What do numbers mean in digital photogrammetry?

The need of counting and measurement in production practice first produces natural numbers (positive integers), and then gradually produces fractions, zeros, irrational numbers, negative numbers, imaginary numbers and so on.

The development of digital photogrammetry stems from the practice of photogrammetry automation, that is, using related technologies to realize real automatic mapping.

Digital photogrammetry refers to a measurement method based on the basic principle of photogrammetry, which uses computer technology to extract the geometric and physical information digitally expressed by the photographed object.