OpenSeaMap/Buoy Data Model
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Buoy
A buoy is a floating object moored to the bottom in a particular place, as an aid to navigation or for other specific purposes. (IHO Dictionary S-32 5th Edition, 565).
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.
Buoys may be lighted or carry additional facilities (e.g. radar transponder). For further information see Lights Data Model respectively.
Lateral Buoy
Lateral Buoys 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.
seamark:type=buoy_lateral (Lateral buoy) + seamark:buoy_lateral:shape=* (Buoy shape: conical | can | pillar | ... ) + seamark:buoy_lateral:category=* (Category: port | starboard | preferred_channel_port | preferred_channel_starboard ) + seamark:buoy_lateral:colour=* (Buoy colour: red | green | red;green;red | green;red;green) + seamark:buoy_lateral:colour_pattern=* (Colour pattern: horizontal ) + seamark:topmark:shape=* (Topmark: cylinder | cone, point up ) + seamark:topmark:colour=* (Topmark colour: red | green )
Safe Water Buoy
A safe water buoy is used to indicate that there is navigable water around the mark. (UKHO NP735, 5th Edition) It is vertically striped with red and white stripes. If a top mark is present, it is a red ball.
seamark:type=buoy_safe_water (Safe water buoy) + seamark:buoy_safe_water:shape=* (Buoy shape: conical | can | sphere | pillar | ... ) + seamark:buoy_safe_water:colour_pattern=* (Colour pattern: vertical ) + seamark:buoy_safe_water:colour=* (Buoy colour: red;white ) + seamark:topmark:shape=* (Topmark: sphere ) + seamark:topmark:colour=* (Topmark colour: red )
Cardinal Buoy
A cardinal buoy is used in conjunction with the compass to indicate where the mariner may find the best navigable water. It is placed in one of the four quadrants (North, East, South and West), bounded by inter-cardinal bearings from the point marked. (UKHO NP 735, 5th Edition)
seamark:type=buoy_cardinal (Cardinal buoy) + seamark:buoy_cardinal:shape=* (Buoy shape: pillar | spar ) + seamark:buoy_cardinal:category=* (Category: north | east | south | west ) + seamark:buoy_cardinal:colour_pattern=* (Colour pattern: horizontal ) + seamark:buoy_cardinal:colour=* (Buoy colour: black;yellow | black;yellow;black | yellow;black | yellow;black;yellow ) + 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 Buoy
A isolated danger buoy is a buoy moored on or above an isolated danger of limited extent, which has navigable water all around it. (UKHO NP735, 5th Edition)
seamark:type=buoy_isolated_danger (Isolated danger buoy) + seamark:buoy_isolated_danger:shape=* (Buoy shape: pillar | spar) + seamark:buoy_isolated_danger:colour_pattern=* (Colour pattern: horizontal ) + seamark:buoy_isolated_danger:colour=* (Buoy colour: black;red;black) + seamark:topmark:shape=* (Topmark: 2 spheres) + seamark:topmark:colour=* (Topmark colour: black)
Special Purpose Buoy
A special purpose buoy is primarily used to indicate an area or feature, the nature of which is apparent from reference to a chart, Sailing Directions or Notices to Mariners. (UKHO NP 735, 5th Edition)
seamark:type=buoy_special_purpose (Special purpose buoy) + seamark:buoy_special_purpose:shape=* (Buoy shape: pillar | spar | can | conical) + seamark:buoy_special_purpose:colour=* (Buoy colour: yellow) + seamark:topmark:shape=* (Topmark: x-shape) + seamark:topmark:colour=* (Topmark colour: yellow | red)
Lights
For defining the light of a lighted buoy see: Lights Data Model.
