A system and method controls injection of a reductant agent in a selective catalytic reduction system. The method includes positioning a part having a part axis relative to a measurement axis at the part inspection station and scanning the positioned part with an array of planes of radiation so that the part occludes each of the planes of radiation over a measurement interval of the part to create a corresponding array of unobstructed planar portions of the planes of radiation. Here, the DAI information includes at least one DAI value, in which varying combinations of the number of downlink control channels and the priority value are overlapped and mapped. A label may then be generated representing a first measurement parameter observed from ones of the plural cellular sites at one of the selected geographic locations, the label including a relative ranking by cellular site of the first measurement parameter.