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Research and Practice on Precise Trigonometric Leveling to Replace Second-class Leveling Survey in Erdos City

JIA Zhongfu YANG Yu FENG Qijun (Inner Mongolia Autonomous Region Institute of Surveying and Mapping,27 Aimin Street,Hohhot 010051,China)  
The principle and method of TCRA 1201 total station height automatic measuring system are introduced.Combining with the actual measurement and application of Erdos City,TCRA 1201 Precise Trigonometric Leveling can realize second-class leveling surveying.
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