• VideoCLEF 2010
  • Tagging Task Pro
  • Tagging Task WWW
  • Placing Task
  • Affect Task
  • Passage Task
  • Linking Task
• VideoCLEF 2009
• VideoCLEF 2008
• Why Participate?
• FAQs
• About us
• Acknowledgments

The Placing Task

Geotagging, or assigning geographical coordinates to shared content, has recently become an overwhelmingly popular activity on the Web. Currently, there are over 130 million images on Flickr alone (October 2009) that are manually or automatically (via GPS devices) placed on the World map. At the same time, recent developments at leading video content sharing web-sites have motivated their users to start geotag their videos as well. So, it is already possible to browse thousands of Youtube or Flickr videos, just by traversing the map. Check out the following links:

YouTube videos on the map of Paris
Flickr videos on the World Map

Task
Participants will try to automatically guess the location of the video, i.e., assign geo-coordinates (latitude and longitude) to videos using one or more of: video metadata (tags, titles), visual content, audio content, social information. Any use of open resources, such as gazetteers, or geo-tagged articles in Wikipedia is encouraged. The goal of the task is to come as close to possible to the geo-coordinates of the videos as provided by users or their GPS devices. Similar research towards automatic geotagging of images is recently described in:

Serdyukov, P., Murdock, V., and van Zwol, R. Placing flickr photos on a map. In SIGIR 2009.

Hays, J. and Efros, A. A. im2gps: estimating geographic information from a single image. In CVPR 2008.

Target group
The task is of interest to researchers in the area of geo-IR as well as social media.

Data
The data set contains a set of geotagged Flickr videos (~10,000 for development and test purposes) and the metadata for geotagged Flickr images (~3.2 million). We also provide a set of basic visual features extracted for all images and for the frames of the videos. Evaluation of runs submitted by participating groups will be based on distances between the predicted and the actual geo-coordinates. Ground truth is supplied by Flickr users uploaded the videos and the images. All videos and images are shared by their owners under Creative Commons license.

Groundtruth and evaluation
The geo-coordinates associated with the Flickr will be used as the groundtruth. Since these do not always serve to precisely pinpoint the location of the video, we will evaluate at each of a series of widening circles: 1 km 10 km 100km 1000km 10000km

Task coordinators:
Pavel Serdyukov, Delft University of Technology
Vanessa Murdock, Yahoo! Research