|man_made = pier|
|A pier is a raised walkway over water, supported by widely spread piles or pillars.|
|Rendering in OSM Carto|
|Group: Man made|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
A pier is a raised walkway over water supported by pillars made of metal, wood or concrete, or floating and secured using chains (see wikipedia:Pier). Also referred to in some places as a 'jetty', 'raft' or 'dock'. The definition of "pier", according to the International Hydrographic Organization, is "a long, narrow structure extending into the water to afford a berthing place for vessels, to serve as a promenade, etc."
Piers can range in scale from very light structures providing a small pedestrian walkway, through to large solid structures with fixed piles extending over a mile out to sea.
Use man_made=breakwater for a solid structure designed to protect a harbour from waves and man_made=groyne for one designed to protect the shore from long-shore drift. For "piers" following the coastline, consider man_made=quay instead.
How to map
The simplest way to map a pier is as an open way tagged with man_made=pier for the length of the pier. To allow data users to render piers proportionally on different zoom levels piers can be tagged as areas . Mapping piers as an area is useful for both small and large piers; small piers tagged as open ways are often rendered too large, giving an incorrect impression of the distance between piers. If it makes sense connect the shore end of the pier to the coastline. Use shared nodes where piers connect to other piers over the water.
Lastly, usually due to ferry terminals and ferry routes, create a highway depending on how the pier is modeled. If the pier is modeled as a linear way, add a highway=* tag to the pier and ensure it connects to the main road/pedestrian network. If the pier is modeled as an area, create a separate highway=* feature that connects the ferry terminal/route to the greater road network.
If passengers wait for ferry lines at this pier and if the ferry routes are mapped as public transport relations:
- add public_transport=platform on it
- add the object to the ferry route relations, with the platform role
- Marine navigation
- on Wikipedia
- Proposed features/Seaway
- International Hydrographic Organization, IHO Dictionary, S-32, 5th Edition
- aerial photo of pier where substantive part is over land: https://www.abc.net.au/news/image/10370420-3x2-700x467.jpg