The reading is conducted on the spot levels of a group of contour lines laid all over the selected area. Unlike the direct method, the staff survey reading is not done on the contour lines. Indirect method of conducting a contour survey One must only use this method when the plotting area is smaller in size. This method does take up a lot of time before it is completed, but the results are always accurate. 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 Contour gradient– It is defined as a line that holds a constant disposition to the horizontal elevation.There could be a difference in distances between contours as they depend on the alternate height and steepness between any slopes and elevations on the land. Horizontal interval– The parallel distance between two contour lines that run side by side is a horizontal interval.The distance is always constant between any two contours. Contour interval– It is the continuous perpendicular distance between any two ongoing contour lines in a contour map.The lines that are traced in a contour map which joins all the elevated points are called ‘contour lines.’ This map with a clear illustration of contour lines in a valley, hill or ridge is called a ‘contour map.’ The contour maps provide the builders with the correct idea of the elevation of the land, how steep it is and the shape of the slopes. When builders survey land, they are needed to draw a topographic map showing these contour lines.
The process of tracing these contour lines is called ‘contouring.’ It is a fully detailed survey conducted to understand the grooves and ridges of any existing land and understand their differences from other sections of the land. The term contour in construction means locating all the elevations in a horizontal land by connecting them with an imaginary line in a map.
When does a builder conduct contouring?.What are the main pieces of equipment used to conduct a contour survey?.Indirect method of conducting a contour survey.Direct method of conducting a contour survey.Contour: Methods used to conduct contour survey.meanings of contour roll forming will be translated. Input a term contour roll forming by either copy & post, drag & drop, or simply by typing in the search box.
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