Geoscience Reference
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Figure 1: Introducing tag clouds to cartography: Milgram and Jodelet's “collective mental
map of Paris” (Milgram and Jodelet 1976)
Figure 2: Web application World Explorer:1 Landmarks automatically generated from clus-
tered Flickr photo locations and their assigned tags. Bigger labels indicate bigger cluster
sizes
In the age of computer visualisation, this technique has become very popu-
lar, especially with the rise of Web 2.0. A general overview of different
layout algorithms for the generation of tag clouds is given by Viégas and
Wattenberg (2008). Several researchers have recently published on tag
cloud visualisations for cartographic contexts.
The approach of Ahern et al. (2007) exploits the public Flickr2 photo
collection. Tagged images with assigned GPS coordinates are used to com-
pute clusters of popular tags, i.e. regions with a disproportionately high
density of photos and the dominant tag of each such region are calculated.
The tag label of each cluster is placed centred at the centroids position of a
cluster and the label size is scaled according to the size of the cluster.
1 http://tagmaps.research.yahoo.com/worldexplorer.php.
2 http://www.flickr.com.
 
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