ClusterSets: Optimizing Planar Clusters in Categorical Point Data. (29th June 2021)

• Record Type: Journal Article
• Authors: Geiger, J.; Cornelsen, S.; Haunert, J.‐H.; Kindermann, P.; Mchedlidze, T.; Nöllenburg, M.; Okamoto, Y.; Wolff, A.
• Is Part Of: Computer graphics forum. Volume 40:Number 3(2021)
• Page Start: 471
• Page End: 481
• Publication Date: 2021-06-29
• Subjects: Computer graphics -- Periodicals; 006.605
• DOI: 10.1111/cgf.14322
• Languages: English
• ISSNs: 0167-7055

Abstract

Abstract: In geographic data analysis, one is often given point data of different categories (such as facilities of a university categorized by department). Drawing upon recent research on set visualization, we want to visualize category membership by connecting points of the same category with visual links. Existing approaches that follow this path usually insist on connecting all members of a category, which may lead to many crossings and visual clutter. We propose an approach that avoids crossings between connections of different categories completely. Instead of connecting all data points of the same category, we subdivide categories into smaller, local clusters where needed. We do a case study comparing the legibility of drawings produced by our approach and those by existing approaches. In our problem formulation, we are additionally given a graph G on the data points whose edges express some sort of proximity. Our aim is to find a subgraph G′ of G with the following properties: (i) edges connect only data points of the same category, (ii) no two edges cross, and (iii) the number of connected components (clusters) is minimized. We then visualize the clusters in G′. For arbitrary graphs, the resulting optimization problem, Cluster Minimization, is NP‐hard (even to approximate). Therefore, we introduce two heuristics. We do an extensive benchmark test on real‐world data. Comparisons with exact solutions indicate that our heuristics do astonishing well for certain relative‐neighborhood graphs.