Definition
The X-tree (eXtended node tree) (Berchtold et al. 1996) is a spatial access method (Böhm et al. 2001) that supports efficient query processing for high-dimensional data. It supports not only point data but also extended spatial data. The X-tree provides overlap-free split whenever it is possible without allowing the tree to degenerate; otherwise, the X-tree uses extended variable size directory nodes, so-called supernodes. The X-tree may be seen as a hybrid of a linear array-like and a hierarchical R-tree-like directory.
Historical Background
The R-tree (Guttman 1994) and the R*-tree (Beckmann et al. 1990), spatial access methods with a hierarchically structured directory that use minimum bounding rectangles (MBRs) as page regions, have primarily been designed for the management of spatially extended, two-dimensional objects, but have...
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Keim, D., Bustos, B., Berchtold, S., Kriegel, HP. (2017). Indexing, X-Tree. In: Shekhar, S., Xiong, H., Zhou, X. (eds) Encyclopedia of GIS. Springer, Cham. https://doi.org/10.1007/978-3-319-17885-1_620
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DOI: https://doi.org/10.1007/978-3-319-17885-1_620
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