6. The computer-readable storage media of claim 4 , comprising further computer-executable instructions for growing the bounding box by increasing the geographic region defined by the bounding box until either a maximum bounding box size is reached or until a minimum quantity of entities remain after the excluding.
4. The computer-readable storage media of claim 1 , comprising further computer-executable instructions for excluding the derived entities that are geographically located outside of a geographic region defined by a bounding box.