Unformatted text preview: of document collections usually two-dimensional projections are used, i.e. the high dimensional document space is mapped on a
two-dimensional surface. In order to depict individual documents or groups
of documents usually text ﬂags are used, which represent either a keyword
or the document category. Colors are frequently used to visualize the density,
e.g. the number of documents in this area, or the difference to neighboring
documents, e.g. in order to emphasize borders between different categories. If
three-dimensional projections are used, for example, the number of documents
assigned to a speciﬁc area can be represented by the z-coordinate.
Visualization of document collections requires methods that are able to group documents based on
their similarity and furthermore that visualize the similarity between discovered groups of documents. Clustering approaches that are frequently used to
ﬁnd groups of documents with similar content (Steinbach et al. 2000) – see
also section 3.2 – usually do not consider the neighborhood relations between
the obtained cluster c...
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This note was uploaded on 06/19/2011 for the course IT 2258 taught by Professor Aymenali during the Summer '11 term at Abu Dhabi University.
- Summer '11