An object of the present invention is to make it possible to specify a background image area, a moving object image area, and an image area in which the mixture of the background image area and the moving object image area occurs. After writing information on the IC chip, reading test is applied, so as to separate non-defective ID tags and defective ID tags. In an exemplary embodiment, the vehicle is an unmanned aerial vehicle. In an exemplary embodiment, the conductive material is a multi-ply nylon fabric plated with silver by an autocatalytic electroless plating process and with the plies in electrical continuity. From these two measuring signals the desired material properties are determined.