Seamark tagging schema

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Seamark Tagging
General Information
Values
Objects
Attributes
INT-1 Cross Reference


S-100

IHO (International Hydrographic Organization) defined an universal data model S-100 with standardized objects, sub-groups of objects (called categories of objects), attributes with value lists and value formats.

Seamark Schema

There is a tag schema based on elements defined in S-100. The six-letter mnemonics used in that standard have been replaced by words or underscore separated English phrases for human readability:

The format of tags is as follows:

Scheme form Description
seamark:<object>:<attribute>=<value> <object> is the object key, <attribute> is the attribute key and <value> is the attribute value.
seamark:type=<object> Parent object. Any given node node or way way can be tagged with more than one S-100 object - e.g. a buoy with a light and topmark would be tagged with three objects and their attributes (see example below). These objects are structured as a parent-child relationship (Hierarchical database model) with one parent object and zero or more child objects. The parent object is indicated with a tag in this scheme form with a value corresponding to a valid object key. This tag must be used (once and only once) on a node or way to be rendered in nautical charts. If it is absent, the renderer will ignore all other seamark tags on that node node or way way.

Note that in the case of LIGHTS, there are two possible symbols (light_major & light_minor).
Attributes with more than one value should specify those values by a semi-colon separated list.

seamark:<attribute>=<value> Attributes that are common to all objects on a node node or way way should be specified in this scheme form.
seamark:name=<text string> e.g. there is usually only one name associated with all objects on a node node or way way. This name should be specified by this tag.

Example

An example of this tagging scheme is illustrated here. This is of a buoy with topmark and light:

seamark:type=buoy_lateral 
seamark:buoy_lateral:category=port 
seamark:buoy_lateral:shape=pillar 
seamark:buoy_lateral:colour=red 
seamark:topmark:shape=cylinder 
seamark:topmark:colour=red 
seamark:light:colour=red 
seamark:light:character=Fl
seamark:light:period=5 
seamark:name=5N