What is land surveying and why is it necessary ?

Surveying or land surveying is the technique, profession, and science of accurately determining the terrestrial or three-dimensional position of points and the distances and angles between them, commonly practiced by surveyors, and members of various engineering professions.

Land surveys are critical in the building and development of various construction projects. It is carried out at the early stages of the building process to assess boundaries for properties (commercial or residential), topography for engineering designs and outline elevations for flood insurance for home sites. Moreover, they can be utilized for real estate transactions, subdivisions and other construction projects for a given area or assigning government measurements to public land.