Rotterdam

What the code says

The Grid Point Code for Rotterdam is #PX6X8-38L8W. It names a cell 2.56 m north to south and 2.11 m east to west, centred on 51°55'20.98"N, 4°28'45.03"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 Rotterdam, near its centre.

Code

#PX6X8-38L8W

With a check character

#PX6X8-38L8W*7

Short form

38L8W

Cell centre

51.922495, 4.479176

Cell size

2.56 m by 2.11 m

Region

South Holland

Country

Netherlands

Population

868,135

How to give this address

On a sign, a form or a delivery note

The whole code, #PX6X8-38L8W. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in South Holland

Rotterdam 38L8W: 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 Rotterdam. 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

#PX6X8-38L8W*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 33 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. XPX6XMetropolitan area40 km by 33 km
2. 8PX6X8District8 km by 6.59 km
3. 3PX6X83Suburb1.6 km by 1.32 km
4. 8PX6X838A few streets320 m by 264 m
5. LPX6X838LBuilding64 m by 52.7 m
6. 8PX6X838L8Entrance12.8 m by 10.5 m
7. WPX6X838L8WDoorway2.56 m by 2.11 m

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