Multi-Agent Planning for Automatic Geospatial Web Service Composition in Geoportals
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Data and Service Discovery in Linked SDI and Linked VGI
Data and Service Discovery in Linked SDI and Linked VGI Virtual Workshop on Geospatial Semantic Architectures Todd Pehle May 7, 2013 Chief Engineer tpehle-at-orbistechnologies.com 1 Agenda • Introduce Example OGC Workflow • Describe Analogous Linked Data Workflow: • Geographic Feature Types in Linked SDI/VGI • Data Discovery with GeoVoID • Service Capabilities with GeoSPARQL Service Descriptions • SPARQL-based Feature Collections • Conclusion 2 Example OGC-based GIS Workflow 1. Discover OGC Catalog 2. Search Catalog by Feature Type/BBOX 3. Discover OGC WFS Service 4. GetCapabilities 5. GetFeature 6. DescribeFeatureType 7. Add WFS Layer(s) to Map 8. Get Feature By ID 3 Feature Types in LOD What constitutes a feature type in Linked Data? • Linked Data is described using RDFS and OWL ontologies giving data a formal semantics • Consensus on a “core” intensional semantics for geographic phenomena remains elusive • Option 1: Wait (a long time) for consensus • Option 2: Minimize ontological commitment and apply definitions driven by extensional alignment (i.e. – no core) 4 Common LOD Feature Type Definitions W3C Basic Geo (Linked VGI) OGC GeoSPARQL (Linked SDI) ? SpatialThing SpatialObject ? Feature Geometry Point ns:City Relations = rdfs:subClassOf 5 Dataset Discovery with VoID and DCAT • VoID Capabilities: • General metadata • Structural • Class/property partitions • Linksets • DCAT Capabilities: • Interoperability of Catalogs • Non-RDF Catalogs Source: http://docs.ckan.org/en/latest/geospatial.html • Often stored in data portal like CKAN • Offers BBOX dataset queries • Has extension support for CSW • Flexible discovery via centralized catalogs AND socialized links (VoID Repos, URI backlinks, etc.) 6 Geospatial Data Discovery with GeoVoID Goals: • Enable discovery of geographic feature data and services in LOD via: • Feature Type Discovery • Feature Type Spatial Extents • Dataset Spatial Extents • Thematic Attribution Schema Discovery (maybe) • GeoSPARQL Endpoint Discovery • Reuse and extend existing LOD vocabs vs. -
Opengis Web Feature Services for Editing Cadastral Data
OpenGIS Web Feature Services for editing cadastral data Analysis and practical experiences Master of Science thesis T.J. Brentjens Section GIS Technology Geodetic Engineering Faculty of Civil Engineering and Geosciences Delft University of Technology OpenGIS Web Feature Services for editing cadastral data Analysis and practical experiences Master of Science thesis Thijs Brentjens Professor: prof. dr. ir. P.J.M. van Oosterom (Delft University of Technology) Supervisors: drs. M.E. de Vries (Delft University of Technology) drs. C.W. Quak (Delft University of Technology) drs. C. Vijlbrief (Kadaster) Delft, April 2004 Section GIS Technology Geodetic Engineering Faculty of Civil Engineering and Geosciences Delft University of Technology The Netherlands Het Kadaster Apeldoorn The Netherlands i ii Preface Preface This thesis is the result of the efforts I have put in my graduation research project between March 2003 and April 2004. I have performed this research part-time at the section GIS Technology of TU Delft in cooperation with the Kadaster (the Dutch Cadastre), in order to get the Master of Science degree in Geodetic Engineering. Typing the last words for this thesis, I have been realizing more than ever that this thesis marks the end of my time as a student at the TU Delft. However, I also realize that I have been working to this point with joy. Many people are “responsible” for this, but I’d like to mention the people who have contributed most. First of all, there are of course people who were directly involved in the research project. Peter van Oosterom had many critical notes and - maybe even more important - the ideas born out of his enthusiasm improved the entire research. -
A Survey of Geospatial Semantic Web for Cultural Heritage
heritage Review A Survey of Geospatial Semantic Web for Cultural Heritage Ikrom Nishanbaev 1,* , Erik Champion 1 and David A. McMeekin 2 1 School of Media, Creative Arts, and Social Inquiry, Curtin University, Perth, WA 6845, Australia; [email protected] 2 School of Earth and Planetary Sciences, Curtin University, Perth, WA 6845, Australia; [email protected] * Correspondence: [email protected] Received: 23 April 2019; Accepted: 16 May 2019; Published: 20 May 2019 Abstract: The amount of digital cultural heritage data produced by cultural heritage institutions is growing rapidly. Digital cultural heritage repositories have therefore become an efficient and effective way to disseminate and exploit digital cultural heritage data. However, many digital cultural heritage repositories worldwide share technical challenges such as data integration and interoperability among national and regional digital cultural heritage repositories. The result is dispersed and poorly-linked cultured heritage data, backed by non-standardized search interfaces, which thwart users’ attempts to contextualize information from distributed repositories. A recently introduced geospatial semantic web is being adopted by a great many new and existing digital cultural heritage repositories to overcome these challenges. However, no one has yet conducted a conceptual survey of the geospatial semantic web concepts for a cultural heritage audience. A conceptual survey of these concepts pertinent to the cultural heritage field is, therefore, needed. Such a survey equips cultural heritage professionals and practitioners with an overview of all the necessary tools, and free and open source semantic web and geospatial semantic web platforms that can be used to implement geospatial semantic web-based cultural heritage repositories. -
A Pilot for Testing the OGC Web Services Integration of Water-Related Information and Models
RiBaSE: A Pilot for Testing the OGC Web Services Integration of Water-related Information and Models Lluís Pesquer Mayos, Simon Jirka, Grumets Research Group CREAF 52°North Initiative for Geospatial Open Source Software Edicifi C, Universitat Autònoma de Barcelona GmbH 08193 Bellaterra, Spain 48155 Münster, Germany [email protected] [email protected] Christoph Stasch, Joan Masó Pau, Grumets Research Group CREAF 52°North Initiative for Geospatial Open Source Software Edicifi C, Universitat Autònoma de Barcelona GmbH Bellaterra, Spain 48155 Münster, Germany [email protected] [email protected] David Arctur, Center for Research in Water Resources, University of Texas at Austin 10100 Burnet Rd Bldg 119, Austin, TX USA [email protected] Abstract—The design of an interoperability experiment to The OGC is an international industry consortium of demonstrate how current ICT-based tools and water data can companies, government agencies and universities participating work in combination with geospatial web services is presented. in a consensus process to develop publicly available interface This solution is being tested in three transboundary river basins: standards. Some successful examples of OGC standards for Scheldt, Maritsa and Severn. The purpose of this experiment is to general spatial purposes are, for example, the Web Map assess the effectiveness of OGC standards for describing status Service (WMS) for providing interoperable pictorial maps and dynamics of surface water in river basins, to demonstrate over the web and the Keyhole Markup Language (KML) as a their applicability and finally to increase awareness of emerging data format for virtual globes. On the other hand, hydrological standards as WaterML 2.0. -