{TAIL ~ The preferred embodiment} of the present invention advantageously improves the technique of determining {HEAD ~ a grid index} that is used to locate a geometric shape in a spatial database 
{ TAIL ~ The preferred embodiment } of the present invention advantageously improves the technique of determining { HEAD ~ a grid index } that is used to locate a geometric shape in a spatial database
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH