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July 01, 1999

Space-Filling Curves in Geospatial Applications

(Page 2 of 8)
Jul99: Algorithm Alley 


(a) 
SELECT * FROM homes WHERE
  price > 140000 AND price < 150000

(b)
SELECT * FROM homes WHERE
  longitude > 122.3 AND longitude < 122.4
  AND latitude > 37.5 AND latitude < 37.6

Example 1: Two queries. (a) One-dimensional query handled efficiently by B-tree; (b) two-dimensional query is less efficient.

Copyright © 1999, Dr. Dobb's Journal
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