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Advanced Data Structures
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  1. Advanced Data Structures Data Structures for Multidimensional Data Jaruloj Chongstitvatana

  2. Outline • What is multidimensional data? • Spatial data e.g. regional map • Multimedia data e.g. pictures, sound clip, movie clip • Why special data structures for multidimensional data? • Spatial data: need the test on spatial extent • High-dimensional data: Curse of dimensionality • Our focus • Dynamic index structures for database queries Jaruloj Chongstitvatana

  3. Outline (cont’d) • Indexing structures for multidimensional point data • Issues for multidimensional point data • Order of search key • Examples of the index structures • k-d-B tree • Point quadtree • Grid file Jaruloj Chongstitvatana

  4. Outline (cont’d) • Indexing structures for spatial data • Issues for spatial data • Spatial queries • Object extent • Transformation: Object mapping • Examples of the index structures • R tree and its variants • Region quadtree • SKD-tree • LSD-tree Jaruloj Chongstitvatana

  5. Outline (cont’d) • Indexing structures for high-dimensional data • Issues for high-dimensional data • Curse of dimensionality • Examples of the index structures • hB-tree • SS-tree • X-tree Jaruloj Chongstitvatana

  6. Evaluation • Midterm exam 35 % • Final exam 35 % • Assignment 30 % Jaruloj Chongstitvatana

  7. References • Gaede, V. and Gunther, O., Multidimensional Access Methods, ACM Computing Surveys, Vol. 30, No. 2, June 1998, pp. 170-230. • Bohm, C., and Bercjtold, S., Searching in Hign-dimensional Spaces – Index Structures for Improving the Performance of Multimedia Databases, ACM Computing Surveys, Vol. 33, No. 3, September 2001, pp. 322-373. • … Jaruloj Chongstitvatana