1. A method of measuring a location of a physical feature on a test article; said method comprising: supporting a test article to be imaged; interposing a fiducial plate bearing a fiducial between said test article and an imaging device such that there exists a space between the fiducial plate and the test article; imaging a feature of said test article and said fiducial; and based on the imaging, calculating a true location in three-dimensional space of said feature.