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I am a hard bloggin' scientist. Read the Manifesto.

Plugin fixed

A new version of the SimCat Protégé-Plugin is available at SourceForge.
The current version reacts properly on server errors and also displays DIG-specific error messages.

Out of Office

The SimCat team was literally thrown out of office yesterday because the university had measured a high concentration of PCBs in our building the night before. The whole building complex has been evacuated, and it is not clear yet how long we will have to work in “exile”. For the time being, we will have to manage working at home and meeting at local cafés (which is not too bad, actually).

But there is also good news: our submission to GeoS 2007 has been accepted! We will add a publications section to this website soon, where you can have a look at what we are publishing at SimCat.

SIM-DL server alpha2 released

Today the second alpha of our SIM-DL similarity server was released. It can be downloaded from the sourceforge repository: SIM-DL

Second alpha: SimCat plugin

The second alpha release of the SimCat plugin for Protege is ready for download.

This release contains following functions:
- explore OWL ontologies
- specify search concept & context
- DIG interface for accessing SimDL services
- reasoner monitoring
- visualization of similarity measurement results

We proudly present…

SimCat Whiteboard…the SimCat whiteboard! Not sure if anyone of us will still understand this mess next week…

Ontology Engineering

The first whiteboard draft for the light version of our feature type ontology.

First Alpha: Poochie

Our first alpha release Poochie is ready for download!

To have the wohle project in one place at SourceForge, we have also moved our blog to You should be forwarded from the old URL, the URL for the RSS feed remained unchanged. If there should be any problems, please let us know in the comments.

Similarity Workshop

Workshop on Semantic Similarity Measurement and Geospatial Applications

in Melbourne, Australia, September 19th, 2007

Held in conjunction with COSIT 2007,
the International Conference on Spatial Information Theory


Krzystof Janowicz, Institute for Geoinformatics, University of Muenster
Angela Schwering, Institute of Cognitive Science, University of Osnabrueck
Martin Raubal, Department of Geography, University of California at Santa Barbara
Werner Kuhn, Institute for Geoinformatics, University of Muenster

Workshop Theme

Semantic similarity measurement is central for enabling semantic interoperability between geographic information systems and web-services and compability between data-sources. Similarity and similarity-based reasoning has become more and more important for the functioning of many geo-spatial tasks such as

  • spatial planning and decision support in emergency management
  • retrieval and integration of spatial information across organizational borders
  • acquisition, organization and utilization of knowledge about the spatial environment and human-machine communication in navigation tasks of humans as well as robots.

Similarity-based information processing is more flexible than binary match algorithms and less rigid than classical reasoning. This workshop tackles problems regarding the representation of geo-spatial semantics, the application of similarity measures as indicator for the degree of interoperability, and the use of similarity measurement in geo-spatial applications. The workshop will address issues such as

  • existing similarity measures and their combination / hybrid approaches
  • similarity measurement in different applications (such as Location-Based Services)
  • similarity in concept formation and categorization
  • similarity measurement at the instance level
  • what do similarity measures really measure?
  • role of similarity / similarity-based reasoning in the future
  • types of similarity (mere appearance, analogy …)
  • fuzzyness and vagueness in similarity measurement
  • cognitive adequacy of similarity measurement / human strategies of similarity perception and similarity judgment
  • similarity and time

Call for Papers

Anybody with an interest in the questions raised above is invited to submit a position paper as basis for discussions during the workshop. Extended abstracts of 1000 - 1500 words should be sent by email to janowicz[at] Accepted papers will be made available on the workshop web site, unless their authors instruct us otherwise. Authors will be notified whether their position papers have been selected for an additional short-presentation during the workshop. Authors are invited to submit revised versions of their position papers to a post-workshop review process, leading to a journal special issue on future research directions for semantic similarity research.

Important Dates

Submission: 8th June 2007
Notification: 20th June 2007
Workshop:   19th September 2007


SimCat vs. Protégé

We have started do develop a Protégé Plugin for accessing the SimCat Similarity Server. More about the plugin soon!

Similarity Server Progress


Our similarity server now runs on Jetty 6! The picture shows Martin at our reasoning team’s last coding session with two video projectors.