Leveling: closed loop and double way run
Hello everybody,
I need some help because I do not have much experience in high precision leveling.
The leveling will be carry out by a Topcon DL-101C, 2 invar rods with bipods and standard base plates. They demanded us for a high precision leveling ( 2.5 mm??L) for monitoring some buidings maybe involved by a landslide. We have only one control BM (elev.=0 m.) outside the area involved by the landslide.
What do you think about adopting a closed loop and a “double way run” (starting from a BM and turning back on it after a number of turning points) together? I have attached an image to illustrate more the possible plan:
1) from BM1 up to point 2 and turning back to BM1 (Magenta).
2) Closed loop from point 2 (green)
3) from 6 to 9 and turning back to 6 (red)
4) from 14 to 16 and turning back to 14 (light blue)
In the image red points are fixed into the pavement or walls, blue points would be the positions of the base plates (frog). We need more base plates positions because the area is quite steep and the specs do not want more than 40 m. between the rod and the turning point. Orange area are buildings and black area are unaccessible/occlusive.
https://www.dropbox.com/s/su44vctne2df9oy/villini%20Model%20%281%29.jpg?dl=0
Thanks a lot.
Bests
P.S….Why can’t I attach files?
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