Curvature and Refraction correction in Levelling | Animated Explanation

Описание к видео Curvature and Refraction correction in Levelling | Animated Explanation

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This video explains curvature and refraction correction to be accounted while performing levelling at longer distance. The curvature effect is insignificant at shorter distance. Refraction effect is due to change in velocities of light when it travels through air of different densities.
For height of instrument method watch:
   • Height of instrument method introduction  

For problem solved on levelling using Height of instrument see:
   • How to calculate RL using Height of i...  
Music: www.bensound.com

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