Is there a GIS to locate exact opposite locations on earth?

Question

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

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
You can do this with QGIS, see: https://gis.stackexchange.com/a/383290/88814 — Babel, Dec 01 '22 at 20:10

score 9 · Answer 1 · answered Mar 16 '11 at 17:16

9

Antipodes

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

answered Mar 16 '11 at 17:16

Kirk Kuykendall

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

score 8 · Accepted Answer · edited Dec 01 '22 at 19:50

8

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

edited Dec 01 '22 at 19:50

golimar

answered Mar 16 '11 at 17:28

Ian Turton

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 07:35

2 Answers2