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Question

In plane table surveying, Lehmann's rule are associated with:

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A.

Solution of all type of resection problems

B.

Method of resection after orientation by compass

C.

Method of resection by two-point problem 

D.

Method of resection by three-point problem

Answer ( Option D)

Method of resection by three-point problem

Solution

Lehmann's method 

•  Locating the position of a plane table station with reference to three point is known as three-point problem. 

•  The trial and error method of three-point problem also known as Lehmann's method. 

•  The accuracy with which a plane table station can be located through three-point problem is known as its fix.

•  In plane tabling failure of fix occurs when the plane table is on the great circle.

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