3 ms·
Survey equipment. RTK GPS for position reference and heading on the surface, and lasers. Lots of lasers. see e.g. http://www.leica-geosystems.us/en/Tunnel-surv
by hamiltonkibbe 11y ago
Survey equipment. RTK GPS for position reference and heading on the surface, and lasers. Lots of lasers.
see e.g. http://www.leica-geosystems.us/en/Tunnel-surveys_1693.htm http://www.leica-geosystems.us/en/Tunnel-surveys_1693.htm