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# New To Surveying - Understanding How Face 1 and Face 2 Value Are Observed

## New To Surveying - Understanding How Face 1 and Face 2 Value Are Observed

(OP)
Hello all

I have trying to learn how to survey. I am not an engineer or work in surveying however I have access to a Trimble S8 Total station and i am trying to learn how to use it off my own back.

I was wondering if anyone out there in the community could explain how Face 1 and Face 2 angles are observed using a total station or theodolite for that matter.

Below/attached is a diagram of how I think face 1 and face 2 observations are recorded.

The picture on the left is an angle measured to target 1 in the forward face (face 1), in this case it measures 60 Degrees - I am happy with this.

The picture on the right shows the telescope reversed, so the instrument is now in the reverse face, face 2 (Blue line). The angle the instrument reads is still 60 degrees, but is now read from the opposite side of the circle. The instrument then sights back to target 1 (clockwise) but continues to increment the angle from 60 degrees so the face 2 angle would be 240 degrees.

Similarly if the face 1 angle read 330 degrees to target 1, then by reversing the telescope 180 degrees and then sighting back to target 1 the angle would still increment from 330 degrees by 180 degrees giving a face 2 angle of 510 degrees. But any angle greater then 360 would have 360 subtracted from it so the actual face 2 angle would read 510 - 360 = 150 degrees.

Have I nailed it or shall I get my head examined?

Can someone confirm?

Thank you.

### RE: New To Surveying - Understanding How Face 1 and Face 2 Value Are Observed

I don't get involved with total station but you made your correct answer of 150 degrees too complicated to get. My approach: 330-180=150 degrees.

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