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