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1 2009

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Simultaneous calculation of direct and indirect levelling in investigationg deformations of pagoda-type building

Kujawski E., Yongjing Tang Yongjing

Reports on Geodesy

2009

z. 2/87

193-199

This paper introduces quick measurement of settlenients for a large number of controlled points on tall, multi-storey, pagoda-type constructions. The idea is based on taking measurements in one position of the telescope. Simultaneously it is assumed that every check point will be measured from a minimum of two different tachymeter stations. It is also assumed that the observation will survey the difference in elevation between the horizon of the instrument and the aiming mark representing a given controlled point. The calculations take into consideration the following factors: residual index error of the vertical circle, influence of the Earth's curvature, and atmospheric refraction. Furthermore, it is proposed that direct levelling needs to be executed on each level of the construction.