Ordnance Survey & Ontologies Dr John Goodwin
Apr 01, 2015
Ordnance Survey & Ontologies
Dr John Goodwin
Ordnance Survey and Linked Data
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
Spatial Relations
DC Disjoint EC TouchesEQ EqualPO Partial overlapsTPP WithinTPPi ContainsNTPP WithinNTPPi Contains
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…
Administrative GeographyObjectProperty: inCounty
SubPropertyOf:
within
Characteristics:
Functional
Range:
County or GreaterLondonAuthority
ObjectProperty: ward
SubPropertyOf:
contains
SubPropertyChain:
district o ward
Range:
UnitaryAuthorityElectoralDivision or Ward
Class: District
SubClassOf:
CivilAdministrativeArea,
ward some DistrictWard,
inCounty exactly 1 County
Geometry
• Should complex geometries, e.g. Polygons etc. be stored in the graph?
Feature Geometry
Polygon Line Point
extent asGMLXML Literal