Spiros Athanasiou

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1 Motivation Producing and updating geospatial data is expensive and resource intensive. Hence, it becomes crucial to be able to integrate, repurpose and extract added value from geospatial data to support decision making and management of local , national and global resources. Spatial Data Infrastructures (SDIs) and the standardisation efforts from the(More)
An immense wealth of data is already accessible through the Semantic Web and an increasing part of it also has geospatial context or relevance. Although existing technology is mature enough to integrate a variety of information from heterogeneous sources into interlinked features, it still falls behind when it comes to representation and reasoning on(More)
Integrating data from heterogeneous sources has led to the development of Extract-Transform-Load (ETL) systems and methodolo-gies, as a means of addressing modern interoperability challenges. A few such tools have been available for converting between geo-spatial formats, but none specifically addressing the emerging needs of geospatially-enabled RDF(More)
Tracking data has become a valuable resource for establishing speed profiles for road networks, i.e., travel-time maps. While methods to derive travel time maps from GPS tracking data sources, such as floating car data (FCD), are available, the critical aspect in this process is to obtain amounts of data that fully cover all geographic areas of interest. In(More)
Web method-ologies and technologies have strengthened their position in the areas of data and knowledge management. Standards for organizing and querying semantic information, such as RDF(S) and SPARQL are adopted by large academic communities, while corporate vendors adopt semantic technologies to organize, expose, exchange and retrieve their data as(More)
US Landsat and EU Sentinel missions-will shortly-provide massive multitemporal remote sensing data. Therefore, the development of efficient technologies for their direct manipulation and processing is of fundamental importance. Towards this direction, we present a WebGIS system for the online analysis of open remote sensing data and for precision(More)
In this paper, we present FAGI-tr, a tool for aligning RDF vocabularies with respect to their geospatial aspect. The tool provides a framework for (a) loading a source and a target geospatial RDF dataset, (b) identifying vocabularies for representing geospatial RDF data, (c) selecting, from both datasets, the representations to be considered for processing,(More)
Mobile devices are a promising platform for content delivery considering the (i) variety of attached sensors, (ii) widespread availability of wireless networks, (iii) even increasing screen estate and hardware specs. What has been missing so far is the adequate coupling of content to those devices and their users' actions. This is especially apparent in the(More)