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Thread: Surveying - Understanding How Face 1 and Face 2 Value Are Observed

  1. #1

    Surveying - Understanding How Face 1 and Face 2 Value Are Observed

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

    Is This Correct.jpg

    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.

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

    Can someone confirm?

    Thank you.

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    Here's a couple of training videos on the use of a Surveying Theodolite.

    Operating a theodolite Part 1

    Operating a theodolite Part 2
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
    Join Date
    Aug 2017
    Thanks Kelly...

  4. #4
    Associate Engineer
    Join Date
    Apr 2018
    Thank you Kelly. This is a great demonstration of a surveying theodolite.

  5. #5
    Join Date
    Nov 2018
    Abu Dhabi
    The terms "Face Left" and "Face Right" originally refered to which side of the telescope the vertical circle of a theodolite lay when the telescope was reversed by rotating it 180 about its tilting axis. It the vertical circle was on the left side of the telescope from the observer's point of view at the eyepiece, that was the Face Left position.

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