Ordnance Survey & Ontologies

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