Grid Point Code

Play

Puebla

Mexico

With a code
#GD4CT-CNWXJ
Said aloud
Puebla CNWXJ

Get the code for your door

What the code says

The Grid Point Code for Puebla is #GD4CT-CNWXJ. It names a cell 2.56 m north to south and 3.23 m east to west, centred on 19°02'52.00"N, 98°12'25.98"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 Puebla, near its centre.

Code
#GD4CT-CNWXJ
With a check character
#GD4CT-CNWXJ*6
Short form
CNWXJ
Cell centre
19.047779, -98.207217
Cell size
2.56 m by 3.23 m
Country
Mexico
Population
1,692,181

How to give this address

On a sign, a form or a delivery note

The whole code, #GD4CT-CNWXJ. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Mexico

Puebla CNWXJ: 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 5.1 km east or west of Puebla. 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

#GD4CT-CNWXJ*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 50.5 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. GD4CMetropolitan area40 km by 50.5 km
  2. GD4CTDistrict8 km by 10.1 km
  3. GD4CTCSuburb1.6 km by 2.02 km
  4. GD4CTCNA few streets320 m by 404 m
  5. GD4CTCNWBuilding64 m by 80.8 m
  6. GD4CTCNWXEntrance12.8 m by 16.2 m
  7. GD4CTCNWXJDoorway2.56 m by 3.23 m

More in Mexico

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