Grid Point Code

Play

Heroica Matamoros

TamaulipasMexico

With a code
#GDX80-DK3TK
Said aloud
Heroica Matamoros DK3TK

Get the code for your door

What the code says

The Grid Point Code for Heroica Matamoros is #GDX80-DK3TK. It names a cell 2.56 m north to south and 3.08 m east to west, centred on 25°52'46.97"N, 97°30'14.97"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 Heroica Matamoros, near its centre.

Code
#GDX80-DK3TK
With a check character
#GDX80-DK3TK*9
Short form
DK3TK
Cell centre
25.879715, -97.504159
Cell size
2.56 m by 3.08 m
Region
Tamaulipas
Country
Mexico
Population
510,739

How to give this address

On a sign, a form or a delivery note

The whole code, #GDX80-DK3TK. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Tamaulipas

Heroica Matamoros DK3TK: 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 4.8 km east or west of Heroica Matamoros. 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

#GDX80-DK3TK*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 48.1 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. GDX8Metropolitan area40 km by 48.1 km
  2. GDX80District8 km by 9.61 km
  3. GDX80DSuburb1.6 km by 1.92 km
  4. GDX80DKA few streets320 m by 385 m
  5. GDX80DK3Building64 m by 76.9 m
  6. GDX80DK3TEntrance12.8 m by 15.4 m
  7. GDX80DK3TKDoorway2.56 m by 3.08 m

More in Mexico

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