Difference (from revision 15 to 16)
Changed: 36c36
http://ontolog.cim3.net/file/work/SOCoP/Pictures/Geographical%20Features%20in%20the%20Chat-80%20System%20-sowa.jpg {nid 2JP7}
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http://ontolog.cim3.net/file/work/SOCoP/Pictures/Geographical%20Features%20in%20the%20Chat-80%20System%20-sowa.jpg (see http://www.jfsowa.com/ontology/ontoshar.htm#s6) {nid 2JP7}
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Changed: 38c38
In this depiction certain macro concepts like bridge are shown as a simple point feature. It might also be an area. Thus besides simple geometrical ideas geo features also includes more macro, aggregated and complex concepts like "river", "estuary", "pond" and "lake". Knowledge about each of these would include relations to other things (e.g. each has boundaries with non-water objects, a river may connect to a lake etc.) Ontologies attempt to define and distinguish all of these concepts in explicit and precise ways to avoid confusions. It also my provide semantic glue by which diverse sources of information are brought together. At the 2009 SOCoP workshop John Bateman (University of Bremen) discussed ontolgoical issues in bringing together sources as diverse as: {nid 2JOH}
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In this particular application (Chat-80) certain macro concepts like rivers and roads are considered subtypes of lines; while bridges, towns, and airstrips are treated as a simple point feature. This may be adequate for a particular application, but is not a general treatment of geospatial feature. Thus besides simple geometrical ideas geo features need to also include adequate semantics for more macro, aggregated and complex concepts like "bridge", "river", "estuary", "pond" and "lake". Knowledge about each of these would include relations to other things (e.g. each has boundaries with non-water objects, a river may connect to a lake etc.) Ontologies attempt to define and distinguish all of these concepts in explicit and precise ways to avoid confusions. It also my provide semantic glue by which diverse sources of information are brought together. At the 2009 SOCoP workshop John Bateman (University of Bremen) discussed ontolgoical issues in bringing together sources as diverse as: {nid 2JOH}
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