Tunnel survey involves in measuring the locations and layout of tunnel’s position and guiding of tunnel boring machine in the correct direction and position. Survey activities include ground surface survey, transferring the alignment and levels underground, measuring tunnel position and providing boring line.

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1. Explore NPark's Tree GIS Portal
2. Dimensional Control Survey
3. Hydrographical Survey
4. Measured Survey
5. Monitoring Survey
6. Road Data Hub/GIS Data Hub
7. As-built Survey
8. Engineering Survey

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