Two points, A and B, are 3,134.50 meters apart. From a third point, C, on the line between A and B, and 1,992.25 meters from A, the measured vertical angle to A is +35°28' and that to B is -15°14'. Considering the effect of curvature and atmospheric refraction, A. If the height of instrument above the ground at C is 1.15 m, determine the difference in elevation between A and the ground point C. B. Determine the difference in elevation between B and the ground point C. C. Determine the difference in elevation between A and B.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Two points, A and B, are 3,134.50 meters apart. From a third point, C, on the line
between A and B, and 1,992.25 meters from A, the measured vertical angle to A is
+35°28' and that to B is -15°14'. Considering the effect of curvature and atmospheric
refraction,
A. If the height of instrument above the ground at C is 1.15 m, determine the difference
in elevation between A and the ground point C.
B. Determine the difference in elevation between B and the ground point C.
C. Determine the difference in elevation between A and B.
Express the answers in 3 decimal places.
Transcribed Image Text:Two points, A and B, are 3,134.50 meters apart. From a third point, C, on the line between A and B, and 1,992.25 meters from A, the measured vertical angle to A is +35°28' and that to B is -15°14'. Considering the effect of curvature and atmospheric refraction, A. If the height of instrument above the ground at C is 1.15 m, determine the difference in elevation between A and the ground point C. B. Determine the difference in elevation between B and the ground point C. C. Determine the difference in elevation between A and B. Express the answers in 3 decimal places.
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