Evaluation of Labeling Strategies for Rotating Maps
We consider the following problem of labeling points in a dynamic map that allows rotation. We are given a set of points in the plane labeled by a set of mutually disjoint labels, where each label is an axis-aligned rectangle attached with one corner to its respective point. We require that each label remains horizontally aligned during the map rotation and our goal is to find a set of mutually non-overlapping active labels for every rotation angle α ∈ [0,2π) so that the number of active labels over a full map rotation of 2π is maximized.
We discuss and experimentally evaluate several labeling models that define additional consistency constraints on label activities in order to reduce flickering effects during monotone map rotation. We introduce three heuristic algorithms and compare them experimentally to an existing approximation algorithm and exact solutions obtained from an integer linear program. Our results show that on the one hand low flickering can be achieved at the expense of only a small reduction in the objective value, and that on the other hand the proposed heuristics achieve a high labeling quality significantly faster than the other methods.
Unable to display preview. Download preview PDF.
- 6.Formann, M., Wagner, F.: A packing problem with applications to lettering of maps. In: Proc. 7th Ann. ACM Symp. Comput. Geom., pp. 281–288. ACM, New York (1991)Google Scholar
- 9.Gemsa, A., Nöllenburg, M., Rutter, I.: Evaluation of Labeling Strategies for Rotating Maps. CoRR, abs/1404.1849 (2014)Google Scholar
- 11.Nöllenburg, M., Polishchuk, V., Sysikaski, M.: Dynamic one-sided boundary labeling. In: Proc. 18th ACM SIGSPATIAL GIS, pp. 310–319. ACM, New York (2010)Google Scholar
- 12.Ooms, K., Kellens, W., Fack, V.: Dynamic map labeling for users. In: Proc. 24th Internat. Cartographic Conf., pp. 1–12. Military Geographic Institute, Santiago (2009)Google Scholar
- 14.Vaaraniemi, M., Treib, M., Westermann, R.: Temporally coherent real-time labeling of dynamic scenes. In: Proc. 3rd Internat. Conf. Computing for Geospatial Research and Applications, pp. 17:1–17:10. ACM, New York (2012)Google Scholar
- 15.Yokosuka, Y., Imai, K.: Polynomial time algorithms for label size maximization on rotating maps. In: Proc. 25th Canadian Conf. Comput. Geom., University of Waterloo, Waterloo, pp. 187–192 (2013)Google Scholar