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Color for online mapping: Still difficult to choose by Beate Weninger (g2lab, HCU Hamburg)
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Color for online mapping: Still difficult to choose by Beate Weninger (g2lab, HCU Hamburg)

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Presented at the ICC 2013 pre-confernece workshop "mapping in a digital world"

Presented at the ICC 2013 pre-confernece workshop "mapping in a digital world"

Published in: Technology, Health & Medicine
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  • 1. beate.weninger@hcu-hamburg.de @beaweb Color for Online Mapping: Still Difficult to Choose ICC 2013 pre-conference workshop "Mapping in a digital world"
  • 2. Motivation Official traffic noise map of the city of Hamburg Color scale according DIN 18005-2
  • 3. Color and Cartography // Color Advice
  • 4. Colors of a scale should according to Levkowitz (1996): 1. „Preserve the order of the original values“; 2. “convey uniformity among values they are representing, and representative distances between them; and 3. create no artificial boundaries that do not exist in the original data.” Color and Cartography // Guidelines
  • 5. Color and Cartography // Color Perception  Physical reactions, e.g.  Simultaneous contrast (1)  Perception of object size  Effect of object size  Depth effect (2) Lübbe 2013 (2) (1)
  • 6. Color and Cartography // Color Perception  Psychological reactions, e.g.  Color perception is influenced by the object (shape)  Emotional reactions  Trust issues
  • 7. Color and Cartography // Color Perception  Color vision deficiencies Official color scale according DIN 18005-2 transformed
  • 8. Color Design Aspects for Webmapping 1. Harmonical hierarchy  Only systematic variation of lightness and saturation  Consider spatial distribution for balanced scales (order, complexity, object size) 2. Nature of the Scale: logarithmic etc. 3. Consistency 4. Qualitative meaning 5. Consider CVDs and situational CVDs
  • 9. Design Challenges  Variety of screen sizes and use cases  Practitioners‘ wish list  Many classes  Flexible scale  Traffic light system
  • 10. New Scale // Qualitative Aspects Different hues in a harmonical order with few lightness steps per hue supports recognition! Card sorting task showed: users would order greens differently!
  • 11. New Scale // CVD Normal Vision deuteranopia (green-blindness) protanopia (red-blindness)
  • 12. Conclusion // Focusing on Neocartography  How can we abandon rainbow and traffic light schemes? (Why are they still available in software?)  Do screen sizes and use cases effect color perception?  Clear rules are needed that support map-makers from a non-traditional background  ColorBrewer 2.0 extension? Let`s bring the topic back on the to-do list!
  • 13. Conclusion // Focusing on Neocartography  How can we abandon rainbow and traffic light schemes? (Why are they still available in software?)  Do screen sizes and use cases effect color perception?  Clear rules are needed that support map-makers from a non-traditional background  ColorBrewer 2.0 extension? Let`s bring the topic back on the to-do list! # What’s the map-maker’s aim? (raise awareness, bring forward an argument, aesthetic map…) # What’s most important: discriminability of colors, trust in the map, visualize distribution of values… # Is there a critical value in the scale that should be highlighted? # ….
  • 14. More on Color ICC Papers on color:  Weninger: The Effects of Colour on the Interpretation of Traffic Noise in Strategic Noise Maps  Kröger, Schiewe, Weninger: Analysis and Improvement of the OpenStreetMap Street Color Scheme for Users with Color Vision Deficiencies beate.weninger@hcu-hamburg.de @beaweb
  • 15. References  Levkowitz, H. (1996). Perceptual Steps along Color Scales. International Journal of Imaging Systems and Technology 7, 97–101.  Lübbe, E. (2012). Farbempfindung, Farbbeschreibung und Farbmessung: Eine Formel für die Farbsättigung. Springer: Berlin, Heidelberg, New York.

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