Abstract
Geoportals are established to function as main gateways to find, evaluate, and start “using” geographic information. Still, current geoportal implementations face problems in optimizing the discovery process due to semantic heterogeneity issues, which leads to low recall and low precision in performing text-based searches. Therefore, we propose an enhanced semantic discovery approach that supports multilingualism and information domain context. Thus, we present workflow that enriches existing structured metadata with synonyms, toponyms, and translated terms derived from user-defined keywords based on multilingual thesauri and ontologies. To make the results easier and understandable, we also provide automated translation capabilities for the resource metadata to support the user in conceiving the thematic content of the descriptive metadata, even if it has been documented using a language the user is not familiar with. In addition, to text-enable spatial filtering capabilities, we add additional location name keywords to metadata sets. These are based on the existing bounding box and shall tweak discovery scores when performing single text line queries. In order to improve the user’s search experience, we tailor faceted search strategies presenting an enhanced query interface for geo-metadata discovery that are transparently leveraging the underlying thesauri and ontologies.
Highlights
Geoportals have been well established as main entrance points to geographic information
We propose to minimize and overcome semantic heterogeneity challenges by providing solutions for cross-language information retrieval techniques combined with ontologies and thesauri
In order to make resources discoverable, we introduced the concepts of geo-enrichment and semantic enhancement of metadata sets
Summary
Geoportals have been well established as main entrance points to geographic information They act as broker between spatial data providers and users. If datasets are documented in a standard-based manner, its metadata is usually stored in catalogue components of geoportals. Their interfaces currently lack efficient discovery mechanisms. To overcome the first issue, efforts must be raised to communicate the advantages of sharing information to both resource providers as well as consumers This is an organizational, not a technical, issue and, has to be considered the most time-consuming process when establishing an SDI portal as people must be convinced of the advantages of user and resource provider collaboration [1]
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