Difference between revisions of "426: Geohashing"
(→Explanation) |
|||
| Line 8: | Line 8: | ||
==Explanation== | ==Explanation== | ||
| + | {{incomplete}} | ||
{{w|Geocaching}} is a sport where you have to find things hidden by other people based on geographical coordinates. Randall has had a similar idea before in [[201: Christmas GPS]]. | {{w|Geocaching}} is a sport where you have to find things hidden by other people based on geographical coordinates. Randall has had a similar idea before in [[201: Christmas GPS]]. | ||
| Line 13: | Line 14: | ||
The algorithm is built in a way that: | The algorithm is built in a way that: | ||
| − | *Makes it impossible to plan a meeting in advance | + | *Makes it impossible to plan a meeting in advance - because of the Dow. |
| − | *Changes every day | + | *Changes every day. |
| − | *Gathers people that are nearby | + | *Gathers people that are nearby - everyone within the same 1°×1° grid square gets the same position. |
Originally intended as a joke, there are people which do geohashing regularly. Please see the link to the xkcd wiki above. | Originally intended as a joke, there are people which do geohashing regularly. Please see the link to the xkcd wiki above. | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
==Transcript== | ==Transcript== | ||
| Line 36: | Line 32: | ||
:Destination Coordinates: 37.857713, -122.544544 | :Destination Coordinates: 37.857713, -122.544544 | ||
:Sample Implementation: [http://xkcd.com/geohashing/ http://xkcd.com/geohashing/] | :Sample Implementation: [http://xkcd.com/geohashing/ http://xkcd.com/geohashing/] | ||
| + | |||
| + | ==Trivia== | ||
| + | *In response to comic [[353: Python]], the Python developers implemented the module <code>antigravity</code> in version 2.7+. This module contains a reference geohashing function. | ||
{{comic discussion}} | {{comic discussion}} | ||
[[Category:Comics with color]] | [[Category:Comics with color]] | ||
Revision as of 00:35, 5 August 2013
| Geohashing |
 Title text: Saturday is game night |
Explanation
|
This is one of 53 incomplete explanations: Please help by editing it! |
Geocaching is a sport where you have to find things hidden by other people based on geographical coordinates. Randall has had a similar idea before in 201: Christmas GPS.
Geohashing is a sport created by Randall based on reaching a random location determined by an algorithm that involves the current date, location and Dow opening price.
The algorithm is built in a way that:
- Makes it impossible to plan a meeting in advance - because of the Dow.
- Changes every day.
- Gathers people that are nearby - everyone within the same 1°×1° grid square gets the same position.
Originally intended as a joke, there are people which do geohashing regularly. Please see the link to the xkcd wiki above.
Transcript
- Date (example): 2005-05-26
- That date's (or most recent) DOW opening: 10458.68
- [Concatenate, with a hyphen: 2005-05-26-10458.68]
- md5: db9318c2259923d08b672cb305440f97
- [Split it up into two pieces:]
- 0.db9318c2259923d0, 0.8b672cb305440f97
- To decimal: 0.857713..., 0.544544...
- Your location (example): 37.421542, -122.085589
- [Combine integer part of location with fractional part of hash:]
- Destination Coordinates: 37.857713, -122.544544
- Sample Implementation: http://xkcd.com/geohashing/
Trivia
- In response to comic 353: Python, the Python developers implemented the module
antigravityin version 2.7+. This module contains a reference geohashing function.
Add comment 
Create topic (use sparingly) 
Refresh Discussion
Isn't there an app for this? Or am I just confused? Unpopular Opinions (talk) 18:13, 13 February 2020 (UTC)
- There are lots of them for different platforms, in fact. 162.158.203.21 10:02, 11 January 2021 (UTC)
The official implementation (http://xkcd.org/geohashing that redirects to http://carabiner.peeron.com/xkcd/map/map.html) doesn't seem to be working anymore.
- There are other implementations, such as https://geohashing.info/ --XXOs (talk) 01:06, 8 September 2021 (UTC)
Add comment
