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