Non-overlapping Aggregated Multivariate Glyphs for Moving Objects

In moving object visualization, objects and their attributes are commonly represented by glyphs on a geographic map. In areas on the map densely populated by these objects, visual clutter and occlusion of glyphs occur. We propose a method to solve this problem by partitioning the set of all objects...

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Published in:IEEE Pacific Visualization Symposium pp. 17 - 24
Main Authors: Scheepens, Roeland, Van De Wetering, Huub, Van Wijk, Jarke J.
Format: Conference Proceeding
Language:English
Published: IEEE 01.03.2014
Subjects:
Clutter
Computer GraphicsPicture/Image Generation
Data visualization
Glyph-based Techniques (primary keyword)
Lenses
Merging
Scalability Issues
Trajectory
Visualization
ISSN:2165-8765
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Abstract In moving object visualization, objects and their attributes are commonly represented by glyphs on a geographic map. In areas on the map densely populated by these objects, visual clutter and occlusion of glyphs occur. We propose a method to solve this problem by partitioning the set of all objects into subsets that are each visualized using an aggregated multivariate glyph that shows the distribution of several attributes of its objects, such as heading, type and velocity. We choose the combination of subsets and glyph design such that the glyphs do not overlap and the number of subsets is approximately maximal. The partition is maintained and updated while the objects move. We use examples from the maritime domain, but our method is applicable to a wider range of dynamic data. Through a user study we find that, for a set of representative tasks, our method does not perform significantly worse than competitive visualizations with respect to correctness. Furthermore, it performs significantly better for density comparison tasks in high density data sets. We also find that the participants of the user study have a preference for our method.
AbstractList In moving object visualization, objects and their attributes are commonly represented by glyphs on a geographic map. In areas on the map densely populated by these objects, visual clutter and occlusion of glyphs occur. We propose a method to solve this problem by partitioning the set of all objects into subsets that are each visualized using an aggregated multivariate glyph that shows the distribution of several attributes of its objects, such as heading, type and velocity. We choose the combination of subsets and glyph design such that the glyphs do not overlap and the number of subsets is approximately maximal. The partition is maintained and updated while the objects move. We use examples from the maritime domain, but our method is applicable to a wider range of dynamic data. Through a user study we find that, for a set of representative tasks, our method does not perform significantly worse than competitive visualizations with respect to correctness. Furthermore, it performs significantly better for density comparison tasks in high density data sets. We also find that the participants of the user study have a preference for our method.
Author Van Wijk, Jarke J.
Scheepens, Roeland
Van De Wetering, Huub
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Snippet In moving object visualization, objects and their attributes are commonly represented by glyphs on a geographic map. In areas on the map densely populated by...
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StartPage 17
SubjectTerms Clutter
Computer GraphicsPicture/Image Generation
Data visualization
Glyph-based Techniques (primary keyword)
Lenses
Merging
Scalability Issues
Trajectory
Visualization
Title Non-overlapping Aggregated Multivariate Glyphs for Moving Objects
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