During crater profile measurement, when performing upheaval measurement, the person holding the rod continues to take one pace toward the stanchion until the

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Multiple Choice

During crater profile measurement, when performing upheaval measurement, the person holding the rod continues to take one pace toward the stanchion until the

In crater profile upheaval work, the rod and stanchion setup uses a sight line to read vertical displacement. As you advance toward the stanchion, you adjust the geometry so the line of sight just aligns with the rod’s target triangle. You continue moving one pace at a time until that target triangle on the rod can no longer be seen. That moment marks the correct distance for taking the reading with the intended geometry, minimizing parallax and ensuring a consistent, repeatable measurement. If you stop because the stanchion is visible, you haven’t fixed the necessary alignment—the crucial cue is the visibility state of the target triangle, not the stanchion itself.

In crater profile upheaval work, the rod and stanchion setup uses a sight line to read vertical displacement. As you advance toward the stanchion, you adjust the geometry so the line of sight just aligns with the rod’s target triangle. You continue moving one pace at a time until that target triangle on the rod can no longer be seen. That moment marks the correct distance for taking the reading with the intended geometry, minimizing parallax and ensuring a consistent, repeatable measurement. If you stop because the stanchion is visible, you haven’t fixed the necessary alignment—the crucial cue is the visibility state of the target triangle, not the stanchion itself.

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