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

  • 8
    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

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

| improve this answer | |
  • 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


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

| improve this answer | |
  • does this map hold at higher latitudes? – Ian Turton 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
  • 1
    Working out where the core of a nuclear reactor ends up if it melts (China Syndrome). – Ian Turton Mar 16 '11 at 20:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.