Grid Point Code

Play

Duque de Caxias

Rio de JaneiroBrazil

With a code
#9GG9K-HN9LN
Said aloud
Duque de Caxias HN9LN

Get the code for your door

What the code says

The Grid Point Code for Duque de Caxias is #9GG9K-HN9LN. It names a cell 2.56 m north to south and 3.15 m east to west, centred on 22°47'08.01"S, 43°18'42.06"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 Duque de Caxias, near its centre.

Code
#9GG9K-HN9LN
With a check character
#9GG9K-HN9LN*L
Short form
HN9LN
Cell centre
-22.785558, -43.311683
Cell size
2.56 m by 3.15 m
Region
Rio de Janeiro
Country
Brazil
Population
866,347

How to give this address

On a sign, a form or a delivery note

The whole code, #9GG9K-HN9LN. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Rio de Janeiro

Duque de Caxias HN9LN: 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 Duque de Caxias. 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

#9GG9K-HN9LN*L. 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. 9GG9KDistrict8 km by 9.85 km
  3. 9GG9KHSuburb1.6 km by 1.97 km
  4. 9GG9KHNA few streets320 m by 394 m
  5. 9GG9KHN9Building64 m by 78.8 m
  6. 9GG9KHN9LEntrance12.8 m by 15.8 m
  7. 9GG9KHN9LNDoorway2.56 m by 3.15 m

More in Brazil

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