Under Yeongdong-daero in Seoul’s Gangnam district, a 1.2 km underground complex is being built between Bongeunsa and Samsung stations. When it finishes in 2028 it will hold about 21,000 m² of transport hub up to 60 m below ground, with a park on top. The scan has to be repeatable, so the drawing and what has actually been built can be placed side by side.
S2 where GPS does not reach
The local survey team uses the FJD Trion S2 as the main tool in the larger volumes: up to 120 m range and about 1.2 cm accuracy, with SLAM that does not need GNSS. In tight shafts and high ceilings the scanner sat on FJD’s extension pole so staff did not have to climb into the risk zone. A built-in panoramic camera colourised the cloud and gave a live preview.
Monthly checks in Trion Model
- Noise filtering of scaffold and temporary walls
- Volume calculation of excavation and fill
- Horizontal and vertical sections into CAD/BIM
- Deformation comparison between scans from different dates
In FJD Trion Model the team could follow the build month by month, from ground level into the deepest sections, and catch deviations from the drawings early. Colourised clouds became a shared record for the contractor, the engineer, and the client, which reduced manual measuring in exposed positions.
Summarised from a customer story published by FJD Trion (Opens in a new tab). Contact Norrpoint for tunnels, plants, and GPS-denied sites.
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