Difference between revisions of "Globalhash"

Revision as of 23:11, 14 October 2008

The decimals generated by the geohashing algorithm can also be used to generate a single point on the globe instead of one for each graticule and this award celebrates those lucky or mad enough to pursue that single point.

To generate this point take W30 decimals for a date (to make it global) and multiply the latitude by 180 and subtract 90, and the longitude by 360 subtracting 180. This will generate a single point on the globe which is today's only globalhash.

Proof is the same as any hash, but at the single day's coordinates. Good luck! The odds of the globalhash falling in your graticule are 1 in 64,800!

77.202493587005,164.098191419320

Example

For September 10th, the W30 decimals generated were 0.2642955149758937 and 0.45661491254372155 for latitude and longitude respectively.

0.26429551497589370 * 180 =  47.5731926957 -  90 = -42.4268073043° Latitude
0.45661491254372155 * 360 = 164.3813685160 - 180 = -15.6186314840° Longitude

Or 42.4268073043° S, 15.6186314840° W which is in the south Atlantic Ocean, near Gough Island.

Locations

KML ¦ Google Maps - all globalhashes, beginning 2008-05-26 until 2008-09-08.
Online Globalhashing Tool - Look up any date since 1928-10-01.
DAGAAG (Danatar's Approximate-Globalhash-At-A-Glance manual lookup map): If the online tool doesn't work and you want to avoid difficult calculations, just have a quick glance at the approximate location. Take the W30-adjusted coordinate offset (e.g. from the peeron map, but don't use American graticules) and compare it with the map using the black grid lines. If this gives a location at the other end of the world, you don't have to think about it any more, but if it is near you, you will have to use a calculator to get the exact location. See example here (for 2008-09-10 like in the other example above).

Winners

The following Geohashers have won this award, and have supplied proof.

Ribbon Template

Template:Globalhash

This user earned the Globalhash achievement

by reaching the globalhash for [[{{{date}}} global|{{{date}}}]].

@@ Line 22: / Line 22: @@
 *[http://relet.net/data/media/kml/globalhashes.kml KML] ¦ [http://maps.google.de/maps?f=q&hl=de&geocode=&q=http:%2F%2Frelet.net%2Fdata%2Fmedia%2Fkml%2Fglobalhashes.kml&ie=UTF8&ll=0.979032,-34.301594&spn=177.252635,360&z=1 Google Maps] - all globalhashes, beginning 2008-05-26 until 2008-09-08.
 *[http://www.drwilco.net/globalhash/map.html Online Globalhashing Tool] - Look up any date since 1928-10-01.
+* DAGAAG ([[User:Danatar|Danatar]]'s [http://wiki.xkcd.com/geohashing/Image:Globalhash-at-a-glance.png Approximate-Globalhash-At-A-Glance manual lookup map]): If the online tool doesn't work and you want to avoid difficult calculations, just have a quick glance at the approximate location. Take the W30-adjusted coordinate offset (e.g. from the peeron map, but don't use American graticules) and compare it with the map using the black grid lines. If this gives a location at the other end of the world, you don't have to think about it any more, but if it is near you, you will have to use a calculator to get the exact location. [http://wiki.xkcd.com/geohashing/Image:Globalhash-at-a-glance-example.png See example here] (for 2008-09-10 like in the other example above).
 == Winners ==