Then in next step RL (reduced level) of each station is determined with reference to permanent benchmark (the instruments used to determine reduced level include Auto Level with stand and Levelling Staff). Then RL of different points keeping specified spacing between them with reference to each station is determined. The points having same RL are joined to form contour lines and thus a topographic map of an area is prepared using AutoCAD or with the help of plane table survey. Results In Survey camp, students obtain extensive hands-on experience in the use of land surveying instruments and in the essentials of survey practice. Measurements of distances and angles, calculation and correction of errors are introduced. Concepts of higher order surveys and satellite navigation are reviewed and illustrated. Thus students learn surveying practically, this gives them confidence to work (with good precision and accuracy) in Industrial fields in the future. See also Tape (surveying) Tape correction (surveying) Permanent adjustments of theodolites Temporary adjustments of theodolites References Surveying Civil engineering Career and technical education