OSMonto - An Ontology of OpenStreetMap Tags Mihai Codescu*, Gregor Horsinka*, Oliver Kutz** Till Mossakowski* , **, Rafaela Rau* * DFKI GmbH Bremen, Germany ** Research Center on Spatial Cognition, SFB/TR 8, University of Bremen, Germany Abstract. We provide an ontology for OpenStreetMap tags, called OSMonto, which can be used in different ways: (1) browsing of the hierarchy of tags is eased, (2) tags can be related with other ontologies, let it be tool-specific ontologies or more general ontologies like the recent Schema.org ontology supported by the dominant search engines, and (3) concepts can be unified, even if they are tagged in various ways. This will foster the integration of OpenStreetMap into the semantic web. Keywords. OpenStreetMap tags, ontologies, Semantic Web 1. Introduction and Motivation OpenStreetMap has evolved into a rich source of geodata. When searching and navigating through a map portal like www.openstreetmap.org, semant- ic metadata can greatly help with providing an intention and activity-based access to the data. In the case of OpenStreetMap, the metadata is provided in the form of tags that are entered into the database in a Social Web and wiki-like manner. Metadata obtained through such Social Web, collaborat- ive and community based efforts have specific characteristics, namely they evolve in a bottom-up way, contain a lot of noise (typos, redundancies, etc.) and are subject to constant change. Currently, OpenStreetMap’s tags are organised and maintained through a collection of Wiki pages 1 that list the popular tags and specify their intended 1 See http://wiki.openstreetmap.org/wiki/Tags and http://wiki.openstreetmap.org/wiki/Features