Trigonometric Levelling & Tacheometry

Trigonometric Levelling

Trigonometric Levelling, Determination of elevation of object when its base is accessible, Determination of elevation of object when its base is not accessible, Determination of elevation of the object when the two instruments are not in the same vertical plane.

Tacheometry

Tacheometry, Instrument Used In Tacheometry – Tacheometer, Stadia Rod. Different Systems of Tacheometric Measurement- Stadia System (Fixed hair system, Movable hair system), Tangential System, Subtense Bar System, Theory of Tacheometer, Distance and Elevation Through Tacheometer- When a Staff Is Vertical, & When a Staff Is Perpendicular to Line of Sight.

Topics

Surveying

Compass Surveying (Fore Bearing And Back Bearing, Magnetic Declination, Angle of Dip)

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30 August 2021

Bearing measured from one station to adjacent next station in the direction of traverse is called fore bearing. Back Bearing, Magnetic Declination, Angle of Dip are discussed in detailed.

Surveying

Fundamentals Of Surveying (Part-2)

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4 August 2021

In fundamentals of surveying (part-2), we details analysis about plan & map, scale, representation of scale- engineer’s scale, representation fraction (rf), graphical scale. Shrinkage factor or shrinkage ratio, error due to shrinkage of map, error due to wrong measuring scale, type of scales- plane scale, diagonal scale, vernier scale (direct vernier, retrograde vernier, extended vernier, double vernier).