Key:content

Description
To describe the contents of a feature used to store materials. Show/edit corresponding data item.
Group: properties
Used on these elements
may be used on nodesshould not be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Documented values: 22
Useful combination
See also
Status: de facto
More details at taginfo
Tools for this tag

The key =* can be added to features used to store materials to declare the contents of the feature. It is commonly used with man_made=bunker_silo, man_made=silo and man_made=storage_tank.

Values

Tags Description Photo
=water Water.
=drinking_water Drinking water.
=chemicals Chemicals.
=oil Oil.
=fuel Liquid fuels, i.e. gasoline, diesel or heating oil
=propane Propane.
=oxygen Oxygen.
=nitrogen Nitrogen.
=liquid_nitrogen Liquid nitrogen.
=hydrocarbons Hydrocarbons (generic tag).
=gas Generic tag for any gas.
=natural_gas Natural gas (mostly methane).
=biogas biogas.
=LNG Liquefied natural gas is natural gas (predominantly methane with some mixture of ethane) that has been cooled down to liquid form.
=LPG Liquefied petroleum gas refered simply as propane and butane.
=ngl Natural Gas Liquids (condensate) like ethane, propane and butane.
=silage Silage.
=manure Manure.
=wine Wine.
=beer Beer.
=sewage Sewage.
=slurry Liquid manure/Slurry
=wine Wine.
=crop Crop. Also add crop=*
=salt Salt.
=hot_water Hot water.
=wastewater Wastewater . More general than sewage; e.g. includes industrial and agricultural waste.
More values can be found at taginfo

Avoid tagging something with =unknown. It's better to wait until the actual content is surveyed.

Possible mistakes

Both contents=* and storage=* tags are in usage. As the semantic difference is insignificant, it is recommended to focus on =* used by the majority of mappers.

  • contents=* ‒ Consider to use =* instead. 📈
If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!
  • storage=* ‒ Consider to use =* instead. 📈
If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!

See also

  • substance=* - similar key, used for pipelines and related facilities
  • inscription=* for textual content on signs
  • capacity=* for the size of a storage facility
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