Exploring the Influence of Colour Distance and Legend Position on Choropleth Maps Readability

Brychtová, Alžběta

doi:10.1007/978-3-319-07926-4_23

Cited by 8 publications

(6 citation statements)

References 14 publications

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“…The accompanying analysis, including regression models and the more advanced GWR, are presented in the Supplemental Material section where we further discuss our claims. In order to ensure the best possible map readability, sequential colour schemes were constructed following the principle of defining sufficient colour separation between individual shades as described by Brychtová (2015) and Brychtová and Çöltekin (2017). Data and the R code can be downloaded from Dataverse 2 (Lysek, 2020).…”

Section: Methodsmentioning

confidence: 99%

Who are the voters and where are they? Using spatial statistics to analyse voting patterns in the parliamentary elections of the Czech Republic

2020

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The mapping of election results has long been a popular topic among cartographers, journalists, data scientists and infographic authors. However, their work usually concludes with simple visualizations of a single election, and in most cases only the winning party is represented. Can we tell the story of a political party over two decades via maps? What were the reasons for the rise and fall of such party; in our case the Czech Social Democrats? Moreover, how were the changes in voting patterns spatially distributed and manifested? With our paper, we explore voting patterns as well as the voting history of specific parties related to the fate of Social Democrats in the Czech Republic in several national elections from 2006 to 2017. We would like to invite other political scientists to explore the election results in their countries, not just over time, but also in space, and ideally via maps.

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Section: Methodsmentioning

confidence: 99%

Who are the voters and where are they? Using spatial statistics to analyse voting patterns in the parliamentary elections of the Czech Republic

2020

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“…1). CIELAB is a device-independent colour model, which means that results are consistent regardless of where and how colours are imaged (Brychtova, 2016). The CIELAB model measures the colour distance between two colours using three values, which are expressed as numbers that fall within a range and can be easily compared to other values within the same model.…”

Section: Objectivesmentioning

confidence: 99%

“…In her application "ColourBrewer 2.0" (https://colourbrewer2.org/), she manages a choice of colour scale of three to nine intervals. Brychtova (2016) evaluated colour distances in sequential scales from the application ColourBrewer 2.0 and found that colour distances between individual scales are not constant. This is despite the fact that ColorBrewer includes "learn more" tutorials to help users get their bearings, encourages them to test colour schemes as maps and legends, and provides output in five colour specification systems (Harrower, Brewer, 2003).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Assessment of the quality of colour scales: a case study "Landscape Atlas of Czech Republic"

Vozenilek,

Lachova

2023

Proc. Int. Cartogr. Assoc.

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Abstract. The atlas, as a typical product of thematic cartography, is characterized by cohesive approaches in the procedures of atlas compilation. One of the results of these cohesive approaches is the uniform setting of colour scales in choropleth maps. The paper aims to evaluate the quality of colour scales in choropleth maps in an atlas from the point of view of systematic visualization, using the example of the electronic version of the Landscape Atlas of the Czech Republic. A total of 56 sequential and 6 divergent colour scales were selected from the Atlas. Seven hypotheses related to colours were formulated and then tested. The paper assumes that the colour scales in the atlas are not uniformly constructed. The authors hypothesise the approach by which the creators of the atlas chose these colours. In the CIELAB colour model, the colour distances between the colours of the intervals were measured, calculated, statistically evaluated and graphically expressed. The colour scales were also evaluated against the background of the map sheets. The results revealed the nature of the approach of the authors of the Atlas when compiling colour scales of choropleth maps. The aim of the paper was also to define the criteria for evaluating the quality of colour scales and to formulate recommendations for the compilation of colour scales. These recommendations should help map makers to create high-quality atlas maps and users to get more accurate and faster information from maps.

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“…The appropriate selection of the used color schemes may lead to the optimal quality of the cartographic product, as well as to the effective discrimination of different classes by the map user. In a series of eye tracking experimental studies (Brychtová, 2015;Brychtová and Çöltekin, 2016;2017), the influence of color distance in map legibility is examined. They revealed that the relation between color distance and map ability was positive (Brychtová, 2015) while larger color distances contributed to the better performance of map users (Brychtová and Çöltekin, 2016).…”

Section: Cartographic Symbolization and Design Principlesmentioning

confidence: 99%

Geodesy and Cartography

Krassanakis

Cybulski

2019

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Eye tracking constitutes a valuable tool for the examination of human visual behavior since it provides objective measurements related to the performed visual strategies during the observation of any type of visual stimuli. Over the last decade, eye movement analysis contributed substantially to the better understanding of how visual attention processes work in different types of maps. Considering the clear need for the examination of map user reaction during the observation of realistic cartographic products (i.e. static maps, animated maps, interactive and multimedia maps), a critical amount of experimental studies were performed in order to study different aspects related to map reading process by the cartographic community. The foundation of these studies is based on theories and models that have been developed in similar research domains (i.e. psychology, neuroscience etc.), while the research outcomes that produced over these years can be used directly for the design of more effective and efficient maps. The aim of the present article is to summarize and present the current panorama of the existing eye tracking studies in cartographic research appeared over the last decade. Additionally, methodological contributions (including analysis tools) of cartographic society in the field of eye movement analysis are reported, while existing challenges and future perspectives are also discussed.

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Exploring the Influence of Colour Distance and Legend Position on Choropleth Maps Readability

Cited by 8 publications

References 14 publications

Who are the voters and where are they? Using spatial statistics to analyse voting patterns in the parliamentary elections of the Czech Republic

Who are the voters and where are they? Using spatial statistics to analyse voting patterns in the parliamentary elections of the Czech Republic

Assessment of the quality of colour scales: a case study "Landscape Atlas of Czech Republic"

Geodesy and Cartography

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