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Azhar Shahzad

Measurement of vertical angle with Theodolite including example

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Vertical angle

It is the angle in the vertical plane between horizontal line passing through the intersection of cross hairs and inclined line joining intersection of cross hairs and the point being observed.

Circle reading in case of vertical angle

During Face left vertical angle will be computed in the following manner,

  • When angle of elevation, vertical angle = 90° - Circle reading.
  • When angle of depression, vertical angle = Circle reading - 90°.

post-1-0-58326100-1426529895_thumb.jpg

Now, during Face right vertical angle will be computed in th following manner,

  • When angle of elevation, vertical angle = Circle reading - 270°.
  • When angle of depression, vertical angle = 270° - Circle reading.

post-1-0-31191100-1426529912_thumb.jpg

Example for method of booking

Angle Face Circle reading(° ′ ″) Angle value(° ′ ″) Mean(° ′ ″) Remarks
* L 69 58 30 20 01 30 20 01 45(+ve) Elevation
  R 290 02 00 20 02 00

In case of angle of elevation value of vertical angle will be +ve while in case of depression it will be -ve.

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