| http://www.w3.org/ns/prov#value | - At each moment in time described by a track, a color, such as colors of a gray scale, may be generated to describe the distance with an x-coordinate, a y-coordinate, and/or a z-coordinate, demarked X, Y, and Z. Further, as shown in FIG. 3B, the speed and direction of the first object may be described in vector components Vx, Vy and Vz.
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