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  • I suggest using GPS, ideally with a 3-receiver base network. RTK is an option for real time work, or post-processed static will also work. Site conditions must allow sky view of course, and the base stations need to be well laid out (in terms of geometry) coordinated, levelled, etc. We've used a single base RTK setup on cable stayed bridges (up to RL +135m only) to check/verify the pylon jump form coordinates using a 3-pt resection and the results were similar. 

    In a location where it is not possible to see ground control points, even on neighbouring buildings, careful use and management of GPS equipment and methods should work.

    BR

    Dave Mitchell

    Ho Chi Minh City, Vietnam

  • Survey Legend

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