A survey document usually includes a detailed drawing of your property, with measurements and other data. Irregular shape lots are particularly challenging, like a pie-shaped section of a cul-du-sac development.
Here’s a not-so-easy to read example:
Do you know the name of the instrument this guy is using?
Table of Surveying, from the 1728 ”Cyclopaedia”, Volume 2. [http://images.library.wisc.edu/HistSciTech/EFacs/Cyclopaedia/Cyclopaedia02/XL/0813.jpg]