Amsterdam

What the code says

The Grid Point Code for Amsterdam is #PX2XH-H3D35. It names a cell 2.56 m north to south and 2.09 m east to west, centred on 52°22'26.52"N, 4°53'22.87"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 Amsterdam, near its centre, and Amsterdam is the capital of Netherlands.

Code

#PX2XH-H3D35

With a check character

#PX2XH-H3D35*8

Short form

H3D35

Cell centre

52.374033, 4.889687

Cell size

2.56 m by 2.09 m

Region

North Holland

Country

Netherlands

Population

741,636

How to give this address

On a sign, a form or a delivery note

The whole code, #PX2XH-H3D35. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in North Holland

Amsterdam H3D35: 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 3.3 km east or west of Amsterdam. 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

#PX2XH-H3D35*8. 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 32.6 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. XPX2XMetropolitan area40 km by 32.6 km
2. HPX2XHDistrict8 km by 6.52 km
3. HPX2XHHSuburb1.6 km by 1.3 km
4. 3PX2XHH3A few streets320 m by 261 m
5. DPX2XHH3DBuilding64 m by 52.2 m
6. 3PX2XHH3D3Entrance12.8 m by 10.4 m
7. 5PX2XHH3D35Doorway2.56 m by 2.09 m

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