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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Two Map Labeling Algorithms for GIS Applications
verfasst von : Marina L. Gavrilova
Erschienen in: Computational Science and Its Applications - ICCSA 2006
Verlag: Springer Berlin Heidelberg
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Driven by the industrial challenge of labeling maps for GIS applications, we investigate the problem of computing the largest convex partitioning of the map
P
such that the rectangular axis-parallel label
L
can be placed in it. The map region to be labeled is in general non-convex and may contain holes. Our main result is the new polygonal area removal (PAR) algorithm to identify the area within
P
where the center of the label
L
can be placed. We then derive a new and faster algorithm based on the sweep technique that determines the complete set of maximum inscribed rectangles (MIR) in
P
in the most common case when rectangle sides have an axis-parallel orientation. The set of all maximum inscribed rectangles is then post-processed to produce the best size/orientation combination of the final label placement depending on the specific requirements from the end users.