Grid Point Code

Play

Hefei

AnhuiChina

With a code
#KJD9D-G8P79
Said aloud
Hefei G8P79

Get the code for your door

What the code says

The Grid Point Code for Hefei is #KJD9D-G8P79. It names a cell 2.56 m north to south and 2.90 m east to west, centred on 31°51'50.02"N, 117°16'51.01"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 Hefei, near its centre.

Code
#KJD9D-G8P79
With a check character
#KJD9D-G8P79*7
Short form
G8P79
Cell centre
31.863894, 117.280835
Cell size
2.56 m by 2.90 m
Region
Anhui
Country
China
Population
9,465,881

How to give this address

On a sign, a form or a delivery note

The whole code, #KJD9D-G8P79. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Anhui

Hefei G8P79: 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 4.5 km east or west of Hefei. 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

#KJD9D-G8P79*7. 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 45.4 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.

  1. KJD9Metropolitan area40 km by 45.4 km
  2. KJD9DDistrict8 km by 9.08 km
  3. KJD9DGSuburb1.6 km by 1.82 km
  4. KJD9DG8A few streets320 m by 363 m
  5. KJD9DG8PBuilding64 m by 72.6 m
  6. KJD9DG8P7Entrance12.8 m by 14.5 m
  7. KJD9DG8P79Doorway2.56 m by 2.9 m

More in China

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