“Drawn to scale” means that you can discover how long or wide or high something is just by using a special ruler laid on the drawing and reading the measurement. This tech goes back thousands of years.
Professional-grade digital scanners produce virtual models that produce the same utility, but are in 3D instead of 2D.
It can take several person-days to measure out a property, especially if they are doing the grounds as well, where nothing is square or straight.
Scanners take only hours, and produce FAR more accurate AND scalable 3D models. Scales can be easily adjusted to fit the required output for the Owner, Architect, Builder, or Municipality. Because, you know, computers.