems trivial to me, yet wikipedia's article on Antipodes goes into a lot of detail.

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does this map hold at higher latitudes? – iant♦ Mar 16 '11 at 18:37
@iant It looks like someone simply took a copy of the existing world coastlines applied the simple formula mentioned by @huber, and then added it as a layer on top of the original. A more interesting question to me is "Are there any practical uses of an antipodal map?". – Kirk Kuykendall Mar 16 '11 at 19:00
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Working out where the core of a nuclear reactor ends up if it melts (China Syndrome). – iant♦ Mar 16 '11 at 20:34

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