... milliseconds for total execution time. is test is an extremely basic, but solid, foundation upon which you can begin to form a strategy for indexing existing spatial data to improve overall performance. Understanding ... index will only be eective for the objects, or shapes, within the bounding box. Not containing objects within a bounding box could severly impact performance and cause mistuning in spatial queries.Furthermore, ... be used with a grid-layer density of Low for the first two layers and then Medium and High for third and fourth layers. is density change allows for tuning the object in the index and the covering...