Key:diameter

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Public-images-osm logo.svg diameter
Diameter-2-ubt.svg
Description
nominal diameter in millimeter
Used on these elements
may be used on nodesmay be used on waysshould not be used on areasshould not be used on relations
Wikidata
Status: in use

Use diameter=* for the nominal diameter of a feature.

Pipelines and hydrants

In mechanical technology (which applies to pipes, hydrants) nominal diameter is related but not equal to the inner diameter of the feature.
The European and international designation is DN (diamètre nominal/nominal diameter/Durchmesser nach Norm), in which sizes are measured in millimetres, see ISO 6708.

Trees

This key can be applied to other features, where it makes sense to use a nominal diameter.
For trees, it can be intended as the diameter of the tree trunk measured at 1.30 meters from the ground. This is conventionally done in arboricolture where it is called diameter at breast height (DBH).

Unit of measure

Unless otherwise specified, the unit of measure is mm.
This is a consequence of the original use of diameter=* for pipelines.

Using mm as the default is an exception from the standard OSM conventions for default units, which assume metre for units of length – see width=*, height=*, length=* and other similar keys. Even closely related keys such as diameter_crown=* use metre as the default unit. Because of this unfortunate inconsistency, it can avoid misunderstandings to explicitly specify the unit in the value, such as diameter=150 mm.

Inner and outer diameter

For features that have inner and outer diameters, and for which a nominal diameter is not defined, it would be appropriate to use:
inner_diameter=*
outer_diameter=*

Use in connection with

Also used as subkey