Tlalpan
Mexico CityMexico
- With a code
#GD36F-PR7DD- Said aloud
- Tlalpan
PR7DD
What the code says
The Grid Point Code for Tlalpan is #GD36F-PR7DD. It names a cell 2.56 m north to south and 3.23 m east to west, centred on 19°17'42.49"N, 99°09'43.40"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 Tlalpan, near its centre.
- Code
#GD36F-PR7DD- With a check character
#GD36F-PR7DD*9- Short form
PR7DD- Cell centre
- 19.295136, -99.162056
- Cell size
- 2.56 m by 3.23 m
- Region
- Mexico City
- Country
- Mexico
- Population
- 574,577
How to give this address
- On a sign, a form or a delivery note
The whole code,
#GD36F-PR7DD. It needs nothing else: no city, no street, no network to read it back.- Said aloud, in Mexico City
Tlalpan PR7DD: 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 5.0 km east or west of Tlalpan. 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
#GD36F-PR7DD*9. 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 50.4 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.
- GD36Metropolitan area40 km by 50.4 km
- GD36FDistrict8 km by 10.1 km
- GD36FPSuburb1.6 km by 2.02 km
- GD36FPRA few streets320 m by 403 m
- GD36FPR7Building64 m by 80.7 m
- GD36FPR7DEntrance12.8 m by 16.1 m
- GD36FPR7DDDoorway2.56 m by 3.23 m
More in Mexico
City, region and population from GeoNames, under CC BY 4.0.