Larger values mean shallower trees, less memory usage, but worse performance. The value of this ivar may change each time the locator is built. Set the maximum allowable level for the tree. Frees memory and resets object as appropriate. Construct the scalar tree from the dataset provided.
Checks build times and modified time from input and reconstructs the tree if necessaery.
Returned cells will have scalar values that span the scalar value specified. Return the next cell that may contain scalar value specified to initialize traversal. The value NULL is returned if the list is exhausted.