Wouter Meulemans
YOU?
Author Swipe
View article: Summarizing Classed Region Maps with a Disk Choreme
Summarizing Classed Region Maps with a Disk Choreme Open
Chorematic diagrams are highly reduced schematic maps of geospatial data and processes. They can visually summarize complex situations using only a few simple shapes (choremes) placed upon a simplified base map. Due to the extreme reductio…
View article: StorySets: Ordering Curves and Dimensions for Visualizing Uncertain Sets and Multi-Dimensional Discrete Data
StorySets: Ordering Curves and Dimensions for Visualizing Uncertain Sets and Multi-Dimensional Discrete Data Open
We propose a method for visualizing uncertain set systems, which differs from previous set visualization approaches that are based on certainty (an element either belongs to a set or not). Our method is inspired by storyline visualizations…
View article: Visual Complexity of Point Set Mappings
Visual Complexity of Point Set Mappings Open
We study the visual complexity of animated transitions between point sets. Although there exist many metrics for point set similarity, these metrics are not adequate for this purpose, as they typically treat each point separately. Instead,…
View article: Visual Complexity of Point Set Mappings
Visual Complexity of Point Set Mappings Open
We study the visual complexity of animated transitions between point sets. Although there exist many metrics for point set similarity, these metrics are not adequate for this purpose, as they typically treat each point separately. Instead,…
View article: SimpleSets: Capturing Categorical Point Patterns with Simple Shapes
SimpleSets: Capturing Categorical Point Patterns with Simple Shapes Open
Points of interest on a map such as restaurants, hotels, or subway stations, give rise to categorical point data: data that have a fixed location and one or more categorical attributes. Consequently, recent years have seen various set visu…
View article: SimpleSets: Capturing Categorical Point Patterns with Simple Shapes
SimpleSets: Capturing Categorical Point Patterns with Simple Shapes Open
Points of interest on a map such as restaurants, hotels, or subway stations, give rise to categorical point data: data that have a fixed location and one or more categorical attributes. Consequently, recent years have seen various set visu…
View article: Contextual Matrix Orderings for Graph Collections
Contextual Matrix Orderings for Graph Collections Open
Visualizing a graph directly via its adjacency matrix is a common and effective technique. Such matrix visualizations rely crucially on a good ordering of the vertices to highlight intrinsic patterns in the graph. When analyzing collection…
View article: Greedy Monochromatic Island Partitions
Greedy Monochromatic Island Partitions Open
Constructing partitions of colored points is a well-studied problem in discrete and computational geometry. We study the problem of creating a minimum-cardinality partition into monochromatic islands. Our input is a set $S$ of $n$ points i…
View article: Optimizing Symbol Visibility through Displacement
Optimizing Symbol Visibility through Displacement Open
In information visualization, the position of symbols often encodes associated data values. When visualizing data elements with both a numerical and a categorical dimension, positioning in the categorical axis admits some flexibility. This…
View article: Graph Drawing Contest Report
Graph Drawing Contest Report Open
This report describes the 29th Annual Graph Drawing Contest, held in conjunction with the 30th International Symposium on Graph Drawing and Network Visualization (GD’22) in Tokyo, Japan. Due to the continuing global COVID-19 pandemic, the …
View article: Physically consistent map matching
Physically consistent map matching Open
An important data source for traffic analysis is GPS trajectory data. However, due to measurement inaccuracies, such data does not necessarily align well with data describing the road network. Hence, GPS data typically needs to be aligned …
View article: Computing Schematic Layouts for Spatial Hypergraphs on Concentric Circles and Grids
Computing Schematic Layouts for Spatial Hypergraphs on Concentric Circles and Grids Open
Set systems can be visualized in various ways. An important distinction between techniques is whether the elements have a spatial location that is to be used for the visualization; for example, the elements are cities on a map. Strictly ad…
View article: Route Reconstruction from Traffic Flow via Representative Trajectories
Route Reconstruction from Traffic Flow via Representative Trajectories Open
Understanding human mobility is an important aspect of traffic analysis and urban planning. Trajectories provide detailed views on specific routes, but typically do not capture all traffic. Loop detectors capture all traffic flow at specif…
View article: Near-Delaunay Metrics
Near-Delaunay Metrics Open
We study metrics that assess how close a triangulation is to being a Delaunay triangulation, for use in contexts where a good triangulation is desired but constraints (e.g., maximum degree) prevent the use of the Delaunay triangulation its…
View article: Maximum Physically Consistent Trajectories
Maximum Physically Consistent Trajectories Open
Trajectories are usually collected with physical sensors, which are prone to errors and cause outliers in the data. We aim to identify such outliers via the physical properties of the tracked entity, that is, we consider its physical possi…
View article: Obstructing Classification via Projection
Obstructing Classification via Projection Open
Machine learning and data mining techniques are effective tools to classify large amounts of data. But they tend to preserve any inherent bias in the data, for example, with regards to gender or race. Removing such bias from data or the le…
View article: Stable Visual Summaries for Trajectory Collections
Stable Visual Summaries for Trajectory Collections Open
The availability of devices that track moving objects has led to an explosive growth in trajectory data. When exploring the resulting large trajectory collections, visual summaries are a useful tool to identify time intervals of interest. …
View article: Topological stability of kinetic k-centers
Topological stability of kinetic k-centers Open
View article: Convex polygons in cartesian products
Convex polygons in cartesian products Open
We study several problems concerning convex polygons whose vertices lie in a Cartesian product of two sets of $n$ real numbers (for short, \emph{grid}). First, we prove that every such grid contains $\Omega(\log n)$ points in convex positi…
View article: Coordinated Schematization for Visualizing Mobility Patterns on Networks
Coordinated Schematization for Visualizing Mobility Patterns on Networks Open
GPS trajectories of vehicles moving on a road network are a valuable source of traffic information. However, the sheer volume of available data makes it challenging to identify and visualize salient patterns. Meaningful visual summaries of…
View article: Harmonious Simplification of Isolines
Harmonious Simplification of Isolines Open
Current techniques for simplification focus on reducing complexity while maintaining the geometric similarity to the input. For isolines that jointly describe a scalar field, however, we postulate that geometric similarity of each isoline …
View article: Obstructing Classification via Projection
Obstructing Classification via Projection Open
Machine learning and data mining techniques are effective tools to classify large amounts of data. But they tend to preserve any inherent bias in the data, for example, with regards to gender or race. Removing such bias from data or the le…
View article: Graph Drawing Contest Report
Graph Drawing Contest Report Open
This report describes the 28th Annual Graph Drawing Contest, held in conjunction with the 29th International Symposium on Graph Drawing and Network Visualization (GD’21) in Tübingen, Germany. Due to the global COVID-19 pandemic, the confer…
View article: A Simple Pipeline for Coherent Grid Maps
A Simple Pipeline for Coherent Grid Maps Open
Grid maps are spatial arrangements of simple tiles (often squares or hexagons), each of which represents a spatial element. They are an established, effective way to show complex data per spatial element, using visual encodings within each…
View article: Vulnerability in Social Epistemic Networks
Vulnerability in Social Epistemic Networks Open
Social epistemologists should be well-equipped to explain and evaluate the growing vulnerabilities associated with filter bubbles, echo chambers, and group polarization in social media. However, almost all social epistemology has been buil…
View article: Uncertainty Treemaps
Uncertainty Treemaps Open
Rectangular treemaps visualize hierarchical numerical data by recursively partitioning an input rectangle into smaller rectangles whose areas match the data. Numerical data often has uncertainty associated with it. To visualize uncertainty…
View article: Stable Visual Summaries for Trajectory Collections
Stable Visual Summaries for Trajectory Collections Open
The availability of devices that track moving objects has led to an explosive growth in trajectory data. When exploring the resulting large trajectory collections, visual summaries are a useful tool to identify time intervals of interest. …
View article: Spatially and temporally coherent visual summaries
Spatially and temporally coherent visual summaries Open
When exploring large time-varying data sets, visual summaries are a useful tool to identify time intervals of interest for further consideration. A typical approach is to represent the data elements at each time step in a compact one-dimen…
View article: Maximum Physically Consistent Trajectories
Maximum Physically Consistent Trajectories Open
Trajectories are usually collected with physical sensors, which are prone to errors and cause outliers in the data. We aim to identify such outliers via the physical properties of the tracked entity, that is, we consider its physical possi…
View article: Understanding Movement in Context with Heterogeneous Data
Understanding Movement in Context with Heterogeneous Data Open
Movement data, as captured by myriad sensors, has been growing exponentially. Hence, multidisciplinary approaches for analyzing movement has become feasible. Though, movement pertains to a large variety of domains and applications, the foc…