Empirical Insights from a Study on Outlier Preserving Value Generalization in Animated Choropleth Maps

Traun, Christoph; Schreyer, Manuela; Wallentin, Gudrun

doi:10.3390/ijgi10040208

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…by averaging an epoch and a certain number of previous epochs). The elimination of outliers (Traun et al 2021) or "visual noise" based on spatiotemporal autocorrelation (Traun and Mayrhofer 2018) are also seen as a means of reducing complexity. However, there are again contradictory statements about the effect of such measuresfor example, Harrower (2001) recommends temporal smoothing, while McCabe (2009) and Traun et al (2021) could not find any improvements.…”

Section: Previous Workmentioning

confidence: 99%

Task-oriented and change preserving data classification for multi-temporal choropleth maps

Schiewe

2023

Preprint

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Series or animations of classified choropleth maps are an important form of reproducing multi-temporal, cardinally scaled data sets, especially in media. However, there are problems with such representations that are not taken into account by the known methods of data classification (such as equidistant grouping or quantiles), and therefore lead to visualisations that are not sufficiently suitable for use. On the one hand, different questions and change analyses tasks are not explicitly considered in the process of making these maps. In the following, typical change tasks are singled out (i.e. show absolute differences, absolute percentage changes, positive changes, deviations from the trend) and corresponding metrics for quantitative description are proposed. On the other hand, there are no measures in the usual procedures to avoid the loss of significant changes after classification (i.e. the regions belong to the same class). In the following, a procedure is therefore proposed that begins with rules for assigning value differences to class differences (e.g. based on statistical significance). Based on this, a preservation measure is defined that describes the success of obtaining the desired class differences after applying the classification. This measure can also be used to guide a new classification procedure. Using two multi-temporal data sets, the effects of the developed measures and methods are demonstrated both numerically and visually in corresponding choropleth maps.

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Section: Previous Workmentioning

confidence: 99%

Task-oriented and change preserving data classification for multi-temporal choropleth maps

Schiewe

2023

Preprint

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“…Popular time-series animation causes some perceptual difficulties for map users. Therefore, Traun et al [1] conducted empirical research on the effect of local outlier preserving value generalization of animated choropleth maps on the ability to detect general trends in spatiotemporal data. Such an approach results from searching for solutions to reduce the cognitive load that animated map users experience.…”

Section: Dynamic Spatiotemporal Datamentioning

confidence: 99%

Modern Cartographic Forms of Expression: The Renaissance of Multimedia Cartography

Medyńska-Gulij

Forrest

Cybulski

2021

IJGI

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This article summarizes the Special Issue of “Multimedia Cartography”. We present three main research fields in which multimedia cartography and the study of the effectiveness of multimedia maps are currently taking place. In each of these fields, we describe how published research is embedded in the broader context of map design and user studies. The research refers to contemporary technological trends such as web HTML5 standards, virtual reality, eye tracking, or 3D printing. Efficiency, performance, and usability studies of multimedia maps were also included. The research published in this issue is interdisciplinary. They combine traditional mapping methods with new technologies. They are searching for new places for cartography in, e.g., the environment of computer games. They combine the design of the map with its perception by users.

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“…In this section, we address some rationales of cognitive cartographic experimental design using a real-world example. The experiment was applied in a full-scale empirical study (Traun, Schreyer, & Wallentin, 2021), aiming to examine whether and how different forms of value generalization of unclassed choropleth map animations affect the ability of users to detect general trends and local outliers thereof. The experiment was in two parts.…”

Section: An Experiments On Value Generalization In Animated Mapsmentioning

confidence: 99%

“…While analysis and discussion of the data from a cognitive perspective are outside the scope of this paper (see Traun et al (2021)), the data allowed us to empirically analyse and compare the statistical power of the within-subject and the between-subject designs, as outlined in the following section.…”

Section: Participants and Datamentioning

confidence: 99%

Design of an Experiment to Evaluate Modes of Value Generalization in Animated Choropleth Maps

Traun

Wallentin

Schreyer³

2021

giforum

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In this research, we discuss five design parameters found in cognitive studies related to animated choropleth maps and compare existing studies accordingly. With reference to these parameters, we present the design of an experiment to assess how different forms of value generalization in choropleth map animation affect the perception of overall trends and local deviations therefrom. The mixed study design of the experiment allowed a direct comparison of within-subject and between-subject designs. Using repeated subsampling of our empirical data, the greater statistical power of the within-subject design was proven, even when correcting for differences in the number of data elements analysed.

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Empirical Insights from a Study on Outlier Preserving Value Generalization in Animated Choropleth Maps

Cited by 7 publications

References 43 publications

Task-oriented and change preserving data classification for multi-temporal choropleth maps

Task-oriented and change preserving data classification for multi-temporal choropleth maps

Modern Cartographic Forms of Expression: The Renaissance of Multimedia Cartography

Design of an Experiment to Evaluate Modes of Value Generalization in Animated Choropleth Maps

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