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Geospatial ontologies take as their domain a range of geospatial concepts such as seemingly basic things such as topological ideas of "near", "connected" and "around" or general spatial notions such as "place" or "size" and "volume". These provide summative information about spatial things. Geospatial objects may be abstracted to geometrical concepts like a point or polygon area concepts in order to be understood at different levels of granularity. Thus an area like DC can be presented as a small oval on a national map or a complex area when zoomed up close. It also includes more macro, aggregated and complex concepts like "river", "estuary", "pond" and "lake". Ontologies attempt to distinguish all of these concepts in explicit and precise ways to avoid confusions. {nid 2JO7} |
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Geospatial ontologies take as their domain a range of geospatial concepts such as geospatial objects, relations and features. Relations start with seemingly basic things such as topological ideas of "near", "connected" and "around" as well as other common spatial relationships in use, equals, disjoint, intersects, touches, crosses, within, contains, and overlaps. Spatial objects include abstract spatial notions such as "place" or "locations". Geospatial objects may be abstracted to geometrical concepts like a point or polygon area concepts in order to be understood at different levels of granularity. Thus an area like DC can be presented as a small oval on a national map or a complex area when zoomed up close. Features include "size" and "volume". These provide summative information about spatial things. Besides these simple ideas it also includes more macro, aggregated and complex concepts like "river", "estuary", "pond" and "lake". Ontologies attempt to distinguish all of these concepts in explicit and precise ways to avoid confusions. {nid 2JO7} |