University of Leipzig AKSW Homepage | Blog |

Archiv für die Kategorie 'Linked Geo Data'

AKSW at TU Dresden PLT

June 17, 2011 - 3:34 pm by Jens Lehmann - One comment »

On June 8, I (Jens) visited the process control engineering research group (PLT) of Leon Urbas at the Dresden University of Technology. We first met on the Leipziger Semantic Web Day where Leon Urbas presented interactive Linked Data applications and decided to have a longer meeting later on. I first gave a talk on the Linked Data Lifecycle (slides as PDF), which is a central element of the vision behind the LOD2 project – a cycle of mutual refinement which can help to overcome some of the problems in using Linked Data. It extends on an earlier vision description by Sören and me.

After the initial presentation, we exchanged ideas for collaboration between our groups. The PLT group has a very strong record in large scale practical applications, mobile devices and usability testing. Since their background is automation engineering, they view semantic technologies as a way to connect large networks of knowledge in a flexible manner. They were particularly interested in some of our research and software tools like LIMES, SAIM and OntoWiki. I enjoyed staying at the group and I am looking forward to further meetings.

LinkedGeoData Release 2

April 27, 2011 - 6:32 pm by ThomasRiechert - 3 comments »
The AKSW research group is happy to announce a new release of LinkedGeoData!

The aim of the LinkedGeoData (LGD) project is to make the OpenStreetMap (OSM) datasets easily available as RDF. As such the main target audience is the Semantic Web community, however it may turn out to be useful to a much larger audience. Additionally, we are providing interlinking with DBpedia and GeoNames and integration of class labels from translatewiki and icons from the Brian Quinion Icon Collection.

The result is a rich, open, and integrated dataset which we hope to be useful for research and application development. The datasets can be publicly accessed via downloads, Linked Data, and SPARQL-endpoints. We have also launched an experimental “Live-SPARQL-endpoint” that is synchronized with the minutely updates from OSM whereas the changes to our store are republished as RDF.

The improvements over the somewhat aged previous release in the middle of 2009 can be summarized as:

  • Better data quality thanks to a more flexible mapping system.
  • Spatial query support as supported by OpenLink’s Virtuoso enterprise edition.
  • Two Sparql-endpoints: one containing the data of the most recent LGD release,
  • and one experimental one synchronzied with OpenStreetMap.org!
  • More interlinking
  • Improvements on the LGD-Browser (however this is work in progress)

We would like to thank the whole AKSW group and OpenLink for their support in making this release possible. Furthermore this work is acknowledged by the European Union within the LOD2 project.

Example Links:

Sparql-Queries: See http://linkedgeodata.org/OnlineAccess/SparqlEndpoints
Live-Sync-Status page (work in progress): http://live.linkedgeodata.org/status
Ontology: http://linkedgeodata.org/ontology/
LGD-Browser: http://browser.linkedgeodata.org/
Linked Data Example: http://linkedgeodata.org/triplify/node264695865
Published Changesets: http://downloads.linkedgeodata.org/releases/110406/changesets/
based on: http://planet.openstreetmap.org/minute-replicate/

May 4-5: Leipziger Semantic Web Tag 2011 and Local Media Conferenz

April 16, 2011 - 5:39 pm by Sören Auer - No comments »

Like in the past two years, we again organize a Leipzig Semantic Web Day on May 5th at the marvelous Mediencampus Villa Ida. This year’s theme is “Linked Data  for the Masses”, particularly focusing on its use in enterprises. This event will not only give you the opportunity to discuss current developments around semantic web technologies, but also to get in touch with companies from the German-speaking world. LSWT2011 will have two distinguished keynote speakers: Martin Hepp will share his vision and recent developments around the GoodRelations ecommerce vocabulary with us. The second keynoter Andreas Blumauer from the Semantic Web Company in Vienna will show us how Linked Data can facilitate clean energy.

On the pre-conference day May 4th we will have two tutorials  – an introduction to the Semantic Data Web and another one on the GoodRelations ecommerce vocabulary. Also, on May 4th SoLoMo the Local Media Conference takes place at the Mediencampus, discussing developments around Groupon, Foursquare, Qype, MyHeimat and other local-oriented media.

You can find more information about LSWT at: http://aksw.org/LSWT.

We thank the following LSWT sponsors for their support:




Semantic Web Journal launched

April 25, 2010 - 12:11 am by Sören Auer - One comment »

A short while ago the Semantic Web Journal was launched. Pascal Hitzler and Krzysztof Janowicz are editors-in-chief and AKSW’s Sören Auer serves on the editorial board. The journal published by IOS Press differs from other journals, in particular, since it follows an open and transparent peer-review process, which engages a wider community besides expert reviews. Supported by its young and agile editorial board, the SWJ can be expected to bring a lot of fresh wind to an already aging Semantic Web community. Since SWJ just started, it is right now a perfect time to submit an article to SWJ or propose a special issue. Please check out: http://www.semantic-web-journal.net.

Dedicated Virtual LinkedGeoData Server

April 15, 2010 - 12:29 pm by Jens Lehmann - No comments »

Due to the rising interest in our LinkedGeoData project and the growth of the underlying OpenStreetMap database, we expanded the AKSW server infrastructure. LinkedGeoData will gradually move to a new server running Debian within the next weeks. This server runs on a virtual machine inside a new cluster at the University of Leipzig. Resources (memory, CPU, hard disk) can be allocated dynamically (of course limited by financial restrictions) such that we hope to keep up with the growth of the project. The first LinkedGeoData applications to move on the new server will be the Linked Data interface and the LGD Browser.