It’s the fixed reference point of known elevation. It’s the staff reading taken on the point of unknown elevation between the back sight and the foresight.For example, if point B is to be determined, then staff reading taken on station B is called as foresight.It’s the staff reading taken on a point whose elevation is yet to be determined.It’s the staff reading taken on a point of known elevation.It’s the line joining the optical centre of objective lens t the points of intersection of crosshairs.A line lying on the level surface is called a level line.A level surface is a curved surface in which all the points are at the same distance from the earth’s surface.It’s a datum obtained by taking the average of hourly high and low tides elevations over a long period of time of about 19 years.The elevation is in positive when the considered point is above datum and negative when the considered point is below datum.It is the vertical distance from a reference surface called a datum.It is used in surveying to establish the elevation of a point relative to a datum or to establish a point at a given elevation relative to a datum.Īlso, Read: What is Chain Surveying (Principles, Procedure, Method, Instrument) Important Terms Related to Levelling Levelling is a process of determining the height of one level relative to another. It helps surveyors and engineers to level, design, plan, and construct a building by making the land suitable for construction What Is Survey Levelling? It can also be defined as a method to find out the difference of elevations of different points on the earth’s surface. Survey leveling is the method by which we measure the elevation of one land with respect to others. Difference Between Surveying and Levelling.Error Occurs Due to Imperfect Focussing.Error Due to Curvature of Earth and Refraction.Error Occurs Due to Temperature Variation Error Due to Curvature of Earth and Refraction IS 516:1959 Most Important Point (Method of Tests For Strength of Concrete).Calculator for Cutting Length of Stirrups.House Construction Cost Calculator Excel Sheet For Ground Floor(G.F.), G.F.+1, G.F.+2, G.F.+3,.House Construction Cost Calculator Excel Sheet.Building Estimation Step by Step In Excel Sheet.
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