Video-based approaches are rooted in the photogrammetry whose principles were first developed as a means to create maps from aerial photographs.
Photogrammetry has been defined as the process of deriving metric information about an object through measurements made on photographs of the object. Photogrammetry is based on remote sensing and digital image processing. By tracking discrete points in photographs (or frames) taken by cameras with photogrammetic principles, shape, strain, and displacement can be measured. In October 2021, static field tests performed in Brazil, using camera measurements along with a traditional data acquisition system composed of LVDTs and stratin gauges.