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Best paper award: Konstantin Clemens

We congratulate our team member Mr. Konstantin Clemens for receiving the "Best Paper" Award at The Seventh International Conference on Advanced Geographic Information Systems, Applications, and Services, that took place on February 22 - 27 in Lisbon, Portugal: GEOProcessing 2015 Awards.

Geocoding with OpenStreetMap Data


OpenStreetMap (OSM) is a platform where users contribute geographic data. To serve multiple use cases, these data are held in a very generic format. This makes processing and indexing OSM data a challenge. Nominatim is an open source search and geocoding engine that consumes OSM data. While Nominatim does process OSM data well, it does not use term frequency – inversed document frequency (TF/IDF) based ranking of search results. Lucene is a framework offering TF/IDF for ranking of indexed documents. In this paper Nominatim’s processing of OSM data is utilized to assemble full addresses with their geocoordinates. These addresses are then indexed in Elasticsearch, a web service on top of Lucene. The resulting TF/IDF based geocoding system is benchmarked in comparison with plain Nominatim. The analysis shows: TF/IDF based ranking yields more accurate results, especially for queries with unordered address elements or only partially specified addresses.

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