[Home]InformationVisualization

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From the excellent survey paper, http://www.cwi.nl/InfoVisu/Survey/StarGraphVisuInInfoVis.pdf, which is part of http://www.cwi.nl/InfoVisu...

Information visualization has become a large field and “sub–fields” are beginning to emerge. A simple way to determine the applicability of graph visualization is to consider the following question: is there an inherent relation among the data elements to be visualized? If the answer to the question is “no”, than data elements are “unstructured” and the goal of the information visualization system might be to help discover relations among data through visual means. If, however, the answer to the question is “yes”, then the data can be represented by the nodes of a graph, with the edges representing the relations.

Graph visualization has many areas of application. Most people have encountered a file hierarchy on a computer system. A file hierarchy can be represented as a tree (a special type of graph). It is often necessary to navigate through the file hierarchy in order to find a particular file. Anyone who has done this has probably experienced a few of the problems involved in graph visualization: “Where am I?” “Where is the file that I'm looking for?” Other familiar types of graphs include the hierarchy illustrated in an organisational chart and taxonomies that portray the relations between species. Web site maps are another application of graphs as well as browsing history. In biology and chemistry, graphs are applied to evolutionary trees, phylogenetic trees, molecular maps, genetic maps, biochemical pathways, and protein functions. Other areas of application include object–oriented systems (class browsers), data structures (compiler data structures in particular), real–time systems (state–transition diagrams, Petri nets), data flow diagrams, subroutine–call graphs, entity relationship diagrams (e.g. UML and database structures), semantic networks and knowledge–representation diagrams, project management (PERT diagrams), logic programming (SLD–trees), VLSI (circuit schematics), virtual reality (scene graphs), and document management systems. Note that the information isn’t always guaranteed to be in a purely hierarchical format — this necessitates techniques which can deal with more general graphs than trees.

See more in the [CategoryInformationVisualization].

CategoryInformationVisualization

External resources


Glossary of Terms


Quick Links

Infosthetics WebLog
http://www.infosthetics.com
Visual Complexity, a wonderful directory of visualizations
http://www.visualcomplexity.com/vc/
Robert Horn's Visual Language research
http://www.stanford.edu/~rhorn/
a taxonomy of Information Visualization Techniques
http://www.imv.is.ocha.ac.jp:8080/~rika2/iv/
Walrus - graph visualisation tool
http://www.caida.org/tools/visualization/walrus/
Walrus is a graph visualization tool that uses hyperbolic geometry for visualizing large directed graphs, where large is on the order of a million nodes, and about as many links.
ArgoUML- a java based open source UML tool
http://argouml.tigris.org
Schie's ConceptMapping? survey
http://www.observetory.com/conceptmappingvs1.htm
PingMag? article summarizing some of the most beautiful visualizations.
http://pingmag.jp/2007/03/23/infosthetics-form-follows-data/
Eric Blue's favourite visualizations: http://eric-blue.com/blog/2006/10/dataesthetics_the_power_and_be.html
the Visual Wiki discusses Robert Horn's Visual language and occasionally information visualization
http://visualwiki.org/


References

Jacobson, N. and Bender, W. (1996) Color as a determined communication. IBM Systems Journal, 35(3&4), 526-538. Available from http://www.research.ibm.com/journal/sj/mit/sectiond/jacobson.html


This class (and its assigned readings) may be interesting to some:

[Visualizations in Learning overview] and [syllabus]


Discussion

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