What is engineering survey?

civil engineering surveying or technical surveying are kind of the same

it's about sizing your property and calculating it's area

moreover u limit the land by point around the contour to know its boundaries and other than this, u can add altitude on your map using the total statiion machine used in surveying

even in excavating and a lot of stuff, a civil engineering job always starts off by a surveying job to limit the point and write the altitudes and state where to excavate and where not to...

Addendum:

Civil Engineering involves the design and construction of large-scale engineering projects: Dams, Bridges, Tunnels, Buildings etc

Surveyors use specialised equipment and techniques to measure the position of things and/or "set-out" where things should go.

Civil Engineering Surveyors are involved in checking that the structure is in the correct place as designed and built to the tolerances required.