Grid Point Code
Source on GitHub

Play

Yokohama

KanagawaJapan

Grid Point Code for Yokohama
With a code
#L8R5H-37JX3
Said aloud
Yokohama 37JX3

Get the code for your door

What the code says

The Grid Point Code for Yokohama is #L8R5H-37JX3. It names a cell 2.56 m north to south and 2.79 m east to west, centred on 35°25'59.95"N, 139°39'00.01"E, and it turns back into that cell on any phone or computer by arithmetic alone: no network, no account, no lookup table.

The point used is the one GeoNames records for Yokohama, near its centre.

Code
#L8R5H-37JX3
With a check character
#L8R5H-37JX3*8
Short form
37JX3
Cell centre
35.433320, 139.650002
Cell size
2.56 m by 2.79 m
Region
Kanagawa
Country
Japan
Population
3,777,491

How to give this address

On a sign, a form or a delivery note

The whole code, #L8R5H-37JX3. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Kanagawa

Yokohama 37JX3: a name both people know, then the last five characters. They give back the exact code for anywhere within 4.0 km north or south and 4.4 km east or west of Yokohama. Further away the same five name somewhere else, which is why the whole code is what goes on a sign.

Copied by hand, or read over a phone

#L8R5H-37JX3*8. The character on the end catches any single mistyped symbol and any two neighbours swapped.

As a link or a square code

Open it on the map, move to the exact door, and add directions if the code needs help: "blue gate, second floor". The link and the square code carry them. Nothing is kept on this site.

From the city to the door

The first four characters name a cell about 40 km by 43.5 km here. Each one after that picks one of 25 inside the last, so the whole ten name a spot about the size of a doorway.

  1. L8R5Metropolitan area40 km by 43.5 km
  2. L8R5HDistrict8 km by 8.71 km
  3. L8R5H3Suburb1.6 km by 1.74 km
  4. L8R5H37A few streets320 m by 348 m
  5. L8R5H37JBuilding64 m by 69.7 m
  6. L8R5H37JXEntrance12.8 m by 13.9 m
  7. L8R5H37JX3Doorway2.56 m by 2.79 m

More in Japan

City, region and population from GeoNames, under CC BY 4.0.