2 Search Results for "Voisard, Agnès"

Document
DOI: 10.4230/LIPIcs.GIScience.2025.4
Precomputed Topological Relations for Integrated Geospatial Analysis Across Knowledge Graphs

Authors: Katrina Schweikert, David K. Kedrowski, Shirly Stephen, and Torsten Hahmann

Published in: LIPIcs, Volume 346, 13th International Conference on Geographic Information Science (GIScience 2025)

Abstract
Geospatial Knowledge Graphs (GeoKGs) represent a significant advancement in the integration of AI-driven geographic information, facilitating interoperable and semantically rich geospatial analytics across various domains. This paper explores the use of topologically enriched GeoKGs, built on an explicit representation of S2 Geometry alongside precomputed topological relations, for constructing efficient geospatial analysis workflows within and across knowledge graphs (KGs). Using the SAWGraph knowledge graph as a case study focused on enviromental contamination by PFAS, we demonstrate how this framework supports fundamental GIS operations - such as spatial filtering, proximity analysis, overlay operations and network analysis - in a GeoKG setting while allowing for the easy linking of these operations with one another and with semantic filters. This enables the efficient execution of complex geospatial analyses as semantically-explicit queries and enhances the usability of geospatial data across graphs. Additionally, the framework eliminates the need for explicit support for GeoSPARQL’s topological operations in the utilized graph databases and better integrates spatial knowledge into the overall semantic inference process supported by RDFS and OWL ontologies.
Cite as

Katrina Schweikert, David K. Kedrowski, Shirly Stephen, and Torsten Hahmann. Precomputed Topological Relations for Integrated Geospatial Analysis Across Knowledge Graphs. In 13th International Conference on Geographic Information Science (GIScience 2025). Leibniz International Proceedings in Informatics (LIPIcs), Volume 346, pp. 4:1-4:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

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@InProceedings{schweikert_et_al:LIPIcs.GIScience.2025.4,
  author =	{Schweikert, Katrina and Kedrowski, David K. and Stephen, Shirly and Hahmann, Torsten},
  title =	{{Precomputed Topological Relations for Integrated Geospatial Analysis Across Knowledge Graphs}},
  booktitle =	{13th International Conference on Geographic Information Science (GIScience 2025)},
  pages =	{4:1--4:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-378-2},
  ISSN =	{1868-8969},
  year =	{2025},
  volume =	{346},
  editor =	{Sila-Nowicka, Katarzyna and Moore, Antoni and O'Sullivan, David and Adams, Benjamin and Gahegan, Mark},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.GIScience.2025.4},
  URN =		{urn:nbn:de:0030-drops-238332},
  doi =		{10.4230/LIPIcs.GIScience.2025.4},
  annote =	{Keywords: knowledge graph, GeoKG, spatial analysis, ontology, SPARQL, GeoSPARQL, discrete global grid system, S2 geometry, GeoAI, PFAS}
}
Document
DOI: 10.4230/DagSemProc.07191.7
On the Cost of Shifting Event Processing within Wireless Environments

Authors: Kirsten Terfloth, Katharina Hahn, and Agnès Voisard

Published in: Dagstuhl Seminar Proceedings, Volume 7191, Event Processing (2007)

Abstract
With the emergence of wireless sensor networks, the challenges of event recognition and processing have been partially shifted into the embedded domain. While new processing capabilities on small devices allow for physically close event monitoring and fast filtering, new challenges due to sparse resources or medium contention when relying on wireless communication arise. Within this talk, a short introduction into an experimental setup featuring event-detection on a construction fence is given. The goal has been to distinguish a person climbing over the fence from other events, which it may be exposed to, with the help of a wireless sensor network. The results obtained will be presented thoroughly. Regarding those, we discuss in which situations distributed event recognition and processing is to be preferred over a conventional server-centered deployment. Therefore, the costs such as communication, hardware and deployment related costs implying an architectural decision are examined.
Cite as

Kirsten Terfloth, Katharina Hahn, and Agnès Voisard. On the Cost of Shifting Event Processing within Wireless Environments. In Event Processing. Dagstuhl Seminar Proceedings, Volume 7191, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

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@InProceedings{terfloth_et_al:DagSemProc.07191.7,
  author =	{Terfloth, Kirsten and Hahn, Katharina and Voisard, Agn\`{e}s},
  title =	{{On the Cost of Shifting Event Processing within Wireless Environments}},
  booktitle =	{Event Processing},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7191},
  editor =	{Mani Chandy and Opher Etzion and Rainer von Ammon},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07191.7},
  URN =		{urn:nbn:de:0030-drops-11413},
  doi =		{10.4230/DagSemProc.07191.7},
  annote =	{Keywords: Event processing, embedded devices}
}
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