Bac F4 Niger
Baccalauréat Série F4 — Génie Civil (Niger)
Topography And Site EngineeringEnglish
Exam overviewPractice session
In optical differential leveling (nivellement direct), a surveyor at an instrument setup takes a backsight reading (lecture arrière - Lar) of 1.650 m on point A (altitude H_A = 120.500 m) and a foresight reading (lecture avant - Lav) of 0.850 m on point B. What is the elevation H_B of point B?
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