Linear Measurements (Chain Survey)
Linear Measurements, Procedure in Chain Surveying,Basic Definition of Chain Surveying- Main Station, Tie Station, Main Survey Line, Tie Line/ Subsidiary Line, Base Line, Check Line/ Proof Line, Offset, Chainage, Well Conditioned Triangle. Linear Measurement with Chain- On Smooth Level Ground, On Sloping Ground. Errors & Correction in Chaining/ Taping, Type of Error in Chaining, Correction in Chaining & Taping Are Following Type- Correction For Standardisation, Correction for Slope (Cg), Correction for Pull (Tension), Correction for Temperature (Ct), Correction for Sag (Csag), Reduction of length to mean sea level (MSL), Field Work in Chain Surveying- Reconnaissance, Marking of Stations, Running Survey Lines, Taking Offsets. Limiting Length of Offsets- Error only in laying offset, Error in laying direction and liner measurement.
In trigonometric levelling, we details discuss about trigonometric levelling, determination of elevation of object when its base are accessible & not accessible & when the two instruments are not in the same vertical plane.
In curve we details discuss about curve, type of curve, basic definitions of curve, elements of circular curve, apex distance, chainage of tangent points, intermediate chord length.