Geodetski list, Vol. 51 (74) No. 1, 1997.
Izvorni znanstveni članak
Independent Control of Geodetic Networks Above Long Tunnels by Means of Astronomically Determined Azimuths
Nikola Solarić
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Asim Bilajbegović
; Hochschule für Technik und Wirtschaft, Dresden, Deutschland
Miljenko Solarić
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Drago Špoljarić
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
The work presents the automated astronomical method of determining azimuth and grid azimuth toward to some object on the surface of the Earth. The accuracy of astronomical azimuth determination by observing Polaris with electronic theodolite Kern E2 and Leica T3000 amounts to ±0.4". Such high accuracy in grid azimuth determination enables the control in setting the direction for the tunnel cutting. The paper also describes the application of this method and computation of the influence that the deflection components of the vertical have during the independent control of geodetic networks above the tunnel Chiffa in Algeria and the tunnel Nevesinje in Bosnia and Herzegovina. They are longer than 12 km. The application of astronomical method in azimuth and grid azimuth determination makes it possible to obtain the control of geodetic network accuracy with another independent method. At the same time, the deflection components of the vertical are also controlled. They can significant to influence on the orientation of traverses at the entrances into tunnels, especially if the line of sight to the orientation points are steep. It is also very important in modem GPS technology.
Ključne riječi
Hrčak ID:
291684
URI
Datum izdavanja:
30.6.1997.
Posjeta: 689 *