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=== Older Events ===
 
=== Older Events ===

Revision as of 13:37, 28 May 2008

The Algorithm, as shown in xkcd comic #426.
Use this tool to find geohashing coordinates for a given area and date.
NoTerminal and Drache at the February 19, 2008 coordinates for Portland, Oregon

Welcome to the Geohashing Community Wiki. Geohashing is a Spontaneous Adventure Generator, brought to you by the xkcd webcomic.

What is this?

xkcd comic #426, published on May 21, 2008, contains an algorithm that generates random coordinates around the world1 every day. Everyone in a given region gets the same set of coordinates. As such, these coordinates can be used as destinations for adventures, à la Geocaching, or for local meetups.

For a little more interactive discussion, consider joining the #geohashing IRC channel on Foonetic.

1. For time zone issues in Europe, Africa, Asia, and Australasia, see 30W Time Zone Rule for an addendum to the algorithm rules.

How it works

Play with the coordinate calculator at http://xkcd.com/geohashing. All coordinates refer to the WGS84 datum.

Every day, the algorithm generates a new set of coordinates for each 1°×1° latitude/longitude zone (known as a graticule) in the world. They are randomly placed -- they could be in the forest, in a city, on a mountain, or even in the middle of a lake! You can use this wiki to document the daily coordinates (geohashes) you've been to.

Unless you can accurately predict the stock market down to the penny, you can't figure out what the coordinates will be ahead of time. You can first calculate a weekday's coordinates at about 9:30am ET, and on Friday morning you can calculate the coordinates for each day that weekend (sometimes even through Monday when there is a Dow holiday).

When visiting geohash locations, please respect the area you are visiting. Absolutely do not litter or otherwise disturb the natural integrity of the area. However, if possible, creating some kind of a marker out of nearby materials (i.e. cairn of stones, blair-witch-style 'stick figures', etc.) is encouraged.

Disclaimer: When any coordinates generated by the Geohashing algorithm fall within a dangerous area, are inaccessible, or would require illegal trespass, DO NOT attempt to reach them. Please research each potential location before attempting to access it. You are expected to use proper judgment in all cases and are solely responsible for your own actions. See more guidelines.

Official xkcd meetups

Official xkcd meetups happen every Saturday afternoon at that day's normal geohash coordinates. All meetups start at 4:00pm (local destination time). If you go at these times, you might encounter other readers of xkcd. Bring games!

In such cases when it is unwise to attempt to access the generated coordinates, the Saturday meetup is postponed until a day when the algorithm provides a more suitable location. Alternatively, when the coordinates fall within a body of water, you can rent a boat and win the Water Geohash achievement.

Active Graticules

Want to find geohashers in your local area? See Active Graticules for a list of graticules with active users in them.

An interactive map is available for Google Earth or on Google Maps.

Implementations

A full list of reference and practical implementations can be found on the Implementations page.

Recent and Upcoming Expeditions

The coordinates for the next Saturday meetups, scheduled for 4 May 2024, will be based on the Dow’s opening price published at 09:30 EDT (13:30 UTC) on Friday 3 May. See timeanddate.com to convert this time to your local time zone. Template:30w View expedition archives for: April 2024 | March 2024 | February 2024 | More...

Thursday 29 May 2008

Coordinates

West of -30°: 0.4647015535871903, 0.0341244048140951
East of -30°: 0.2783266160961512, 0.7411420442829273

Expeditions

Wednesday 28 May 2008

Coordinates

West of -30°: 0.6874508850272152, 0.21220759334309575
East of -30°: 0.7104414955290416, 0.11273220876887029

Expeditions

Tuesday 27 May 2008

Coordinates

West of -30°: 0.20967755786283662, 0.10144168461237785
East of -30°: 0.12536718896775, 0.577110915397159

The first day the 30W Time Zone Rule is in effect. These coordinates became available east of -30° on Friday 23 May by combination of a Dow holiday (Memorial Day) on Monday 26 May and the new 30W Time Zone Rule, which posits that Tuesday's open would come too late in the day for eastern longitudes.

Expeditions

Monday 26 May 2008

Coordinates

 0.673128104319 0.6073080067

Note: These coordinates became known on Friday 23 May due to a Dow holiday (Memorial Day) on Monday 26 May.

Expeditions

  • Brussels, Belgium - The coordinates for Brussels, Leuven and Louvain-La-Neuve are almost within reach. They are on the Boulevard de Lauzelle (the N250 motorway) just outside of Louvain-La-Neuve. We could meet by the side of the road, or very close by in the Avenue Des Clos. An ideal moment of rest for university students with exams on the way.
  • Cleveland, Ohio - In the lake. Probably not a good place to meet, unless you want to win a Water Geohash award.
  • Connecticut - A PERFECT location: Rocky Hill/South Glastonbury. Take I-91 north from New Haven or south from Hartford; take Exit 23 to West. St; turn left @ Route 99/Main St.; right @ Glastonbury Ave. to the Ferry [YAY! There's a ferry, even!!!]; after crossing, you're on Ferry Ln./Route 160; continue to South Glastonbury Center and turn left on Route 17/Main St.; take 5th left onto Red Hill Dr. into a residential dead-end; turn left, proceed to cul-de-sac there; park. Official coordinates are for the backyard of the house directly ahead of you, but for the sake of being nice, I'll be at the cul-de-sac itself. The view from that spot should be amazing, and the ferry ride makes it all worthwhile. 4PM.
  • Copenhagen, Denmark - A great spot in the middle of Copenhagen, right across the water from Christiania. Unfortunately, it's in someone's house.
  • Glasgow, United Kingdom - A few yards off Lochlibo Road in Ayrshire, just north east of Kilwinning.
  • Hamburg (West), Germany - A (the only?) junction in the small village "Klevendeich".
  • London West, United Kingdom - Just a couple of minutes walk from Amersham Station, the last stop on the Metropolitan line. Just a bit of tube hopping for anyone with easy access to an Underground station and a Bank Holiday Monday to kill. Looks like it may be in a back garden however!
  • Manchester, United Kingdom - A field with a nearby wooded area north east of Chorley, probably accessible, maybe farmland.
  • Mansfield, Ohio Located just off a low-traffic country road outside Lexington. Good spot for a meetup.
  • Newark, New Jersey - Off Route 287 in Liberty Corner, New Jersey near UAga National Golf Course. Appears to be a wooded area.
  • New York City In (or on, I suppose) someone's house in Baldwin. (Map)
  • Oslo, Norway - Located on Oscarsborg Festning, an island fortress. A return ticket with the ferry from Drøbak is 70 kr.
  • Panama North, Panama - Right in the middle of the sea... so, I wont go... not really planning on renting a boat today... but next time, we'll have a sailboat rental ready...
  • Providence, Rhode Island - A very quick hop off 95, to Route 3 North (Coventry), left on Harkney Hill, Right on Hill Farm. The map shows a tree jutting into the stream - that's it! Come join the busting of this graticule at 1pm!
    • I am going to attempt the 41, -71 graticule for Monday, May 26th, off Hill Farm Rd. in Coventry. Anyone in the RI area who has a boat - this might qualify for a Water Geohash. As I don't own a boat or possess levitation skills (necessary for Dagobah geohashing), I might be resigned to taking pictures from the very close land! Edit here if looking to meet up so times can be discussed (or is 4:00pm the default?). -Patrick
    • I'm attempting to find a way to get there at the moment, as I may not have access to transportation tomorrow. We (meaning anyone) can use my userpage to discuss any plans. --Yusuke 22:54, 25 May 2008 (UTC)-Yusuke
    • Victor Sorry man, wish I could. Work, ya know? Can you dig?
  • Richmond, Virginia - Directly on Shady Grove Road off of Pouncey Tract Road in northwest Henrico County.
  • Salinas, California - Within the city of Salinas, at the corner of Fern and Alisal streets (just N of the airport)
  • Santa Rosa, California - Inside Robert Louis Stevenson State Park, North of Calistoga. Looks like a hike, depending on where the park entrance is.
  • St. Louis, Missouri - Just west of the St. Louis Bandits Jr. A hockey arena, off of I-40, in Chesterfield, MO.
  • Sydney (West), Australia - A tree in the backyard of a house in Winmalee, near Penrith. There's a park nearby.
  • Toronto, Ontario - Right next to the runway at Pearson Airport. Unlikely to be accessible!
  • Trabuco Canyon, California - Located between Portola Hills and Trabuco Canyon, off of Live Oak Canyon Road.
  • Tucson, Arizona - Located in the middle of the normally dry San Pedro river with dirt road(possibly requiring 4WD) access near Mammoth and San Manuel. Considering recent storm activity, it may actually have flowing water in it, giving one of the few chances of getting the Water Geohash award in this graticule. Apparetly there is a ghost town called Copper Creek nearby to the east of Mammoth as well [1]
  • Vero Beach, Florida - In a farm land west of Vero beach. There is nothing close by, so if anyone else comes bring food, and games!
    • Me and my friend David are planning to travel there as be both have off from work (Yay Holiday!) If we make it we will have a surprise worthy of a great achievement. DMFlash and Kainz
  • Weymouth, United Kingdom Just outside a place called Abbotsbury, looks a tad inaccesible due to being out in the middle of some un-public-looking fields. Anyone with inside information of Abbotsbury and the surrounding area is encouraged to post, otherwise, if there's a pub in said Abbotsbury, that'll do!

Sunday 25 May 2008

Coordinates

 0.941774852844, 0.18287359767

Expeditions

Photo Gallery

Saturday 24 May 2008

Coordinates

0.1266480113970560, 0.5475331240942810

It was the first Saturday after the algorithm was published, and there was an xkcd meetup at 4:00pm in regions where the coordinates were reachable.

Expeditions

Photo Gallery

Friday 23 May 2008

Coordinates

 0.4002468981550087, 0.7227718731909889

Expeditions

2008-05-23 in Boston, Massachusetts graticule -- The coordinates in Boston are on the edge of a large, sandy region next to the Wachusett reservoir, which Randall may attempt to reach if only to figure out just what it is. Perhaps part of a tree farm?

2008-05-23 in Malone graticule -- Glub, glub, it's a scuba meeting for us.

2008-05-23 32 -117 in San Diego, California graticule -- Craig has no boat, no scuba license, and no underwater camera.

2008-05-23 in Ottawa graticule -- We claim this residential parking lot and backyard in the name of XKCD...about 4 blocks from the workplace. Video camera footage to appear on youtube soon.

2008-05-23 in Puerto Rico graticule -- Today's location is only 6 miles from the Arecibo Observatory!

2008-05-23 in Schaumburg, Illinois graticule -- Is in the front yard of an antiques store!

2008-05-23 in Tucson graticule -- Right in the middle of the catalina mountains. Interestingly though, the location happens to be right at the trail head of Palisade Trail on Organization Ridge, with paved road access ending right at it and apparent parking nearby as well. [5]

2008-05-23 Austin, Texas -- Reached by Sigma.

2008-05-23 Amsterdam, The Netherlands -- Reached by Niels.

2008-05-23 in Spokane, Washington graticule -- In a farmers cow pasture not far off Interstate 90.

Baltimore, Maryland - 2008-05-23 39 -76

Mansfield, Ohio - 2008-05-23 40 -82

Thursday 22 May 2008

Coordinates

 0.972874275358 0.238696518558

Expeditions

Dayton, Ohio -- The coordinates lie in a field just north of the Dayton Airport.

Edinburgh, Scotland -- The coordinates are in a garden between Crewe Road West and Crewe Road North in Granton.

Lincoln, Nebraska - 2008-05-22 40 -96

Melbourne East, Australia - The coordinates are just off the Monash Freeway, in the suburb that StJimmy lives in.

Minneapolis SW, Minnesota - 2008-05-22 44 -93

San Diego, California - 2008-05-22 32 -117 - The coordinates are just east of the road El Camino Real, south of the Del Mar Horse Park, on what appears to be private, undeveloped property.

Saskatoon, Saskatchewan - The coordinates are between highway 11 and the South Saskatchewan in the woods. There would be bears, ergo, we will try Friday's.

Seattle, Washington -- The coordinates are 2000ft offshore into Puget Sound, west of Everett, WA. The nearest land location is the end of Forest Park, which is accessible by Pigeon Creek Rd (N 47° 58' 12.77", W 122° 13' 48.78" or N 47.970215, W 122.230217)

Stoughton, Wisconsin -- the coordinates were near a road by Lake Kegonsa state park.

Vancouver area:

  • Vancouver, British Columbia - The coordinates are in a mountain range between Garibaldi and the Chuckchuck Reserve with no roads.
  • Victoria, British Columbia - The coordinates are in the Strait of George halfway along the Sidney-Tsawwassen ferry route. You could get very close to this geohash, in passing, using BC Ferries.
  • Bellingham, Washington - The coordinates are in a large field about 10 km south of Abbotsford and a bit east.

Older Events

View expedition archives for: April 2024 | March 2024 | February 2024 | More...

Known Issues

Several known issues are presented at Known Issues. There is an ongoing discussion on these and other issues at Talk:Main Page.

FAQ

Q: Where is the FAQ page so I can ask a Question?

A: ?

Q: I tried to use the md5sum from my unix/linux command line and the hash was not the same as the comic. What is the correct command line?

A: You probably forgot the "-n" (echo without a newline). Try this to match the example: 

 echo -n 2005-05-26-10458.68 | md5sum

The md5sum command may be called md5 instead.

Related Projects

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