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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
    Commented Mar 16, 2011 at 17:04
  • You can do this with QGIS, see: gis.stackexchange.com/a/383290/88814
    – Babel
    Commented Dec 1, 2022 at 20:10

2 Answers 2

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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?
    – Ian Turton
    Commented Mar 16, 2011 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?". Commented Mar 16, 2011 at 19:00
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    Working out where the core of a nuclear reactor ends up if it melts (China Syndrome).
    – Ian Turton
    Commented Mar 16, 2011 at 20:34
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Something like https://web.archive.org/web/20120512014755/http://www.antipodemap.com/?

Edited: original site does not exist anymore but still works in Wayback Machine

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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
    Commented Mar 17, 2011 at 7:35

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