The process of using a contact probe to measure a feature is termed "taking a hit". In PC-DMIS Vision’s case, the hit refers to the actual position of the point in the measurement process. It is inaccurate to use this same terminology for vision measurements. In PC-DMIS Vision, you click on the image in the Vision tab to relay "hits" to the machine.
The term "Target Anchor Point" better defines the process as it occurs inside PC-DMIS Vision. The points derived from these clicks are used as a reference to calculate the nominal form of the feature.