Levelling staffs are made of wood, metal or glass fibre and graduated in metres and decimals. The alternate metre lengths are in black and red on a white background. The majority of staffs are telescopic or socketed in three sections for easy carrying. Although the graduations can take various forms, the type adopted in the UK is the […]

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Levelling is the most widely used method of obtaining the elevations of ground points relative to a reference datum and is usually carried out as a separate procedure to those used in fixing planimetric position. The basic concept of levelling involves the measurement of vertical distance relative to a horizontal line of sight. Hence it […]

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