write 400-500 words explaining the procedure of the measurement that we have taken to do the drawing in CAD

i will send to you a CAD drawing, and all you have to do is to write 400-500 words explaining the procedure of the measurement that we have taken to do the drawing, also what things we have used and what things we have faced while measuring the area like trees and the weather changes. And i will send to you a past writing it will help you to understand what exactly i want.