OpenSeaMap/Beacon Data Model
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Beacon
A beacon is a prominent, specially constructed object forming a conspicuous mark as a fixed aid to navigation or for use in hydrographic survey (IHO Dictionary, S-32, 5th Edition, 420).
Usage
These definitions relate to node tags in the OSM database which will render on the OpenSeaMap charts. Web site: OpenSeaMap.org
Data Structure
The OSM data scheme is related to the IHO-S-57 [1] standard.
The data scheme is fairly complex. It is suggested that attributes are assigned by using either the JOSM Plugin (offline) or by using the OpenSeaMap Online editor. Both come with an easy-to-use GUI.
Beacons may be lighted or carry additional facilities (e.g. radar transponder). For further information see Lights Data Model respectively.
Lateral Beacons
Lateral Beacons mark navigable channels on port and starboard sides. Depending on the region the colours of the beacons differ. The two regions are: IALA-A (Europe, Africa, Asia) and IALA-B (America). OpenSeaMap recognizes the region depending on the coordinates of the objects.
(only)
seamark:type=beacon_lateral (Lateral beaacon) + seamark:beacon_lateral:shape=* (Beacon shape: stake | withy | tower | lattice | pile | cairn | buoyant ) + seamark:beacon_lateral:category=* (Category: port | starboard | preferred_channel_port | preferred_channel_starboard ) + seamark:beacon_lateral:colour=* (Beacon colour: red | green | red;green;red | green;red;green) + seamark:beacon_lateral:colour:pattern=* (Colour pattern: horizontal ) + seamark:topmark:shape=* (Topmark: cylinder | cone, point up ) + seamark:topmark:colour=* (Topmark colour: red | green )
Safe Water Beacons
(only)
seamark:type=beacon__safe_water (Safe Water beacon) + seamark:beacon_safe_water:shape=* (Beacon shape: stake | withy | tower | lattice | pile | cairn | buoyant ) + seamark:beacon_safe_water:colour=* (Beacon colour: red;white ) + seamark:beacon_safe_water:colour:pattern=* (Colour pattern: vertical ) + seamark:topmark:shape=* (Topmark: spherical ) + seamark:topmark:colour=* (Topmark colour: red )
Cardinal Beacons
(only)
seamark:type=beacon_cardinal (Cardinal beacon) + seamark:beacon_cardinal:shape=* (Beacon shape: stake | withy | tower | lattice | pile | cairn | buoyant ) + seamark:beacon_cardinal:category=* (Category: north | east | south | west ) + seamark:beacon_cardinal:colour=* (Beacon colour: black;yellow | black;yellow;black | yellow;black | yellow;black;yellow ) + seamark:beacon_cardinal:colour:pattern=* (Colour pattern: horizontal ) + seamark:topmark:shape=* (Topmark: 2 cones up | 2 cones base together | 2 cones down | 2 cones point together ) + seamark:topmark:colour=* (Topmark colour: black )
Isolated Danger Beacon
(only)
seamark:type=beacon_isolated_danger (Isolated Danger beacon) + seamark:beacon_isolated_danger:shape=* (Beacon shape: stake | withy | tower | lattice | pile | cairn | buoyant ) + seamark:beacon_isolated_danger:colour=* (Beacon colour: black;red;black) + seamark:beacon_isolated_danger:colour:pattern=* (Colour pattern: horizontal ) + seamark:topmark:shape=* (Topmark: 2 spheres) + seamark:topmark:colour=* (Topmark colour: black)
Special Purpose Beacon
(only)
seamark:type=beacon_special_purpose (Special Purpose beacon) + seamark:beacon_special_purpose:shape=* (Beacon shape: stake | withy | tower | lattice | pile | cairn | buoyant ) + seamark:beacon_special_purpose:colour=* (Beacon colour: yellow) + seamark:topmark:shape=* (Topmark: x-shape) + seamark:topmark:colour=* (Topmark colour: yellow | red)
Lights
For defining the light of a lighted beacon see: Openseamap/Lights Data Model
