ABSTRACT
The increasing volume of spatial data available to users emphasizes the importance of spatial data integration. This becomes even more important in the context of spatial decision making, where a fast and effective processing of data is necessary. The quality of integrated data depends on approaches that are used to resolve semantic, geometric, and structural heterogeneities between different sources. For semantic integration, many semantic mapping models were proposed to relate ontologies describing these sources (Noy and Musen, 2001; Maedche and Staab, 2002; Doan et al., 2004; Mostafavi, 2006) or schemas (Do and Rahm, 2001; Madhavan et al., 2001). The motivation of this chapter is the problem of semantic mapping quality, which is a new concept that we will define in this chapter. Semantic mapping quality affects the quality of the integrated data since semantic mappings between ontologies are used to rewrite queries on a first source for another source (Bouquet et al., 2005). For example, a mapping may involve a loss of precision (i.e., the semantic mapping model does not exploit the finest degree of definition of concepts). The
4.1 Introduction ................................................................................................... 37 4.2 Ontology Mapping and Data Quality ............................................................ 38 4.3 A Metamodel for Assessment of Semantic Mapping Quality ...................... 39 4.4 Semantic Mapping Model Enhanced with Elements of Quality ..................40 4.5 Elements of Semantic Mapping Quality ....................................................... 41
4.5.1 Elements of Quality of Input of the Semantic Mapping Model......... 41 4.5.2 Elements of Quality of the Semantic Mapping Model ...................... 42 4.5.3 Elements of Quality of Output of the Semantic Mapping Model ...... 42
4.6 Conclusion and Future Work .........................................................................44 Acknowledgment .....................................................................................................44 References ................................................................................................................44
computed mappings may also be inconsistent with each other. Consequently, the external quality of the integrated data (perceived by users) is affected not only by internal data quality, which depends on each source (Wand and Wang 1996), but also by semantic mapping quality (Figure 4.1).
