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Radial Charts
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A Comparison of Radial and Linear Charts for Visualizing Daily - - PowerPoint PPT Presentation
A Comparison of Radial and Linear Charts for Visualizing Daily - - PowerPoint PPT Presentation
A Comparison of Radial and Linear Charts for Visualizing Daily Patterns Manuela Waldner , Alexandra Diehl, Denis Gracanin, Rainer Splechtna, Claudio Delrieux, Kresimir Matkovic Institute of Visual Computing & Human-Centered Technology, TU
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Radial Charts
“Processing angles is more difficult than processing linear aspects.”
[Simkin and Hastie, Journal of the American Statistical Association, 1987]
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Radial Charts
“Radial graphs also have the potentially error-prone property that the reader’s eyes must follow one of several concentric rings to map a data point to its value.”
[Goldberg and Helfman, SAGE Information Visualization 2011]
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Radial Charts
“Using polar rather than Cartesian coordinates has a pleasing aesthetic, while using space more efficiently.”
[Heer et al., Commun. ACM 2010]
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Radial Charts
“Mapping this circular behavior to a radial diagram is an intuitive concept and mirrors the data appropriately.”
[Burch and Weiskopf, Springer Handbook of Human Centric Visualization 2019]
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Radial Charts of Periodical Patterns
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[Brehmer et al., IEEE TVCG 2019]
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Radial Charts of Periodical Patterns
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[Fuchs et al., ACM CHI 2013]
“The participants also reported to like the clock metaphor. Some suggested, however, to visualize only 12 hours at a time for a more intuitive encoding.”
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Clock Metaphor
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Traffic Accidents
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https://www.kaggle.com/pavetr/nypdcollisions
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Traffic Accidents
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Rose Chart
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[Nightingale, 1858]
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Rose Chart
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[Huang et al., IEEE TVCG 2016]
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Rose Chart
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“Clock Charts”
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Study Design
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linear radial 2 x 12 1 x 24
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Study
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Untargeted Analysis
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Untargeted Analysis
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Low-Level Tasks
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Low-Level Tasks
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Low-Level Tasks
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Hypothesis
Visualizations of daily patterns using a clock-like layout can be interpreted more efficiently by untrained users than using alternative radial or linear charts.
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Untargeted Analysis
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There are a lot of accidents in the morning between 8 am and 10 am. Then again in the afternoon between 1 and 5 pm. There are a lot of accidents in the morning between 8 am and 10 am. Then again in the afternoon between 1 and 5 pm. Observation 1 Observation 2
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Locate Maximum
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Locate Maximum
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completion time accuracy
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Locate Maximum Errors
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Observation
Separating charts may attract much more attention to the first chart.
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Locate Time
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Locate Time
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completion time accuracy
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Locate Time Errors
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I found it very hard to read initially as I was trying to figure out if the 12pm on the left was for PM or AM, based on it stating AM in the center. This is very confusing.
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Rose Charts
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[Nightingale, 1858]
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Observation
Separate rose charts are difficult to follow.
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Locate Time
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[Fuchs et al., ACM CHI 2013]
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Observation
Locating an hour of a day is more efficient using a continuous, labelled, linear bar chart.
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Read Value
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Read Value
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completion time accuracy
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Read Value Errors
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It's pretty decent but I JUST noticed that each bar represents 20 accidents. Before I thought 1 bar = 1 accident because I didn't look closely enough
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Observation
Users may not know how to interpret the length of the bars in rose charts.
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Read Value Errors
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Read Value
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Read Value
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Observation
Separating radial charts may attract attention to unimportant data points.
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Feedback
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This is simpler er, less pretty or fancy but more effec ecti tive than the previous one I prefer seeing a bar graph but it could be because I am more fam amili liar ar with this. It is challen engi ging to read.
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Clock Charts?
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This is really hard rd to look at until you realize that it is showing like a clock. But the data is still diffic icult lt to decipher.
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Clock Charts?
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? ? ?
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How to Visualize Daily Patterns?
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Thank you!
Manuela Waldner
T 752-N30