A number of accessible RDF stores are populating the linked open data world. The navigation on data reticular relationships is becoming every day more relevant. Several knowledge base repositories present relevant links to common vocabularies while many others are going to be discovered increasing the reasoning capabilities of our knowledge base applications. Linked Open Graph, LOG, is a web tool for collaborative browsing and navigation on multiple SPARQL entry points, RDF stores and LD in integrated manner. The LOG.disit.org tool is shortening the gap from the users to understand the Linked Data and provides an easy and accessible set of samples to navigate in multiple RDF stores with LD/LOD: providing features and advantages using dbPedia, Getty, Europeana, Geonames, etc. The LOG tool is free to be used, and to be embedded in third party pages. It has been adopted, developed and/or improved in multiple projects: such as ECLAP for social media cultural heritage, Sii-Mobility for smart city, and ICARO for cloud ontology analysis, OSIM for competence / knowledge mining and analysis.
The LOG.DISIT.ORG is covering multiple domains: cultural heritage, library, smart city, smart cloud, e-govern, etc. It allows discovering links, saving and sharing the graphs among a community.
A very large number of public and private data sets are available from local governments and are a huge resources for Europe and for the cities. In most cases, the citizens use worldwide operators such as Google, OpenStreet Map, Here, TomTom, etc., to get information while they found it in most cases insufficient for who is leaving in the city. The local governs have much more detailed data, some of them are public other are private and accessible only as authenticated services and thus not easily accessible for worldwide operators. These open and private valuable data are too fragmented and not accessible for the final users, citizens or companies that use to exploit them for providing services. They could be a source of revenues and are becoming a big business for local specific services, too small and complex to be of interest for worldwide operators.
In order to solve the above described problems and provide a unique point of access for interoperable data of a city metropolitan area we have realized (http://www.disit.org/km4city ) an ontological model called Km4City and well formalized and open grounded on ontology standards. In addition, a set of tools for data ingestion, management, aggregation, indexing and for producing in short time web and mobile applications have been realized and make accessible. The solution is presently today in place in Florence and whole Tuscany area. A smarter navigation can be performed from http://servemap.disit.org while mobile applications are accessible on Google Play and Apple Store.
The Km4City solution is covering multiple domains for citizens integrating aspects of mobility and transport, with energy, banks, parking, commercial, bike paths, delay for busses, garden areas, etc.
This work was done as a part of MSc thesis research.