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In what data structures are the nodes' coordinates stored internally in OSM database (64bit floating point, some long integer, something else entirely...)?
What is the minimal distance that can be recorded without two points being rounded to the same location?
For gps recordings with accuracy in meters this will hardly be a problem, but as the map gets more precise, it might become one.

Obviously the longitude precision will vary between equator and poles, but still it would be good to know what the range is.

asked 25 Aug '11, 15:52

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LM_1
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Data Primitives says the longitude has 7 decimal positions for >−180 and <180.

4*10^7/2/180/10^7 = 0.01 meter = 1 centimeter (at the equator)

The same document says latitude has 7 decimal positions for >−90.0 and <90.0.

4*10^7/4/90/10^7 = 0.01 meter = 1 centimeter

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answered 25 Aug '11, 16:16

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gnurk
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edited 25 Aug '11, 16:36

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SomeoneElse ♦
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There are some hints in the OSM wiki about Nodes.

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answered 25 Aug '11, 16:12

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question asked: 25 Aug '11, 15:52

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last updated: 25 Aug '11, 16:36

NOTICE: help.openstreetmap.org is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum