Semiology of Graphics: Diagrams Networks Maps.

. We present an analysis of the influence of colour distance on the user experience with choropleth maps. We systematically evaluated 5 se-quential and 5 qualitative colour schemes in a two-stage user experiment. At first, we conducted an online study to obtain performance metrics accu-racy and response time on a large variety of heterogeneous population. Following this, in a controlled lab study with eye-tracking, we re-examined the findings from the online study for a subset of experimental stimuli and further assessed the user experience through an analysis of their visual be-haviour. In this process, along with accuracy and response time , eye track-ing metrics fixation frequency, fixation duration and scanpath speed as well as a gaze transition analysis were utilized. In both experiments, par-ticipants were asked to compare two areas with controlled colour distances between them, and decide whether these areas are of the same colour. Re-sults suggest that we are able to discriminate narrower colour distances than commonly used in practice, however, not as narrow as suggested in previous literature.

Discriminating Sequential and Qualitative Col- our Schemes on Choropleth Maps

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Discriminating Sequential and Qualitative Col- our Schemes on Choropleth Maps