The purpose of topographical survey is to research into topographic conditions of the study area and to collect appropriate data for design and related work. Drawing the topographic map:

- Scale of 1/200, 1/500, 1/1000, 1/2000, 1/5000
- Setting up benchmarks for surveying
- Co-ordinate and elevation network
- Surveying the cross section, longitudinal section

In addition, a survey for construction work is carried out to serve construction projects in their execution.

- Establishing control network for execution
- Positioning the construction area
- Validating the accuracy of construction work
- Positioning the centre line of construction work
- Positioning the foundation
- Postioning the main axes and auxiliary axes in construction work
- Setting up the coordinate system for construction work
- Monitoring the displacement of construction work (monitoring the settlement, horizontal and vertical movement…)
- ………..