Ordnance Survey & Ontologies
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Transcript of Ordnance Survey & Ontologies
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Ordnance Survey & Ontologies
Dr John Goodwin
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Ordnance Survey and Linked Data
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disconnected (DC) externally connected (EC) equal (EQ) partially overlapping (PO) tangential proper part (TPP) tangential proper part inverse (TPPi) non-tangential proper part (NTPP) non-tangential proper part inverse (NTPPi)
a b
PO(a,b)
a b
EC(a,b)
a b
EQ(a,b)
a b
DC(a,b)
a
b
TPP(a,b)
b
a
TPPi(a,b)
a
b
NTPP(a,b)
b
a
NTPPi(a,b)
Region Connection Calculus
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Spatial Relations
DC Disjoint EC TouchesEQ EqualPO Partial overlapsTPP WithinTPPi ContainsNTPP WithinNTPPi Contains
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Semantics in OWLSpatial Relations Characteristics
disjoint symmetric
touches symmetric
partiallyOverlaps symmetric
equals symmetric, transitive, reflexive
contains transitive
within transitive
property Ο equals → property
equals Ο property → property
within Ο disjoint → disjoint
disjoint Ο contains → disjoint
partiallyOverlaps Ο within → overlaps
contains Ο touches → connected
Etc…
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Administrative GeographyObjectProperty: inCounty
SubPropertyOf:
within
Characteristics:
Functional
Range:
County or GreaterLondonAuthority
ObjectProperty: ward
SubPropertyOf:
contains
SubPropertyChain:
district o ward
Range:
UnitaryAuthorityElectoralDivision or Ward
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Class: District
SubClassOf:
CivilAdministrativeArea,
ward some DistrictWard,
inCounty exactly 1 County
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Geometry
• Should complex geometries, e.g. Polygons etc. be stored in the graph?
Feature Geometry
Polygon Line Point
extent asGMLXML Literal