| 摘要 |
PURPOSE:To calculate a position to be measured by a simple operation, by preliminarily arranging a gyrocompass and a range finder at the horizontal external position of a cylindrical structure and measuring the azimuth angles and distances with respect to three arbitrary places on the outer peripheral surface of the cylindrical structure. CONSTITUTION:A measuring apparatus 1 is arranged at the arbitrary horizontal external position of a cylindrical structure 5 to be fixed horizontally and brought to a stationary state by starting a gyrocompass. The arrangement position of the measuring apparatus 1 is set as the origin of polar coordinates and azimuth angles theta1, theta2, theta3 to the due north direction N are measured with respect to three arbitrary places A, B, C along the peripheral direction on the outer peripheral surface of the cylindrical structure 5 by the gyrocompass and horizontal straight line distances (polar coordinate distances) rho1, rho2, rho3 are measured with respect to said places A, B, C by a range finder. Subsequently, the polar coordinates distance rho0 to the center P of the curvature of the cylindrical structure 5, the azimuth angle theta0 to the due north direction N and the outer diameter D of the cylindrical structure 5 are calculated by a simple operation.
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