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Semantic-Based Navigation in Open Spaces 289
Figure 10-15. Example of spatial visualization in the GVista system by Geonova.
Circles represent nodes, their size corresponds to the size of the respective subtree rooted
at a particular node. Child nodes are sorted in descending order based on their size. Different
layout strategies are employed based on the size distribution of child nodes (e.g.,
dominant child node, equal sized children).
Figure 10-16. Topology sensitive visualization via CropCircles, taken from (Wang & Parsia, 2006).
Layout strategies from left to right – single child, equally sized children, dominant child, no dominant
child.
Figure 10-17 shows TagSphere – an approach to tag visualization for augmented contentbased
image retrieval using collaborative tagging (Aurnhammer, Hanappe, & Steels, 2006).
The white circle in the center denotes the user’s image collection yet also a query-byexample.
Next, the Tag sphere – sets of search results corresponding to tags from the query
are drawn. Their size denotes the number of images, distance to the white circle denotes