[Problem] To obtain high measurement accuracy in aerial photogrammetry while reducing the cost of installing a measurement target.[Solution] According to the present invention, a launching pad 220 for an unmanned aircraft on which a UAV 200 is installed before take off is provided with: a target indication that constitutes a target locating point used for aerial photogrammetry; and position determining units 221, 222 that determine the position of the UAV 200 with respect to the launching pad 220 in a state in which the position of the UAV 200 with respect to the target indication 224 before take off is specified.