This way they note down many contour lines with points on them.įor the direct method, the plane table survey is best suited, which is a faster method of noting down the field monitoring and plotting together. Then again, the staff reading man is made to find another point with the same readings, and they repeat this process. The surveyor then sets the horizontal elevated control of the surveyed point by using his set of instruments. The person handling the staff reading instrument is then made to move to and fro in the area until accurate readings are noted down. Then the necessary staff reading for the selected contour line is calculated. Once a top fly shot of the selected area is conducted from a place nearer to the selected benchmark, a level can be set on the required position. One must use a vertical levelling instrument to conduct the survey in a direct method. This method requires one to pinpoint all the perpendicular and straight controls of the main points that lay on the chosen contour lines. There are mainly two methods a builder must follow to conduct a proper contour survey: Direct method of conducting a contour survey The instrument named ‘Clinometer’ is used to study the contour gradient.Ĭontour: Methods used to conduct contour survey
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