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《Science of Surveying and Mapping》 2012-06
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Influence of atmospheric refraction in trigonometric leveling

LIU Nian①②,SHENG Xin-pu②(①Chang'an University,Xi'an 710054,China;②First Geography Diagraph Brigade of NASM,Xi'an 710054,China;③China North Optical-Electrical Technology Co.,Ltd.,Beijing 100176,China)  
Atmospheric refraction is the one of main error sources in surveying filed.From the relationship between the atmospheric refraction and density,this paper discussed the two forms of atmospheric refraction,and analyzed its effect on zenith angle and distance measurement.Research conclusion showed that the errors of atmospheric refraction could been weakened at the time of temperature gradient reversion.
【CateGory Index】: P224.2
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