DBPapers
DOI: 10.5593/SGEM2014/B23/S11.082

GREEN VERSUS RED: EYE-TRACKING EVALUATION OF SEQUENTIAL COLOUR SCHEMES

A. Brychtova, A. Vondrakova
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 643-650 pp

ABSTRACT
Methods of cartographic visualization are closely related to the use of colour schemes. There are a number of coloured scales that are included in the default menu of GIS and graphic software, but the appropriateness of the colour scale is in many cases questionable – not only because of the thematic suitability, but also with the focus on the user ability to get the information provided in the map. In addition to choosing a suitable colour scheme it is also very important to select number of intervals that can be used for various base hues. The main goal of this contribution is to describe design and results of an eye-tracking experiment, which was aimed at evaluating the efficiency of two different sequential colour schemes. The research is based on the theory which states that the human ability to distinguish colour shades in various parts of light spectrum varies. Some colour brightness continuum could provide more discriminable shades than another one. Within presented study only brightness continua of green and red were evaluated. Experimental stimuli are represented by 6-classes choropleth maps. The design of applied sequential colour schemes was developed based on results of the previous research. Colour distance steps between classes of both colour schemes are given by values determined by the method CIEDE2000 ΔE00= 6, 8, 10, 8 and 6. The presented experiment was carried out in a controlled eye-tracking laboratory in which participants were asked to find depicted area on the choropleth map and match it with the corresponding legend class by its colour. Eye-tracking methods were utilized to complement usability metrics such as measured accuracy, time to answer and selected eye tracking metrics: fixation frequency, fixation duration, scanpath speed and other scanpath characteristics comparison. Eye-tracking technology is one of the modern trends in assessing the suitability of different methods of cartographic visualization and generally on the assessment of user aspects in cartography. The right choice of visual variables, including colours, is a fundamental determinant of successful transfer of information from the map to the user.

Keywords: Eye-tracking, Choropleth maps, Usability, Colour, CIEDE2000

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