Talk:2009-04-24 48 11
From Geohashing
Revision as of 22:11, 23 April 2009 by imported>Ekorren (Very high chance of near hashes.)
Flippin' weird: Is it just me, or is Mammendorf is just as preferred by the random (?) Geohash algorithm as the surroundings of Munich's airport? 2008-07-23 48 11 2009-04-03 48 11 Map of 2009-04-23 Map of 2009-04-23 --Zb 20:07, 23 April 2009 (UTC)
- I believe noone has exactly examined that yet, but basically those repetitions seem to be an application of the Birthday Paradox. In our latitudes, the chance is about 3.8%, i.e. once in four weeks in average, that two consecutive coordinates are within of 10 km of another.
If I haven't calculated total crap (my stochastical knowledge is extremly rusty, there is hardly any iron left), the theoretical chance that within of a given week (i.e. one calendar week) two arbitrary hashes fall within of ten km of another is about 59% in a latitude 48 graticule. That means, such an event is all but uncommon.--Ekorren 22:11, 23 April 2009 (UTC)
