Leveling Methods An instrument at point B is set up in the bottom of a depression with its scope measured 1.40m above ground. The purpose of the station is to determine the elevations of both points A and C which are located on the peaks of the valley. Two vertical angles of +11°30’ and +13°15’ are made with the scopes of the instrument to points A and C respectively. Preliminary survey suggests that points AB is measured with a horizontal distance of 583m and points BC is measured with a horizontal distance of 1,125m. Considering the earth’s curvature and atmospheric refraction, determine the elevation of both A and C if the elevation of the station is 75m above sea level.
Leveling Methods An instrument at point B is set up in the bottom of a depression with its scope measured 1.40m above ground. The purpose of the station is to determine the elevations of both points A and C which are located on the peaks of the valley. Two vertical angles of +11°30’ and +13°15’ are made with the scopes of the instrument to points A and C respectively. Preliminary survey suggests that points AB is measured with a horizontal distance of 583m and points BC is measured with a horizontal distance of 1,125m. Considering the earth’s curvature and atmospheric refraction, determine the elevation of both A and C if the elevation of the station is 75m above sea level.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Leveling Methods
An instrument at point B is set up in the bottom of a depression with
its scope measured 1.40m above ground. The purpose of the station is to
determine the elevations of both points A and C which are located on the
peaks of the valley. Two vertical angles of +11°30’ and +13°15’ are made
with the scopes of the instrument to points A and C respectively.
Preliminary
distance of 583m and points BC is measured with a horizontal distance of
1,125m. Considering the earth’s curvature and atmospheric refraction,
determine the elevation of both A and C if the elevation of the station
is 75m above sea level.
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