Hyperorthogonal well-folded Hilbert curves

A. Bos, H.J. Haverkort

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R-trees can be used to store and query sets of point data in two or more dimensions. An easy way to construct and maintain R-trees for two-dimensional points, due to Kamel and Faloutsos, is to keep the points in the order in which they appear along the Hilbert curve. The R-tree will then store bounding boxes of points along contiguous sections of the curve, and the efficiency of the R-tree depends on the size of the bounding boxes - smaller is better. Since there are many different ways to generalize the Hilbert curve to higher dimensions, this raises the question which generalization results in the smallest bounding boxes. Familiar methods, such as the one by Butz, can result in curve sections whose bounding boxes are a factor Omega(2^{d/2}) larger than the volume traversed by that section of the curve. Most of the volume bounded by such bounding boxes would not contain any data points. In this paper we present a new way of generalizing Hilbert's curve to higher dimensions, which results in much tighter bounding boxes: they have at most 4 times the volume of the part of the curve covered, independent of the number of dimensions. Moreover, we prove that a factor 4 is asymptotically optimal.
Original languageEnglish
Title of host publication31st International Symposium on Computational Geometry: SoCG 2015
PublisherSchloss Dagstuhl - Leibniz-Zentrum für Informatik
ISBN (Print)978-3-939897-83-5
Publication statusPublished - 2015
Event31st International Symposium on Computational Geometry (SoCG 2015) - Eindhoven, Netherlands
Duration: 22 Jun 201525 Jun 2015
Conference number: 31


Workshop31st International Symposium on Computational Geometry (SoCG 2015)
Abbreviated titleSoCG 2015
Internet address


  • space-filling curve, Hilbert curve, multi-dimensional, range query, R-tree


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