Grid Point Code

Play

Dortmund

North Rhine-WestphaliaGermany

With a code
#PX8N2-GHRMM
Said aloud
Dortmund GHRMM

Get the code for your door

What the code says

The Grid Point Code for Dortmund is #PX8N2-GHRMM. It names a cell 2.56 m north to south and 2.13 m east to west, centred on 51°30'53.78"N, 7°27'57.56"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 Dortmund, near its centre.

Code
#PX8N2-GHRMM
With a check character
#PX8N2-GHRMM*6
Short form
GHRMM
Cell centre
51.514940, 7.465989
Cell size
2.56 m by 2.13 m
Region
North Rhine-Westphalia
Country
Germany
Population
588,462

How to give this address

On a sign, a form or a delivery note

The whole code, #PX8N2-GHRMM. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in North Rhine-Westphalia

Dortmund GHRMM: 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 3.3 km east or west of Dortmund. 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

#PX8N2-GHRMM*6. 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 33.3 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. PX8NMetropolitan area40 km by 33.3 km
  2. PX8N2District8 km by 6.65 km
  3. PX8N2GSuburb1.6 km by 1.33 km
  4. PX8N2GHA few streets320 m by 266 m
  5. PX8N2GHRBuilding64 m by 53.2 m
  6. PX8N2GHRMEntrance12.8 m by 10.6 m
  7. PX8N2GHRMMDoorway2.56 m by 2.13 m

More in Germany

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