Silhouette-Based Label Placement in Interactive 3D Maps
Silhouette-Based Label Placement in Interactive 3D Maps
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DOI：
10.1007/978-3-642-32618-9_13
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发表时间：
2014
影响因子：
5.7
通讯作者：
Christine Lehmann;J. Döllner
中科院分区：
文献类型：
--
作者：
Christine Lehmann;J. Döllner
This paper presents a silhouette-based technique for automated, dynamic label placement for objects of 2D and 3D maps. The technique uses visibility detection and analysis to localise unobstructed areas and sihouettes of labeled objects in the viewplane. For each labeled object, visible silhouette points are computed and approximated as a 2D polygon; the associated label is finally rotated and placed along an edge of the polygon in a way that sufficient text legibility is maintained. The technique reduces occlusions of geospatial information and map elements caused by labels, while labels are placed close to labeled objects to avoid time-consuming matching between legend and map view. It ensures full text legibility and unambiguity of label assignments by using actually visible 2D silhouette of objects for label placement. We demonstrate the applicability of our approach by examples of 3D map label placement.
