|man_made = lighthouse|
|Tower that emits light to serve as a navigational aid at sea or on inland waterway|
|Rendering in OSM Carto|
|Group: man made|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
The man_made=lighthouse tag is used to identify a or former lighthouse. Although the tower structure is very common, a lighthouse building can be any shape. The common factor is that these buildings have a lamp room at the top (if they can't house people, they're likely just seamark:type=light_minor/light_major). Many lighthouses are no longer operational, so there may not be any form of light in the lamp room.
Operational lighthouses show different colours in different sectors (e.g. white, red, green), so the relative direction of the light to the viewer can be approximated. Some lights are positioned behind each other and, when brought to an alignment act as a leading light. Often, lights incorporate radio transmitters, DGPS, radar and other things too.
How to map
Full mapping may consist of one or two OSM objects. The lighthouse object describes the characteristics of the tower as a building; the light object describes the properties of the navigational light.
Following tags also may be useful:
If mapping as areas in not feasible, map building as a node.
- Main article: Seamarks/Lights
Operational navigational lights should be mapped as node and tagged using seamark:type=* tags (except rare situations lighthouses are seamark:type=light_major). If it's a sector light, every sector is described separately. The individual sectors are numbered. Every sector has a starting and an ending angle. If no angle is defined the light is visible from all directions: its angle is 360°.
Use for the attributes seamark:<object>:<number>:<attribute>=<value>
- seamark:light:1:category=* - Category Beacon as front, rear, upper, lower
- seamark:light:1:character=* - Rhythm of light
- seamark:light:1:colour=* - Colour of light
- seamark:light:1:height=* - Height in meters
- seamark:light:1:period=* - Period
- seamark:light:1:sequence=* - Sequence
- seamark:light:1:range=* - Radius in nautical miles, how far the signal can be in nominal terms
- seamark:light:1:sector_start=* - Beginning of the sector
- seamark:light:1:sector_end=* - End of the sector
Re-purposed and multi-purpose lighthouse buildings
Lighthouses are frequently very substantial buildings, and sometimes are reused for other purposes even if their navigational light is removed. Conversely, it's possible for an operational lighthouse to have other uses to the public beyond assisting navigation.
- Marine navigation
- Seamarks/Seamark Tag Values
- aeroway=navigationaid - for tagging plane navigation lights
- Official lists of lights
- Amateur lists of lights
- IHO S-57 catalog