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| A NEW SURVEYING METHOD ON EXISTING RAILWAY FOR IN-CREASING LEVELLING ACCURACY FROM 1/2 000 TO 1/10000 |
| LIU Zhiyi,SUN Jizhong |
| Third Survey and Design Institute of MOR |
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Abstract The paper introduces a new surveying method in which the different surveying station on an existing railway line during the survey procedure are connected as a complete photoelectric guide line， so as to increase the overall accuracy. By using this new surveying method.the levelling accuracy on existing railway line may be increased from 1/2 000 to 1/10 000, It play an important role of raising qualitv and eliminating mistakes for survey and design on existing railway lines.
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Received: 21 January 1999
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1999, Vol. 16 
