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| IMPROVING THE ACCURACY OF VERTICAL ANGLE OBSERVATIONS | |
| 作者姓名： | Xiao Fuhe Yan Dezheng |
| 作者单位： | Department of Resources Exploitation Engineering，Central South Universityof Technology，Changsha 410083，China |
| 基金项目： | the National Natural Science Foundation of China |
| 摘 要： | ＩＭＰＲＯＶＩＮＧＴＨＥＡＣＣＵＲＡＣＹＯＦＶＥＲＴＩＣＡＬＡＮＧＬＥＯＢＳＥＲＶＡＴＩＯＮＳＸｉａｏＦｕｈｅＹａｎＤｅｚｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＲｅｓｏｕｒｃｅｓＥｘｐｌｏｉｔａｔｉｏｎＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵ... |
| 关 键 词： | vertical angle zenith angle trigonometrical levelling accuracy of observation atmospheric refraction |
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