Zsfg. H3

• Auf welchem früheren Visualisierungsverfahren baut H3 auf? (neu @ 20040704)
• Was ist H3? (neu @ 20040704)
• Was grenzt H3 gegenüber Walrus ab? (neu @ 20040704)
• Wofür steht "H3"? (nicht beantwortet @ 20040703) (neu @ 20040704)
• Wie viele Knoten kann H3 verwalten? (neu @ 20040704)
• Warum H3 adaptieren? (neu @ 20040704)
• Welches Layouting-Verfahren benutzt H3? (neu @ 20040704)
• Download-Quelle: H3: Download-Seite und runtergeladene Daten
• Paper(s): Graph-Visualisierung: Munzner: H3, Literatur- und Software-Links; Biographie

HTV-Beschreibung

"Hyperbolic graph layout uses a context + focus technique to represent and manipulate large tree hierarchies on limited screen size. Hyperbolic trees are based on Poincare's model of the (hyperbolic) non-Euclidean plane. Experience non-Euclidean Geometry with Paul Garrett's applet! John Lamping, Ramana Rao and Peter Pirolli rediscovered hyperbolic spaces in 1995 for information visualization. Tamara Munzner at Stanford University developed a 3D hyperbolic viewer in her Ph.D. thesis.

The hyperbolic layout employs the following techniques:

• Radical Layout: Conventionally, trees are displayed on a Euclidean plane with the root at the top and children below their parents and connected to their parents with edges. The hyperbolic layout uses a radical layout. The root is placed at the center while the children are placed at an outer ring to their parents. The circumference jointly increases with the radius and more space becomes available for the growing numbers of intermediate and leaf nodes.
• Distortion Technique: Hyperbolic layout uses a nonlinear
  (distortion) technique to accommodate focus and context for a large number of nodes.
• Non Overlapping:To ensure that nodes do not overlap each other, hyperbolic layout algorithms assign an open angle for each node. All children of a node are laid out in this open angle.
• Refocusing: Transformations are provided to allow fluent node repositioning. Users can click on a node to move it to the center or to grab and reposition a single node."

(Quelle @ 20040531.00-56, Abschnitt "Description")

Einige Google-Treffer zu "visualization of thesauri"

noch ein paar Links, die ich als Hinweise erhalten habe:

• Software für die Erstellung und Pflege von Thesauri (© 1998 Umweltbundesamt Österreich)
• Visualisierung von Information im Cyberspace
• Thinkmap
• Wordnet
• Visual Browsing in Web and non-Web Databases
• Information Retrieval by Semantic Analysis and Visualization of the Concept Space of D-Lib Magazine
• Abhandlung über Visualisierung [PDF] enthält Verweise auf Munzner & co.
• Präsentation der Visualisierung-Software VxInsight [PDF]

Vielen Dank an Ralf!