GeoSpatial Semantics: 4th International Conference, GeoS by Massimo Craglia, Stefano Nativi, Mattia Santoro, Lorenzino

By Massimo Craglia, Stefano Nativi, Mattia Santoro, Lorenzino Vaccari, Cristiano Fugazza (auth.), Christophe Claramunt, Sergei Levashkin, Michela Bertolotto (eds.)

This e-book constitutes the refereed lawsuits of the 4th overseas convention on GeoSpatial Semantics, GeoS 2011, held in Brest, France, in could 2011.
The thirteen papers provided including 1 invited speak have been conscientiously reviewed and chosen from 23 submissions. The papers specialise in formal and semantic techniques, time and activity-based styles, ontologies, in addition to caliber, conflicts and semantic integration. they're geared up in topical sections on ontologies and gazetteers, activity-based and temporal matters, types, caliber and semantic similarities, and retrieval and discovery methods.

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Additional info for GeoSpatial Semantics: 4th International Conference, GeoS 2011, Brest, France, May 12-13, 2011. Proceedings

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The work was carried out at Dep. Computer Science, Univ. of Pisa, 56100, Pisa, IT. The work was carried out at LBD Lab EPFL, EPFL-IC-LBD, CH-1015 Lausanne, CH. C. Claramunt, S. Levashkin, and M. ): GeoS 2011, LNCS 6631, pp. 16–33, 2011. © Springer-Verlag Berlin Heidelberg 2011 Improving Geodatabase Semantic Querying Exploiting Ontologies 17 In the last decade, ontologies have gained increasing interest in the GIS community [Mark06, Fonseca02, Spaccapietra04], because they can be used to create and exploit data standards as well as human computer interfaces and to solve heterogeneity/ interoperation problems.

We can define formally this process as follows. Given a domain Generic Ontology OG=(CG,RG,relG,HG,AG), the DBOntology ODB =(CDB,RDB,relDB,HDB,ADB) is defined as follows: 24 M. Baglioni et al. c∈Conc(a) ∧ ∀c’’∈Conc(a). H(c,c’)}, o h-1:C→C. h-1(c)=c’ ⇔ H(c’,c) ADB = {a∈ADO|∀c∈Conc(a). r∈SpatialRelation} where o ADO is the set of axioms in Onto o Conc(a)={c∈C| a∈A, c∈a} is the set of concepts that define the axiom a o relations(a)={r ∈R| a∈A, r∈a} is the set of relations that define the axiom a o SpatialRelation is the set of the considered spatial relation RDB = RG RelDB = relG HDB = HG U {(c,c’)|c∈CG∧c’∈CDB∧h-1(c’)=c} For each new concept added to the DBOntology, a materialized view representing the SQL query correspondent to the axiom defining the concept is added to the database.

The first phase consists in (1) selecting all the domain ontology concepts with a direct mapping to database tables, and (2) selecting all the concepts in the domain ontology that are siblings or children of the concepts found at point 1). We call the resulting ontology the DBOntology at step zero (DBO_0). The leaves of this ontology are the concepts mapped directly to database tables. The second phase consists in expanding, as much as possible, the DBO_0 with the input domain ontology concepts defined by axioms, following the rules presented in previous section.

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