期刊
ACTA POLYTECHNICA
卷 61, 期 3, 页码 476-488出版社
CZECH TECHNICAL UNIV PRAGUE
DOI: 10.14311/AP.2021.61.0476
关键词
Refraction; vertical temperature gradient; zenith angle; beam path; vertical shifts
资金
- Grant Agency of CTU in Prague [SGS20/052/OHK1/1T/11]
The paper presents the results of a long-term experiment on temperature measurement in engineering surveying, focusing on the theoretical effect of the atmosphere on measured zenith angles. By determining accurate temperature gradients at various heights in different seasons, a numerical model was used to calculate refraction-induced vertical shifts.
This paper presents the results of over a year-long experiment dealing with a temperature measurement to calculate the theoretical effect of the atmosphere on the measured zenith angle in engineering surveying. The measurements were performed to determine the accurate and specific temperatures (temperature gradients), which can be recorded in different seasons in the low level of the atmosphere (up to 2 m above the ground, where most Engineering Surveying measurements take place) for the geographical area of Central Europe - specifically the Czech Republic. A numerical model was then applied to the resulting determined temperature gradients to calculate the path of the beam passing through an inhomogeneous atmosphere. From these values, the apparent vertical shifts caused by refraction in a given environment and time were finally determined.
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