Grid Point Code

Play

Belford Roxo

Rio de JaneiroBrazil

With a code
#9GG9L-X3937
Said aloud
Belford Roxo X3937

Get the code for your door

What the code says

The Grid Point Code for Belford Roxo is #9GG9L-X3937. It names a cell 2.56 m north to south and 3.15 m east to west, centred on 22°45'51.04"S, 43°23'58.02"W, 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 Belford Roxo, near its centre.

Code
#9GG9L-X3937
With a check character
#9GG9L-X3937*N
Short form
X3937
Cell centre
-22.764177, -43.399450
Cell size
2.56 m by 3.15 m
Region
Rio de Janeiro
Country
Brazil
Population
518,384

How to give this address

On a sign, a form or a delivery note

The whole code, #9GG9L-X3937. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Rio de Janeiro

Belford Roxo X3937: 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 4.9 km east or west of Belford Roxo. 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

#9GG9L-X3937*N. 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 49.3 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. 9GG9Metropolitan area40 km by 49.3 km
  2. 9GG9LDistrict8 km by 9.85 km
  3. 9GG9LXSuburb1.6 km by 1.97 km
  4. 9GG9LX3A few streets320 m by 394 m
  5. 9GG9LX39Building64 m by 78.8 m
  6. 9GG9LX393Entrance12.8 m by 15.8 m
  7. 9GG9LX3937Doorway2.56 m by 3.15 m

More in Brazil

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