Krzysztof Janowicz

Meme-Broadcast

A Transparent Semantic Enablement Layer for the Geospatial Web

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We just finished a substantially extended and rewritten version of the poster accepted for EuroSSC 2009 (update: the paper was accepted, see below):

Abstract Building on abstract reference models, the Open Geospatial Consortium (OGC) has established standards for storing, discovering, and processing geographical information. These standards act as basis for the implementation of specific services and Spatial Data Infrastructures (SDI). Research on geo-semantics plays an increasing role to support complex queries and retrieval across heterogeneous information sources, as well as for service orchestration, semantic translation, and on-the-fly integration. So fa r, this research targets individual solutions or focuses on the Semantic Web, leaving the integration into SDI aside. What is missing is a shared and transparent semantic enablement layer for Spatial Data Infrastructures which also integrates reasoning services known from the Semantic Web. Focusing on Sensor Web Enablement (SWE) we outline how Spatial Data Infrastructures in general can benefit from such a semantic enablement layer. Instead of developing new semantically enabled services from scratch, we propose to create profiles of existing services that implement a transparent mapping between the OGC and the Semantic Web world.

Janowicz, K. Schade, S., Bröring, A., Keßler, C., and Stasch, C. (2009; forthcomming): A Transparent Semantic Enablement Layer for the Geospatial Web. Terra Cognita 2009 Workshop In conjunction with the 8th International Semantic Web Conference (ISWC 2009), October 26, 2009.

Towards Semantic Enablement for Spatial Data Infrastructures

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A short paper that we have submitted today as part of the 52° North semantics community (update: it has been accepted for the EuroSSC 2009).

Abstract Based on abstract reference models, the Open Geospatial Consortium (OGC) has established standards for the storage, retrieval, and processing of geographical information. These standards act as groundwork for the implementation of concrete services and Spatial Data Infrastructures (SDI). Research on geo-semantics plays an increasing role to support complex queries and discovery across heterogeneous information sources, as well as for on-the-fly integration and semantic translation. So far, existing approaches only target individual solutions or focus on the Semantic Web, leaving the integration into SDI aside. What is missing is a common semantic enablement layer on top of spatial data infrastructures which also integrates reasoning services from the semantic web. Focusing on Sensor Web Enablement (SWE) we outline how spatial data infrastructures can benefit from such semantic enablement layer.

Krzysztof Janowicz, Carsten Keßler, Arne Bröring, and Christoph Stasch. Towards Semantic Enablement for Spatial Data Infrastructures

An Agenda for the Next Generation Gazetteer: Geographic Information Contribution & Retrieval

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We finally managed to write down our vision for the next generation of gazetteers, the work that has already been done in this area, and point to the missing pieces to make this vision come true. attached is a link to our draft, I will replace it if the paper gets accepted (update: the paper has been accepted, see below).

Abstract: Gazetteers are key components of georeferenced information systems, including  applications such as Web-based mapping services. Existing gazetteers lack the capabilities to fully integrate user-contributed and vernacular geographic information, as well as to support complex queries. To address these issues, a next generation gazetteer should leverage formal semantics, harvesting of implicit geographic information — such as geotagged photos — as well as models of trust for contributors. In this paper, we discuss these requirements in detail. We elucidate how existing standards can be integrated to realize a gazetteer infrastructure allowing for bottom-up contribution as well as information exchange between different gazetteers. We show how to ensure the quality of user-contributed information and demonstrate how to improve querying and navigation using semantics-based information retrieval.

Kessler, C., Janowicz, K., and Bishr, M. (2009; forthcoming): An Agenda For The Next Generation Gazetteer: Geographic Information Contribution and Retrieval. In International Conference on Advances in Geographic Information Systems 2009 (ACM SIGSPATIAL GIS 2009)

Reference Systems for Geographic Information: Gazetteer Slides

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Attached are the slides for the Gazetteer class on June 29th 2009 as part of the Reference Systems for Geographic Information course. The slides introduce the basic idea behind gazetteers and discuss various existing and forthcoming gazetteers as well as the vision of a inked data infrastructure for place names.

Semantic Enablement Community at 52° North

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In May 2009 we started a semantics community at 52°North. The community focuses on providing a semantic enablement layer (calles SEL) for services developed within other 52°North communities (and OGC in general) to support semantics-based information retrieval, discovery and querying, on-the-fly integration, semantic translation, as well as further reasoning services. You can finde the website at http://52north.org/semantics and the wiki at https://52north.org/twiki/bin/view/Semantics/WebHome. We have just started to do some papers and prototypes but there is more to come…..

SIM-DL_A: A Novel Semantic Similarity Measure for Description Logics Reducing Inter-Concept to Inter-Instance Similarity

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Abstract. While semantic similarity plays a crucial role for human categorization and reasoning, computational similarity measures have also been applied to fields such as semantics-based information retrieval or ontology engineering. Several measures have been developed to compare concepts specified in various description logics. In most cases, these measures are either structural or require a populated ontology. Structural measures fail with an increasing expressivity of the used description logic, while several ontologies, e.g., geographic feature type ontologies, are not populated at all. In this paper, we present an approach to reduce inter-concept to inter-instance similarity and thereby avoid the canonization problem of structural measures. The novel approach, called SIM-DL_A, reuses existing similarity functions such as co-occurrence or network measures from our previous SIM-DL measure. The required instances for comparison are derived from the completion tree of a slightly modified DL-tableau algorithm as used for satisfiability checking. Instead of trying to find one (clash-free) model, the new algorithm generates a set of proxy individuals used for comparison. The paper presents the algorithm, alignment matrix, and similarity functions as well as a detailed example.

Janowicz, K. and Wilkes, M. (2009; forthcoming): SIM-DL_A: A Novel Semantic Similarity Measure for Description Logics Reducing Inter-Concept to Inter-Instance Similarity. The 6th Annual European Semantic Web Conference (ESWC2009). Lecture Notes in Computer Science 5554, Springer. pp. 353-367, 2009.

Third International Conference on Geospatial Semantics

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CALL FOR PAPERS

Third International Conference on Geospatial Semantics (GeoS 2009)

www.geosco.org

Purpose and Scope

Geospatial semantics is an emerging research theme in the domain of geographic information systems and spatial databases. The previous editions of the conference – GeoS 2005 and GeoS 2007 in late November (Mexico City, Mexico) www.geosco.org were highly successful. We have received about 100 submissions, from which 30 regular and 8 short articles have been published in Volume 3799 and Volume 4853 of the Lecture Notes in Computer Science respectively. People from 28 countries and 5 continents have attended the GeoS conferences.

The third edition GeoS 2009 www.geosco.org aims at providing a forum for the exchange of state-of-the-art research results in the areas of modeling and processing of geospatial semantics. Geospatial semantics play an important role for next-generation spatial databases and geographic information systems, as well as specialized geospatial web services. This conference traditionally brings together researchers whose expertise will address issues such as:

* Theories for geospatial semantic information
* Formal representations of geospatial data
* Models and languages for geoontologies
* Alignment and integration of geoontologies
* Integration of semantics into spatial query processing
* Spatial information retrieval
* Ontology-driven GIS
* Geospatial Semantic Web
* Multicultural aspects of spatial knowledge
* Cognitive aspects of geospatial semantics
* Measuring semantic similarity between spatial datasets
* Representing context for geospatial semantic information
* Semantic Sensor Web
* Ontology-based visualization of geospatial data
* Conceptual models of dynamic geospatial environments
* Personalization of geospatial semantic services

Paper Submissions

Authors are invited to submit full papers of approx. 18 single-spaced pages, in English, formatted in Springer’s Lecture Notes in Computer Science style (www.springer.de/comp/lncs/authors.html). Papers, formatted in PDF, must be submitted through the conference web site (www.geosco.org). At least three members of the Program Committee will evaluate each paper based on scientific significance, relevance to the conference, novelty, relation to previously published literature, and clarity of presentation. The GeoS 2009 proceedings will be published as a volume in Springer’s LNCS series.

Keynotes

* Pascal Hitzler: Semantic Web – Past, Present, and Future

* 2nd Keynote to be announced

Tutorials

* Building a Web of Sensors; 52°North (Arne Bröring and Christoph Stasch)

* OWL 2 Rules; Pascal Hitzler, Markus Krötzsch and Sebastian Rudolph

Venue

GeoS 2009 will be held at the Centro de Investigacion en Computacion (CIC) in Mexico City (www.cic.ipn.mx). The conference site has a spectacular view of the Popocatepetl volcano, which will be snow-covered at the beginning of December. Early December is the best time of the year for traveling to Mexico City with typically clear weather, moderate temperatures, and a deep blue sky.

Important Dates

Papers submission: July 31, 2009
Notification of acceptance: September 4, 2009
Submission of camera-ready papers: September 14, 2009
Registration: October 30, 2009 (early birds – October 15, 2009)
Workshops: December 1 and 2, 2009
Conference: December 3 and 4, 2009

General Chair

Sergei Levashkin, Centro de Investigación en Computación, Mexico City, Mexico

Program Co-Chairs

Krzysztof Janowicz, GeoVISTA Center, Department of Geography at Penn State, USA
Martin Raubal, University of California, Santa Barbara, USA

Local Organizing Comitee
PIIG-Lab, Centro de Investigación en Computación, Mexico City, Mexico

Miguel Martinez (chair)
Nahun Montoya
Walter Renteria
Iyeliz Reyes
Gerardo Sarabia
Linaloe Sarmiento
Roberto Zagal

Program Committee

Neeharika Adabala, Microsoft Research, India
Pragya Agarwal, University College London, UK
Ola Ahlqvist, Ohio State University, USA
Naveen Ashish, UC-Irvine, Irvine CA, USA
Ioan Marius Bilasco, Laboratoire d’Informatique Fondamentale de Lille (LIFL), France
Stefano Borgo, Laboratory for Applied Ontology, Italy
Brandon Bennett, University of Leeds, UK
Tom Bittner, University at Buffalo, USA
Boyan Brodaric, Geological Survey of Canada, Canada
Gilberto Camara, INPE, Brazil
Isabel F. Cruz, University of Illinois at Chicago, USA
Clodoveu Davis Jr., Universidade Federal de Minas Gerais, Brazil
Andrew U. Frank, Technical University Vienna, Austria
Christian Freksa, University of Bremen, Germany
Mark N. Gahegan, University of Auckland, New Zealand
Cory Andrew Henson, Wright State University, USA
Stephen Hirtle, University of Pittsburg, USA
Pascal Hitzler, University of Karlsruhe, Germany
Jerry Hobbs, ISI, USA
Prateek Jain, Wright State University, USA
Christopher B. Jones, Cardiff University, UK
Marinos Kavouras, National Technical University of Athens, Greece
Carsten Keßler, University of Münster, Germany
Alex Klippel, The Pennsylvania State University, USA
Craig Knoblock, University of Southern California, USA
Margarita Kokla, National Technical University of Athens, Greece
Dave Kolas, BBN Technologies, USA
Werner Kuhn, University of Muenster, Germany
Michael Lutz, Institute for Environment and Sustainability, Italy
Miguel Felix Mata Rivera, Instituto Politecnico Nacional, Mexico
Marco Painho, University of Lisbon, Portugal
Christine Parent, University of Lausanne, Switzerland
Vasily Popovich, Saint Petersburg Institute for Informatics and Automation, RAS, Russia
Sudha Ram, University of Arizona, USA
Andrea Rodriguez, Universidad de Concepcion, Chile
Christoph Schlieder, University of Bamberg, Germany
Angela Schwering, University of Muenster, Germany
Shashi Shekhar, University of Minnesota, USA
Kathleen Stewart Hornsby, University of Iowa, USA
Nancy Wiegand, University of Wisconsin-Madison, USA
Stephan Winter, University of Melbourne, Australia
Michael F. Worboys, University of Maine, USA

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