This study focuses on the information content of the geospatial databases used to guide pedestrians as well as those with disabilities. In this paper we introduce an information model for describing this content. The model covers the physical environment faced by a person moving on foot. We have used the Unified Modeling Language class diagrams to formalize the information model on a conceptual level. The features are divided into two abstract top-level classes: one allowing pedestrian access and the other hindering it. A consistent and comprehensive pedestrian network is at the core of the model. The model also covers other geographical information to increase accessibility. The aim of the created information model is to help data providers to collect and store appropriate data using the appropriate methods.

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ABSTRACT:In this study, a prototype service to provide data from Web Feature Service (WFS) as linked data is implemented. At first, persistent and unique Uniform Resource Identifiers (URI) are created to all spatial objects in the dataset. The objects are available from those URIs in Resource Description Framework (RDF) data format. Next, a Web Ontology Language (OWL) ontology is created to describe the dataset information content using the Open Geospatial Consortium's (OGC) GeoSPARQL vocabulary. The existing data model is modified in order to take into account the linked data principles. The implemented service produces an HTTP response dynamically. The data for the response is first fetched from existing WFS. Then the Geographic Markup Language (GML) format output of the WFS is transformed on-the-fly to the RDF format. Content Negotiation is used to serve the data in different RDF serialization formats. This solution facilitates the use of a dataset in different applications without replicating the whole dataset. In addition, individual spatial objects in the dataset can be referred with URIs. Furthermore, the needed information content of the objects can be easily extracted from the RDF serializations available from those URIs.A solution for linking data objects to the dataset URI is also introduced by using the Vocabulary of Interlinked Datasets (VoID). The dataset is divided to the subsets and each subset is given its persistent and unique URI. This enables the whole dataset to be explored with a web browser and all individual objects to be indexed by search engines.