Disk based hashes is a method to create multidimensional binary trees on disk.
This library permits the extension of database concept to a plethora of 
electronic data, such as graphic information. With the multidimensional binary 
tree it is possible to mathematically prove that access time to any 
particular record is minimized (using the concept of critical points from 
calculus), which provides the means to construct optimized databases for 
particular applications. An example of the use of this library can be found
at http://itzamna.imp.mx/supermapa, where a 1.8 Gb database of maps of 
Mexico has been made available to the public, acumulating over 800K hits per
month (frames and javascript enabled browser, like netscape or ie, is required
to view the maps).
