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SLAM and static capture underground · tunnels, shafts, mine workings and caverns, where there is no satellite signal.
Underground there is no GNSS, no second chance once the face advances, and no tolerance for a survey that delays the cycle. We carry control in from the surface reference, capture the full excavated surface rather than sampled sections, and return overbreak and underbreak by chainage, void volumes and convergence between epochs.
Three things, and each changes the method. There is no satellite positioning, so every underground survey position is carried in from a surface reference through a traverse, and error accumulates with distance from that reference. There is usually no second chance, because the face advances, the shotcrete goes on and the geometry you failed to capture is gone permanently. And the environment is hostile to instruments and to people · dust, water, poor visibility, ventilation flow and an active working cycle that a survey is not permitted to delay.
What LiDAR changes is completeness. A total station profile gives you a set of points at a section. A scan gives you the whole surface, which is what you actually need to compute overbreak and underbreak against the design profile, to quantify a stope or cavern void, and to compare a section against itself over time to detect convergence. Volume is measured rather than inferred from assumed section shapes, which matters commercially wherever excavation or shotcrete is paid by volume.
The discipline that decides quality is control. A SLAM traverse that is not tied to underground control drifts, and drift underground is unforgiving because there is nothing to check it against.
Chartered Engineer signed deliverables · GNSS-denied capture · routes to the 3D LiDAR practice lead within 24 hours.
Survey control carried from the surface reference through the portal or shaft and extended through the workings. Capture planned around the excavation cycle, ventilation, and the statutory permissions and supervision that apply to work underground on the site.
Handheld or trolley SLAM walked through the drive, tunnel or working, capturing continuously as it moves. Loop closures planned wherever the geometry permits, so trajectory drift is measured and corrected rather than carried through to the deliverable.
Tripod scanning at portals, junctions, shaft stations, monitoring sections and anywhere the deliverable requires higher accuracy than a traverse supports. Static positions are tied directly to underground control.
Trajectories constrained to the underground control network and verified against independent check points, with achieved accuracy reported per section. Where a prior epoch exists, the new capture is registered into the same frame so surfaces can be differenced.
As-excavated profile against design with overbreak and underbreak quantified by section, void and stope volumes, convergence comparison between epochs at monitoring sections, shotcrete thickness estimation where the sequence was captured before and after, and as-built geometry for permanent records.
Underground work is delivered against the survey standards your reviewers apply and within the statutory framework governing the working, with the achieved accuracy reported per section. Every deliverable signed by a Chartered Engineer (CEng MIE India).
Three landmark engagements from our verified roster · quantified outcomes, no client names disclosed without written permission.
SLAM traverse through an advancing drive between blasting cycles, tied to underground control. As-excavated profile compared against design to quantify overbreak by chainage, giving the contractor and client a measured basis for excavation and shotcrete quantities.
Worked-out stopes scanned from safe standoff to compute void volumes for reconciliation and for fill planning, in areas where entry for conventional survey would not have been permitted.
Repeat scans at defined monitoring sections registered into a common frame and differenced between epochs, quantifying convergence over the monitoring period alongside the instrumented array.
Tell us your plant, region, and scope · a named Chartered Engineer responds within 24 hours.