A hinge for circumrotatory location includes a base, a locating gasket defining a pair of recesses thereon, a top cover defining a third groove in a bottom thereof. The base can be releasably mountable upon a load bar of a carrying vehicle. The coding device has a coding section for coding the plurality of pixel data in the order decided by the evaluation section. The ruler enables users to measure the length of the cutting portion of a window shade. The host clouds can comprise clouds based in different time zones, so that cloud capacity during U.