EuroVisShort2015

Permanent URI for this collection

Cagliari, Italy, May 25 – 29, 2015
Volume and Flow Visualization
WebGL-Enabled Remote Visualization of Smoothed Particle Hydrodynamics Simulations
Jennifer Chandler, Harald Obermaier, and Kenneth I. Joy
Visualization and Analysis of Large-Scale Atomistic Simulations of Plasma-Surface Interactions
Wathsala Widanagamaachchi, Karl Hammond, Li-Ta Lo, Brian Wirth, Francesca Samsel, Christopher Sewell, James Ahrens, and Valerio Pascucci
Exploratory Performance Analysis and Tuning of Parallel Interactive Volume Visualization on Large Displays
Alexandros Panagiotidis, Steffen Frey, and Thomas Ertl
A Quality-Preserving Cartesian to Body-Centered Cubic Downsampling Transform
Usman R. Alim and Thiago Valentin de Oliveira
Improved Sparse Seeding for 3D Electrostatic Field Lines
Katrin Scharnowski, Sebastian Boblest, and Thomas Ertl
Clustering Moment Invariants to Identify Similarity within 2D Flow Fields
Roxana Bujack, Jens Kasten, Vijay Natarajan, Gerik Scheuermann, and Kenneth I. Joy
Geospatial and Large Scale Visualization
Dynamic Scheduling for Progressive Large-Scale Visualization
Markus Flatken, Anne Berres, Jonas Merkel, Ingrid Hotz, Andreas Gerndt, and Hans Hagen
Analyzing the Evolution of the Internet
Thienne Johnson, Carlos Acedo, Stephen Kobourov, and Sabrina Nusrat
OceanPaths: Visualizing Multivariate Oceanography Data
Carolina Nobre and Alexander Lex
Ambient Grids: Maintain Context-Awareness via Aggregated Off-Screen Visualization
Dominik Jäckle, Florian Stoffel, Bum Chul Kwon, Dominik Sacha, Andreas Stoffel, and Daniel A. Keim
Task Taxonomy for Cartograms
Sabrina Nusrat and Stephen Kobourov
A Testbed Combining Visual Perception Models for Geographic Gaze Contingent Displays
Kenan Bektas, Arzu Cöltekin, Jens Krüger, and Andrew T. Duchowski
Design and Applications
Visualizing Dynamic Brain Networks Using an Animated Dual-Representation
Chihua Ma, Robert V. Kenyon, Angus G. Forbes, Tanya Berger-Wolf, Bernard J. Slater, and Daniel A. Llano
Visual Analytics ofWork Behavior Data - Insights on Individual Differences
Saskia Koldijk, Jürgen Bernard, Tobias Ruppert, Jörn Kohlhammer, Mark Neerincx, and Wessel Kraaij
Exploratory Text Analysis using Lexical Episode Plots
Valentin Gold, Christian Rohrdantz, and Mennatallah El-Assady
Visualization-assisted Insights into Home Energy Usage
Matthew Law, Sami Rollins, Nilanjan Banerjee, and Alark Joshi
PoPI: Glyph Designs for Collaborative Filtering on Interactive Tabletops
Sven Charleer, Joris Klerkx, and Erik Duval
Visual Techniques to Support Exploratory Analysis of Temporal Graph Data
Natalie Kerracher, Jessie Kennedy, Kevin Chalmers, and Martin Graham
Design Process and Evaluation
Towards Understanding Enjoyment and Flow in Information Visualization
Bahador Saket, Carlos Scheidegger, and Stephen G. Kobourov
ColorCAT: Guided Design of Colormaps for Combined Analysis Tasks
Sebastian Mittelstädt, Dominik Jäckle, Florian Stoffel, and Daniel A. Keim
Card Sorting Techniques for Domain Characterization in Problem-driven Visualization Research
Ryo Sakai and Jan Aerts
Bridging the Gap of Domain and Visualization Experts with a Liaison
Svenja Simon, Sebastian Mittelstädt, Daniel A. Keim, and Michael Sedlmair
Interaction with Uncertainty in Visualisations
Advait Sarkar, Alan F. Blackwell, Mateja Jamnik, and Martin Spott
State of the Art in Mobile Volume Rendering on iOS Devices
Alexander Schiewe, Mario Anstoots, and Jens Krüger

BibTeX (EuroVisShort2015)
@inproceedings{
10.2312:eurovisshort.20151116,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
WebGL-Enabled Remote Visualization of Smoothed Particle Hydrodynamics Simulations}},
author = {
Chandler, Jennifer
and
Obermaier, Harald
and
Joy, Kenneth I.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151116}
}
@inproceedings{
10.2312:eurovisshort.20151117,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Visualization and Analysis of Large-Scale Atomistic Simulations of Plasma-Surface Interactions}},
author = {
Widanagamaachchi, Wathsala
and
Hammond, Karl
and
Lo, Li-Ta
and
Wirth, Brian
and
Samsel, Francesca
and
Sewell, Christopher
and
Ahrens, James
and
Pascucci, Valerio
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151117}
}
@inproceedings{
10.2312:eurovisshort.20151118,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Exploratory Performance Analysis and Tuning of Parallel Interactive Volume Visualization on Large Displays}},
author = {
Panagiotidis, Alexandros
and
Frey, Steffen
and
Ertl, Thomas
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151118}
}
@inproceedings{
10.2312:eurovisshort.20151119,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
A Quality-Preserving Cartesian to Body-Centered Cubic Downsampling Transform}},
author = {
Alim, Usman R.
and
Oliveira, Thiago Valentin de
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151119}
}
@inproceedings{
10.2312:eurovisshort.20151120,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Improved Sparse Seeding for 3D Electrostatic Field Lines}},
author = {
Scharnowski, Katrin
and
Boblest, Sebastian
and
Ertl, Thomas
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151120}
}
@inproceedings{
10.2312:eurovisshort.20151121,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Clustering Moment Invariants to Identify Similarity within 2D Flow Fields}},
author = {
Bujack, Roxana
and
Kasten, Jens
and
Natarajan, Vijay
and
Scheuermann, Gerik
and
Joy, Kenneth I.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151121}
}
@inproceedings{
10.2312:eurovisshort.20151122,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Dynamic Scheduling for Progressive Large-Scale Visualization}},
author = {
Flatken, Markus
and
Berres, Anne
and
Merkel, Jonas
and
Hotz, Ingrid
and
Gerndt, Andreas
and
Hagen, Hans
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151122}
}
@inproceedings{
10.2312:eurovisshort.20151123,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Analyzing the Evolution of the Internet}},
author = {
Johnson, Thienne
and
Acedo, Carlos
and
Kobourov, Stephen
and
Nusrat, Sabrina
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151123}
}
@inproceedings{
10.2312:eurovisshort.20151125,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Ambient Grids: Maintain Context-Awareness via Aggregated Off-Screen Visualization}},
author = {
Jäckle, Dominik
and
Stoffel, Florian
and
Kwon, Bum Chul
and
Sacha, Dominik
and
Stoffel, Andreas
and
Keim, Daniel A.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151125}
}
@inproceedings{
10.2312:eurovisshort.20151124,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
OceanPaths: Visualizing Multivariate Oceanography Data}},
author = {
Nobre, Carolina
and
Lex, Alexander
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151124}
}
@inproceedings{
10.2312:eurovisshort.20151126,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Task Taxonomy for Cartograms}},
author = {
Nusrat, Sabrina
and
Kobourov, Stephen
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151126}
}
@inproceedings{
10.2312:eurovisshort.20151127,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
A Testbed Combining Visual Perception Models for Geographic Gaze Contingent Displays}},
author = {
Bektas, Kenan
and
Cöltekin, Arzu
and
Krüger, Jens
and
Duchowski, Andrew T.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151127}
}
@inproceedings{
10.2312:eurovisshort.20151128,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Visualizing Dynamic Brain Networks Using an Animated Dual-Representation}},
author = {
Ma, Chihua
and
Kenyon, Robert V.
and
Forbes, Angus G.
and
Berger-Wolf, Tanya
and
Slater, Bernard J.
and
Llano, Daniel A.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151128}
}
@inproceedings{
10.2312:eurovisshort.20151129,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Visual Analytics of Work Behavior Data - Insights on Individual Differences}},
author = {
Koldijk, Saskia
and
Bernard, Jürgen
and
Ruppert, Tobias
and
Kohlhammer, Jörn
and
Neerincx, Mark
and
Kraaij, Wessel
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151129}
}
@inproceedings{
10.2312:eurovisshort.20151130,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Exploratory Text Analysis using Lexical Episode Plots}},
author = {
Gold, Valentin
and
Rohrdantz, Christian
and
El-Assady, Mennatallah
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151130}
}
@inproceedings{
10.2312:eurovisshort.20151132,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
PoPI: Glyph Designs for Collaborative Filtering on Interactive Tabletops}},
author = {
Charleer, Sven
and
Klerkx, Joris
and
Duval, Erik
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151132}
}
@inproceedings{
10.2312:eurovisshort.20151133,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Visual Techniques to Support Exploratory Analysis of Temporal Graph Data}},
author = {
Kerracher, Natalie
and
Kennedy, Jessie
and
Chalmers, Kevin
and
Graham, Martin
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151133}
}
@inproceedings{
10.2312:eurovisshort.20151131,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Visualization-assisted Insights into Home Energy Usage}},
author = {
Law, Matthew
and
Rollins, Sami
and
Banerjee, Nilanjan
and
Joshi, Alark
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151131}
}
@inproceedings{
10.2312:eurovisshort.20151134,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Towards Understanding Enjoyment and Flow in Information Visualization}},
author = {
Saket, Bahador
and
Scheidegger, Carlos
and
Kobourov, Stephen G.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151134}
}
@inproceedings{
10.2312:eurovisshort.20151135,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
ColorCAT: Guided Design of Colormaps for Combined Analysis Tasks}},
author = {
Mittelstädt, Sebastian
and
Jäckle, Dominik
and
Stoffel, Florian
and
Keim, Daniel A.
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151135}
}
@inproceedings{
10.2312:eurovisshort.20151137,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Bridging the Gap of Domain and Visualization Experts with a Liaison}},
author = {
Simon, Svenja
and
Mittelstädt, Sebastian
and
Keim, Daniel A.
and
Sedlmair, Michael
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151137}
}
@inproceedings{
10.2312:eurovisshort.20151138,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Interaction with Uncertainty in Visualisations}},
author = {
Sarkar, Advait
and
Blackwell, Alan F.
and
Jamnik, Mateja
and
Spott, Martin
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151138}
}
@inproceedings{
10.2312:eurovisshort.20151136,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
Card Sorting Techniques for Domain Characterization in Problem-driven Visualization Research}},
author = {
Sakai, Ryo
and
Aerts, Jan
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151136}
}
@inproceedings{
10.2312:eurovisshort.20151139,
booktitle = {
Eurographics Conference on Visualization (EuroVis) - Short Papers},
editor = {
E. Bertini and J. Kennedy and E. Puppo
}, title = {{
State of the Art in Mobile Volume Rendering on iOS Devices}},
author = {
Schiewe, Alexander
and
Anstoots, Mario
and
Krüger, Jens
}, year = {
2015},
publisher = {
The Eurographics Association},
DOI = {
10.2312/eurovisshort.20151139}
}

Browse

Recent Submissions

Now showing 1 - 25 of 25
  • Item
    Frontmatter: Eurographics Conference on Visualization (EuroVis) 2015 - Short Papers
    (Eurographics Association, 2015) Bertini, Enrico; Kennedy, Jessie; Puppo, Enrico; -
  • Item
    WebGL-Enabled Remote Visualization of Smoothed Particle Hydrodynamics Simulations
    (The Eurographics Association, 2015) Chandler, Jennifer; Obermaier, Harald; Joy, Kenneth I.; E. Bertini and J. Kennedy and E. Puppo
    Large-scale simulations are often performed on machines without the necessary graphics hardware for visualization. Transferring full resolution data to a suitable machine for visualization is impractical and undesirable. We investigate solutions to the remote visualization problem for large-scale Smoothed Particle Hydrodynamics (SPH) simulations. Previous remote visualization strategies for SPH perform rendering on the server side and send rendered images to the client viewer. These approaches suffer from delays due to network latency in sending entire images every frame and adversely affect interactive visual data analysis. WebGL enables hardware acceleration for rendering in the browser. We combine WebGL volume rendering rendering with data compression and intelligent streaming to provide a fast and flexible remote visualization solution for SPH simulations, which enables easier access to simulations for analysis and sharing of data.
  • Item
    Visualization and Analysis of Large-Scale Atomistic Simulations of Plasma-Surface Interactions
    (The Eurographics Association, 2015) Widanagamaachchi, Wathsala; Hammond, Karl; Lo, Li-Ta; Wirth, Brian; Samsel, Francesca; Sewell, Christopher; Ahrens, James; Pascucci, Valerio; E. Bertini and J. Kennedy and E. Puppo
    We present a simulation-visualization pipeline that uses the LAMMPS Molecular Dynamics Simulator and the Visualization Toolkit to create a visualization and analysis environment for atomistic simulations of plasma-surface interactions. These simulations are used to understand the origin of fuzz-like, microscopic damage to tungsten and other metal surfaces by helium. The proposed pipeline serves both as an aid to visualization, i.e. drawing the surfaces of gas bubbles and voids/cavities in the metal, as well as a means of analysis, i.e. extracting various statistics and gas bubble evolution details. The result is a better understanding of the void and bubble formation process that is difficult if not impossible to get using conventional atomistic visualization software.
  • Item
    Exploratory Performance Analysis and Tuning of Parallel Interactive Volume Visualization on Large Displays
    (The Eurographics Association, 2015) Panagiotidis, Alexandros; Frey, Steffen; Ertl, Thomas; E. Bertini and J. Kennedy and E. Puppo
    We present an exploratory approach to performance analysis and tuning of interactive parallel volume visualization for large displays. While traditional approaches target non-interactive applications and focus on separate specialized views for post-mortem performance analysis, we show metrics from the GPU and volume ray casting together with the volume visualization and allow users to interact with both of them simultaneously. With this, users can explore the data set together with the corresponding metrics to investigate both the visual and the performance impact of different parameter settings jointly, like camera position, sampling density, or acceleration technique. In particular, this supports parameter tuning by providing the user not only with timings and quality measures, but also internal metrics from the GPU and the ray caster that help to understand the connection between parameter settings and their induced outcome. We demonstrate the usage and utility of our approach for performance analysis and tuning at the example of distributed volume ray casting for a high-resolution powerwall with the goal to achieve interactive frame rates with the best possible image quality.
  • Item
    A Quality-Preserving Cartesian to Body-Centered Cubic Downsampling Transform
    (The Eurographics Association, 2015) Alim, Usman R.; Oliveira, Thiago Valentin de; E. Bertini and J. Kennedy and E. Puppo
    The body-centered cubic lattice is the optimal sampling lattice in three dimensions. However, most volumetric datasets are acquired on the well-known Cartesian cubic lattice. In order to leverage the approximation capabilities of the body-centred cubic lattice, we propose a factor-of-four Cartesian to body-centered downsampling transform. We derive a Fourier domain post-aliasing error kernel and use it to optimize the cosine-weighted trilinear B-spline kernel. We demonstrate that our downsampling transform preserves fidelity when an oversampled function of interest is reconstructed with trilinear interpolation on the fine-scale Cartesian grid, and optimized cosine-weighted trilinear approximation on the coarse-scale body-centered cubic grid.
  • Item
    Improved Sparse Seeding for 3D Electrostatic Field Lines
    (The Eurographics Association, 2015) Scharnowski, Katrin; Boblest, Sebastian; Ertl, Thomas; E. Bertini and J. Kennedy and E. Puppo
    We present an improved seeding strategy for sparse visualization of electrostatic fields. By analyzing the curvature of the field lines, we extract points of extremal field strength between charges of different sign and use them to seed field lines, which consequently connect the corresponding charges. The resulting sparse representation can be seen as an extension to classic vector field topology depicting properties otherwise hidden. Finally, by applying our method to a synthetic data set, we show its benefits over previously published work.
  • Item
    Clustering Moment Invariants to Identify Similarity within 2D Flow Fields
    (The Eurographics Association, 2015) Bujack, Roxana; Kasten, Jens; Natarajan, Vijay; Scheuermann, Gerik; Joy, Kenneth I.; E. Bertini and J. Kennedy and E. Puppo
    Moment invariants have proven to be a useful tool for the detection of patterns in scalar and vector fields. By their means, an interesting feature can be detected in a data set independent of its exact orientation, position, and scale. In this paper, we show that they can also be applied to explore an unknown dataset without prior determination of a query feature pattern it may possibly contain. The clustering of the high dimensional moment space reveals the major structures in the underlying flow field and gives an excellent overview for subsequent more profound exploration.
  • Item
    Dynamic Scheduling for Progressive Large-Scale Visualization
    (The Eurographics Association, 2015) Flatken, Markus; Berres, Anne; Merkel, Jonas; Hotz, Ingrid; Gerndt, Andreas; Hagen, Hans; E. Bertini and J. Kennedy and E. Puppo
    The ever-increasing compute capacity of high-performance systems enables scientists to simulate physical phenomena with a high spatial and temporal accuracy. Thus, the simulation output can yield dataset sizes of many terabytes. An efficient analysis and visualization process becomes very difficult especially for explorative scenarios where users continuously change input parameters. Using a distributed rendering pipeline may relieve the visualization frontend considerably but is often not sufficient. Therefore, we additionally propose a progressive data streaming and rendering approach. The main contribution of our method is the importance-guided order of data processing for block structured datasets. This requires a dynamic scheduling of data chunks on the parallel post-processing system which has been implemented by using an R-Tree. In this paper, we demonstrate the efficiency of our implementation for view-dependent feature extraction with varying viewpoints.
  • Item
    Analyzing the Evolution of the Internet
    (The Eurographics Association, 2015) Johnson, Thienne; Acedo, Carlos; Kobourov, Stephen; Nusrat, Sabrina; E. Bertini and J. Kennedy and E. Puppo
    Existing representations of the Internet do not provide information on why countries have a bigger Internet presence (e.g., Internet Service Providers) than others. In this paper we evaluate four geo-economic parameters (area, population, GDP and GDP per capita), looking for clues of why some areas or countries have developed earlier/ later, faster/slower than others. We use correlation studies to analyze which geo-economic variable leads to bigger development in the Internet infrastructure per continent, and cartograms to represent the growth of the Internet infrastructure around the world, in a sequence of 24 years. These representations make it possible to find interesting patterns and identify outliers.
  • Item
    Ambient Grids: Maintain Context-Awareness via Aggregated Off-Screen Visualization
    (The Eurographics Association, 2015) Jäckle, Dominik; Stoffel, Florian; Kwon, Bum Chul; Sacha, Dominik; Stoffel, Andreas; Keim, Daniel A.; E. Bertini and J. Kennedy and E. Puppo
    When exploring large spatial datasets, zooming and panning interactions often lead to the loss of contextual overview. Existing overview-plus-detail approaches allow users to view context while inspecting details, but they often suffer from distortion or overplotting. In this paper, we present an off-screen visualization method called Ambient Grids that strikes the balance between overview and details by preserving the contextual information as color grids within a designated space around the focal area. In addition, we describe methods to generate Ambient Grids for point data using data aggregation and projection. In a use case, we show the usefulness of our technique in exploring the VAST Challenge 2011 microblog dataset.
  • Item
    OceanPaths: Visualizing Multivariate Oceanography Data
    (The Eurographics Association, 2015) Nobre, Carolina; Lex, Alexander; E. Bertini and J. Kennedy and E. Puppo
    Geographical datasets are ubiquitous in oceanography. While map-based visualizations are useful for many different domains, they can suffer from cluttering and overplotting issues when used for multivariate data sets. As a result, spatial data exploration in oceanography has often been restricted to multiple maps showing various depths or time intervals. This lack of interactive exploration often hinders efforts to expose correlations between properties of oceanographic features, specifically currents. OceanPaths provides powerful interaction and exploration methods for spatial, multivariate oceanography datasets to remedy these situations. Fundamentally, our method allows users to define pathways, typically following currents, along which the variation of the high-dimensional data can be plotted efficiently. We present a case study conducted by domain experts to underscore the usefulness of OceanPaths in uncovering trends and correlations in oceanographic data sets.
  • Item
    Task Taxonomy for Cartograms
    (The Eurographics Association, 2015) Nusrat, Sabrina; Kobourov, Stephen; E. Bertini and J. Kennedy and E. Puppo
    Cartograms are maps in which areas of geographic regions (countries, states) appear in proportion to some variable of interest (population, income). Despite the popularity of cartograms and the large number of cartogram variants, there are few studies evaluating the effectiveness of cartograms in conveying information. In order to design cartograms as a useful visualization tool and to be able to compare the effectiveness of cartograms generated by different methods, we need to study the nature of information conveyed and the specific tasks that can be performed on cartograms. In this paper we consider a set of cartogram visualization tasks, based on standard taxonomies from cartography and information visualization. We then propose a cartogram task taxonomy that can be used to organize not only the tasks considered here but also other tasks that might be added later.
  • Item
    A Testbed Combining Visual Perception Models for Geographic Gaze Contingent Displays
    (The Eurographics Association, 2015) Bektas, Kenan; Cöltekin, Arzu; Krüger, Jens; Duchowski, Andrew T.; E. Bertini and J. Kennedy and E. Puppo
    We present a testbed featuring gaze-contingent displays (GCDs), in which we combined multiple models of the human visual system (HVS) to manage the visual level of detail. GCDs respond to the viewer's gaze in real-time, rendering a space-variant visualization. Our testbed is optimized for testing mathematical models of the human visual perception utilized in GCDs. Specifically, we combined models of contrast sensitivity, color perception and depth of field; and customized our implementation for geographic imagery. In this customization process, similarly to the geographic information systems (GIS), we georeference the input images, add vector layers on demand, and enable stereo viewing. After the implementation, we studied the computational and perceptual benefits of the studied perceptual models in terms of data reduction and user experience in geographic information science (GIScience) domain. Our computational validation experiments and the user study results indicate the HVS-based data reduction solutions are competitive, and encourage further research. We believe the research outcome and the testbed will be relevant in domains where visual interpretation of imagery is a part of professional life; such as in search and rescue, damage assessment in hazards, geographic image interpretation or urban planning.
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    Visualizing Dynamic Brain Networks Using an Animated Dual-Representation
    (The Eurographics Association, 2015) Ma, Chihua; Kenyon, Robert V.; Forbes, Angus G.; Berger-Wolf, Tanya; Slater, Bernard J.; Llano, Daniel A.; E. Bertini and J. Kennedy and E. Puppo
    Dynamic network visualization has been a challenging topic for dynamic networks analysis, especially for spatially embedded networks like brain networks. In this paper, we present an animated interactive visualization design that combines enhanced node-link diagrams and distance matrix layouts to assist neuroscientists in their exploration of dynamic brain networks and that enables them to understand how functional connections relate to the spatial structure of the brain. Our visualization also provides the ability to observe the evolution of a network, the change in the community identities, and node behavior over time.
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    Visual Analytics of Work Behavior Data - Insights on Individual Differences
    (The Eurographics Association, 2015) Koldijk, Saskia; Bernard, Jürgen; Ruppert, Tobias; Kohlhammer, Jörn; Neerincx, Mark; Kraaij, Wessel; E. Bertini and J. Kennedy and E. Puppo
    Stress in working environments is a recent concern. We see potential in collecting sensor data to detect patterns in work behavior with potential danger to well-being. In this paper, we describe how we applied visual analytics to a work behavior dataset, containing information on facial expressions, postures, computer interactions, physiology and subjective experience. The challenge is to interpret this multi-modal low level sensor data. In this work, we alternate between automatic analysis procedures and data visualization. Our aim is twofold: 1) to research the relations of various sensor features with (stress related) mental states, and 2) to develop suitable visualization methods for insight into a large amount of behavioral data. Our most important insight is that people differ a lot in their (stress related) work behavior, which has to be taken into account in the analyses and visualizations.
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    Exploratory Text Analysis using Lexical Episode Plots
    (The Eurographics Association, 2015) Gold, Valentin; Rohrdantz, Christian; El-Assady, Mennatallah; E. Bertini and J. Kennedy and E. Puppo
    In this paper, we present Lexical Episode Plots, a novel automated text-mining and visual analytics approach for exploratory text analysis. In particular, we first describe an algorithm for automatically annotating text regions to examine prominent themes within natural language texts. The algorithm is based on lexical chaining to find spans of text in which the frequency of a term is significantly higher than its average in the document. In a second step we present an interactive visualization supporting the exploration and interpretation of Lexical Episodes. The visualization links higher-level thematic structures with content-level details. The methodological capabilities of our approach are illustrated by analyzing the televised US presidential election debates.
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    PoPI: Glyph Designs for Collaborative Filtering on Interactive Tabletops
    (The Eurographics Association, 2015) Charleer, Sven; Klerkx, Joris; Duval, Erik; E. Bertini and J. Kennedy and E. Puppo
    Filtering data on a visualization can be a challenge when multiple people work on a shared visualization, for instance on an interactive tabletop. Visualizations can present data that satisfy the union of all user filters, or data lenses can provide individual views on parts of the data. To support per-user filters simultaneously across a shared visualization, we explore different glyph approaches that complement data points with per-user filter status information. Adding physical positions of users around the tabletop as an extra attribute to the glyph, we attempt to lower the cognitive load required to map filter statuses to corresponding participants. This work presents the design choices, briefly covers technical development, reports on the evaluation results and points out possibilities for future work.
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    Visual Techniques to Support Exploratory Analysis of Temporal Graph Data
    (The Eurographics Association, 2015) Kerracher, Natalie; Kennedy, Jessie; Chalmers, Kevin; Graham, Martin; E. Bertini and J. Kennedy and E. Puppo
    Recently, much research has focused on developing techniques for the visual representation of temporal graph data. This paper takes a wider look at the visual techniques involved in exploratory analysis of such data, considering the variety of sub tasks and contextual tasks required to understand change in a graph over time, and the visual techniques which are able to support these tasks. In so doing, we highlight a number of tasks which are less well supported by existing techniques, which could prove worthwhile avenues for future research.
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    Visualization-assisted Insights into Home Energy Usage
    (The Eurographics Association, 2015) Law, Matthew; Rollins, Sami; Banerjee, Nilanjan; Joshi, Alark; E. Bertini and J. Kennedy and E. Puppo
    Motivated by both cost savings and environmental concerns, managing energy in the home has become increasingly important. Though both user-driven and automated solutions have shown promise, a deeper understanding of the characteristics of energy usage behavior is necessary to inform the design of such systems. In this work, we present the results of a study that explores the insights and characteristics participants are able to derive using two well-known visualization techniques for time series data. We find that participants are able to extract a variety of relevant features and explain general and anomalous patterns of behavior. We also find that the preferred visualization is both user- and task-dependent. These findings may be used as the basis for new systems for home energy management.
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    Towards Understanding Enjoyment and Flow in Information Visualization
    (The Eurographics Association, 2015) Saket, Bahador; Scheidegger, Carlos; Kobourov, Stephen G.; E. Bertini and J. Kennedy and E. Puppo
    Traditionally, evaluation studies in information visualization have measured effectiveness by assessing performance time and accuracy. More recently, there has been a concerted effort to understand aspects beyond time and errors. In this paper we study enjoyment, which, while arguably not the primary goal of visualization, has been shown to impact performance and memorability. Different models of enjoyment have been proposed in other fields; yet there is no standard approach to evaluate and measure enjoyment in visualization. In this paper we attempt to relate the flow model of Csikszentmihalyi to Munzner's nested model of visualization evaluation and previous work in the area. We suggest that, even though previous papers tackled individual elements of flow, in order to understand what specifically makes a visualization enjoyable, it might be necessary to measure specific elements in particular ways.
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    ColorCAT: Guided Design of Colormaps for Combined Analysis Tasks
    (The Eurographics Association, 2015) Mittelstädt, Sebastian; Jäckle, Dominik; Stoffel, Florian; Keim, Daniel A.; E. Bertini and J. Kennedy and E. Puppo
    Colormap design is challenging because the encoding must match the requirements of data and analysis tasks as well as the perception of the target user. A number of well-known tools exist to support the design of colormaps. ColorBrewer [HB03], for example, is a great resource to select colors for qualitative, sequential, and diverging data. PRAVDAColor [BRT95] and Tominski et al. [TFS08], for example, provide valuable guidelines for single analysis tasks such as localization, identification, and comparison. However, for solving real world problems in most practical applications, single elementary analysis tasks are not sufficient but need to be combined. In this paper, we propose a methodology and tool to design colormaps for combined analysis tasks. We define color mapping requirements and develop a set of design guidelines. The visualization expert is integrated in the design process to incorporate his/her design requirements, which may depend on the application, culture, and aesthetics. Our ColorCAT tool guides novice and expert designers through the creation of colormaps and allows the exploration of the design space of color mapping for combined analysis tasks.
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    Bridging the Gap of Domain and Visualization Experts with a Liaison
    (The Eurographics Association, 2015) Simon, Svenja; Mittelstädt, Sebastian; Keim, Daniel A.; Sedlmair, Michael; E. Bertini and J. Kennedy and E. Puppo
    We introduce the role Liaison for design study projects. With considerable expertise in visualization and the application domain, a Liaison can help to foster richer and more effective interdisciplinary communication in problem characterization, design, and evaluation processes. We characterize this role, provide a list of tasks of Liaison and visualization experts, and discuss concrete benefits and potential limitations based on our experience from multiple design studies. To illustrate our contributions we use as an example a molecular biology design study.
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    Interaction with Uncertainty in Visualisations
    (The Eurographics Association, 2015) Sarkar, Advait; Blackwell, Alan F.; Jamnik, Mateja; Spott, Martin; E. Bertini and J. Kennedy and E. Puppo
    In recent years, a number of algorithms have been developed which provide fast approximate computations on large datasets. There is considerable interest in exploiting these techniques to render interactive visualisations of large datasets. Such interactions require careful consideration of the uncertainty arising from the approximations that these algorithms employ. Characterising and comparing visualisations of uncertainty has been well studied; however, it is typically assumed that uncertainty is a fixed property of the data. In light of this new generation of approximate visualisations, we consider the case where uncertainty arises from algorithms whose parameters can be altered, and so can be manipulated just like any other aspect of the visualisation. We present a novel directmanipulation interface for uncertainty in visualisations and show through a user study that our interface enables people to successfully edit and comprehend uncertainty.
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    Card Sorting Techniques for Domain Characterization in Problem-driven Visualization Research
    (The Eurographics Association, 2015) Sakai, Ryo; Aerts, Jan; E. Bertini and J. Kennedy and E. Puppo
    In a problem-driven visualization research, the domain characterization is fundamental to the design process of a visualization solution to enable insight and discovery. Complex, fuzzy and exploratory analysis tasks in a specialized domain present considerable challenges to the designer, as well as the expert, to establish a shared understanding of the domain problem and analysis needs. In this paper, we provide a three-stage practical guideline for conducting card sorting exercise to address challenges in the domain characterization and a case study from the biological domain.
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    State of the Art in Mobile Volume Rendering on iOS Devices
    (The Eurographics Association, 2015) Schiewe, Alexander; Anstoots, Mario; Krüger, Jens; E. Bertini and J. Kennedy and E. Puppo
    The ubiquity of ever-increasing computing power with mobile devices has put last generation desktop-grade hardware in everyone's palms. Mobile computing hardware is rapidly approaching today's desktop-grade hardware capabilities enabling applications of advanced rendering algorithms to previously untouched environments such as medical care. Recent developments in graphics APIs have introduced novel low-level APIs such as AMD's Mantle API for desktops and Apple's Metal API for mobile hardware. Microsoft's DirectX 12 and the OpenGL successor Vulkan will be available in the near future. AAA game titles were announced for which publishers see an advantage-as promised by the creators of the new APIs-over traditional portable implementations. The new APIs are mostly advertised to allow for more draw-calls per frame compared to for example, OpenGL-based solutions. Visualization algorithms and in particular direct volume rendering do not exhibit a significant amount of draw-calls as a bottleneck. This work evaluates and highlights the utility of recent low-level APIs for mobile devices and puts them into perspective with available alternatives.