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UPENDRA KUMAR
March 26, 2020

fig 1. |

Let A and B be the two points whose difference is to be determined.

i. Set the level instrument near A. Complete temporary adjustment and takes reading staff A and B. Write the reading like as a1 and b1. shown in fig. 1

fig 2. |

ii Transfer the instrument to B and set up near to B. Make a temporary adjustment. Take the staff reading as a2 and b2.

d= the true difference of level between A and B.

e= the total error due to curvature, refraction, and imperfect collimation adjustment.

The correct staff reading in fig.1= b1-e.

The correct staff reading in fig.2= a2-e.

In the fig.1 the true difference of level between A and B (true fall from A to B)

d= (b1-e)-a1

or d= (b1-a1)-e ....................................equation F

In the fig.2 the true difference of level between A and B (true fall from A to B)

d= b2-(a2-e) or

(b2-a2) +e ............................................equation G

Adding the equation Fand G to eliminate e, we get

d= (b1-a1)+(b2-a2)/2

Two values gives the true difference of elevation between two points free from all errors, like error due to curvature of the earth, refraction error and error of collimation error.

SEE ALSO:-https://www.technoupendra.com/2020/03/how-to-create-3d-surface-into-auto-cad.html

https://www.technoupendra.com.

https://www.technoupendra.com.

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