This disclosure provides methods and systems for form a trajectory of a moving vehicle captured with an image capturing device. The thrust generator has a rotation axis, a plurality of tops arranged symmetrically around the rotation axis, and a motor device for rotating the tops around the rotation axis. Once the BCD is established, the vertexes of the BCD may be traversed to determine whether their constraints are met. The second load balancing device is configured to convert the first type network request to a second type network request, and to transmit the second type network request after the source address and destination address translation to one of the plurality of servers with a second scheduling strategy.