How does the topographic survey work?

Every project has objectives ,as a topographic survey we deal with needs to give the purpose and achieve the targets.u have to measuee and study and after that you apply setting all designs,you follow also these measurements to get a high accurate ones. atriangles and tide points the first thing you start with for any progect. 

yes also we know it as: the technique, profession, and science of accurately determining the terrestrial or three-dimensional position of points and the distances and angles between them.
These points are usually on the surface of the Earth, and they are often used to establish land maps and boundaries for ownership or governmental purposes.

topographic survey is the science and art of making all essential measurements to determine the relative position of points or physical and cultural details above, on, or beneath the surface of the Earth, and to depict them in a usable form, or to establish the position of points or details.