It is an art of determining the relative positions of point on earth surface.Take any type of Civil Engineering Project the first step in designing a project involves surveying, because the land surface which you use for construction may not be a level surface.
To make that particular land surface into a level one or to have a certain gradient,the application of surveying is used.,to know which section has to be cutted and filled. By means of using surveying we can accurately calculate the quantity of earth work to be filled and cutted.(particular project may be a road or a building work) The other side is measuring the land area which is used for construction.
Total station is one advanced electronic instrument using which we can take horizontal angle,vertical angle ,area,height and width of a structure very accurately.Its one instrument which has the application of many old surveying instrument, also the data which you take in surveying can be transfer-ed to computer and the profile of land can be projected.