Abstract
After the mobile revolution, geographical knowledge has getting more and more importance in many location-aware application scenarios. Its popularity influenced also the production and publication of dedicated datasets in the Linked Data (LD) cloud. In fact, its most recent representation shows Geonames competing with DBpedia as the largest and most linked knowledge graph available in the Web. Among the various projects related to the collection and publication of geographical information, as of today, Open Street Map (OSM) is for sure one of the most complete and mature one exposing a huge amount of data which is continually updated in a crowdsourced fashion. In order to make all this knowledge available as Linked Data, we developed LOSM: a SPARQL endpoint able to query the data available in OSM by an on-line translation form syntax to a sequence of calls to the OSM overpass API. The endpoint makes also possible an on-the-fly integration among Open Street Map information and the one contained in external knowledge graphs such as DBpedia, Freebase or Wikidata.
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Details on the implemented subset is available at http://sisinflab.poliba.it/semanticweb/lod/losm/losm_grammar.html.
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[units] can be meters (‘m’ or ‘M’), kilometers (‘km’ or ‘KM’) or miles (‘mi’ or ‘MI’).
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The reader can find a real example of such scenario in [17] where it is described the Haiti-post-earthquake work done on Open Street Map: volunteers rapidly mapped the affected areas so helping the aid effort. They show the impact of a crowdsourced mapping in such emergency situation. Moreover, Open Street Map has an humanitarian team to deal with emergency situations. They keep updated a page with current and past remote mapping actions (see http://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Team).
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It is noteworthy the use of the spatial function spatial:nearby, the LOSM predicate losm:refugee and the geo functions geo:lat and geo:long.
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Note that the returned name is a Japanese name.
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The authors acknowledge partial support of PON03PE_00136_1 Digital Services Ecosystem: DSE and Progetto Corvallis.
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Anelli, V.W., Calì, A., Di Noia, T., Palmonari, M., Ragone, A. (2016). Exposing Open Street Map in the Linked Data Cloud. In: Fujita, H., Ali, M., Selamat, A., Sasaki, J., Kurematsu, M. (eds) Trends in Applied Knowledge-Based Systems and Data Science. IEA/AIE 2016. Lecture Notes in Computer Science(), vol 9799. Springer, Cham. https://doi.org/10.1007/978-3-319-42007-3_29
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