S+SNZ Spatial Measurement Practice Questions - S+SNZ Professional Examination - Spatial Measurement Option (New Zealand) Exam

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When conducting high-precision digital leveling over a distance of 2 km, which of the following field procedures is most effective in eliminating the combined effect of Earth's curvature and atmospheric refraction?

Keeping backsight and foresight distances equal. Using a high-quality invar leveling rod. Taking measurements only at midday when the air is stable. Performing a two-peg test before starting the run.

Correct Answer:

Keeping backsight and foresight distances equal.

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