Same-day volumetric survey for a Dublin construction site facing a subcontractor dispute. Client called at 9:30 am. Certified volume report delivered by close of business. Saved the client a significant sum in disputed materials.
A main contractor on a large civil engineering project in Dublin received an invoice from a groundworks subcontractor for a volume of excavated material that, in the main contractor’s view, significantly overstated what had actually been removed from site. The disputed difference ran to a material sum of money. Both parties had agreed to resolve the dispute through an independent volume measurement – but that measurement needed to happen before the material was moved again.
The main contractor called DSI at 9:30 in the morning. The site was active, access was restricted to an agreed window before the afternoon shift began moving material, and the project manager needed a certified volume report to present to the subcontractor before the end of the working day. A traditional survey team would have taken at least two days to mobilise, survey, and process.
This was a same-day job or it was useless.
DSI operates a same-day emergency survey service for exactly these situations. From the 9:30 call, equipment was loaded and the team was on the road for Dublin within 45 minutes. The client had already confirmed the access window and the approximate extent of the stockpiles, so no additional site briefing was needed on arrival.
On site, we deployed the Matrice 300 RTK with the P1 camera for a photogrammetric survey of all stockpile areas. Four ground control points were placed and surveyed with the Emlid RS3 to anchor the point cloud to accurate real-world coordinates. The aerial capture took 40 minutes. Because the survey was for dispute resolution, the GCP control was essential – the volume result needed to be defensible, not just approximate.
Images were processed in the van on return to base using a high-specification mobile workstation. The dense point cloud was generated, quality-checked, and each stockpile boundary was defined in consultation with the agreed base plane that both parties had previously referenced. Volume calculations were run for each stockpile and summed for the total. The result came in significantly below the subcontractor’s claimed figure.
The final report included: the certified volume figure for each stockpile, the GCP accuracy summary, the orthomosaic with stockpile boundaries marked, a cross-section profile through each pile, and a statement of methodology signed by the survey lead. This package is designed to be used directly in a commercial dispute context. It was delivered to the client at 14:30 – five hours after the initial call.
The certified drone measurement showed the actual excavated volume was materially less than the subcontractor’s claimed figure. The client used the certified report to negotiate a revised invoice.
From the initial call to certified report delivery: five hours. The material was not moved before the survey was complete, preserving the evidence for the dispute resolution process.
The subcontractor accepted the certified drone volume report as an independent measurement and did not contest the methodology. The dispute was resolved without legal proceedings.
Following the emergency survey, the main contractor engaged DSI for monthly stockpile volumetric surveys for the remainder of the project, providing an ongoing independent record to prevent future disputes.
“We needed data that would hold up in a commercial dispute, and we needed it the same day. DSI delivered a fully certified report by mid-afternoon. The subcontractor accepted it and we settled the dispute that evening.”
Project Manager, Civil Engineering Contractor – Dublin
Accurate volume calculations for quarries, construction sites, landfills, and storage depots.
Regular drone surveys to track progress, volumes, and site conditions throughout a project.
Survey-grade photogrammetric mapping for engineering, planning, and dispute resolution.
The client was an Irish quarry operator supplying aggregate into a scheduled export shipment. The operator’s normal volume reporting runs on a monthly cycle using a combination of machine tickets and periodic traditional surveys. On this occasion, a commercial dispute over the quantity in a specific stockpile meant the operator needed an independent, defensible volume figure before a loading window closed at the end of the working week. A traditional topographic survey would have taken longer than the available window and would still have left the accuracy open to challenge. That is the scenario drone survey was built for. [Client type confirmed as quarry operator. If you would like the write-up adjusted to a different sector or a named client with their permission, let us know.]
The stockpile in question represented roughly one ship load of material and had been drawn down and replenished several times over the preceding weeks. The quarry’s internal weighbridge records and the buyer’s expected tonnage did not reconcile. The commercial team needed to know, with a figure that could be defended in a formal dispute process, exactly how much material was in the pile on the day of measurement. Survey accuracy of a few per cent would not settle the question. The difference in dispute was inside 3 per cent of the total volume. [Exact value in dispute can be added here if the client is willing to disclose it.]
“We needed a number we could stand over and we needed it the same day. DSI were on site within two hours of the call and the report was with us before close of business. The residuals gave us something we could put in front of the buyer without qualification, and the dispute went away. For a quarry that ships into tight loading windows, that level of responsiveness is the reason we now keep their number on the operations board.”
Quarry manager, Irish aggregate operator [name withheld until client approval]
Emergency volume surveys sound like an edge case, but in the Irish aggregate, construction and waste-handling sectors they are a regular commercial reality. Loading schedules, payment disputes, end-of-period reporting, insurance claims and regulatory inspections all create moments when a defensible volume figure is needed quickly. DSI operates across Ireland and can typically be on site within a few hours of a call from Dublin, Cork, Limerick, Galway and the Midlands. The combination of rapid mobilisation, survey-grade accuracy and a documented residuals report is what makes drone volume survey the right tool when time is short and the number has to hold up.
For sites within a two hour drive of Dublin we can typically be on site within 3 to 5 hours of a first call during working hours. For sites further from base, same-day mobilisation is normally achievable if the call comes in before lunchtime. We keep the equipment packed and charged for this exact scenario.
Yes, when the survey is run to survey-grade standards with RTK or PPK positioning and independent check points. On a clean stockpile with a defined base plane, DSI delivers volumes accurate to inside 1 to 2 per cent of the total figure, with the residuals report to prove it. That is tighter than the accuracy claim on most truck weighbridge readings, which is why drone volume surveys now regularly settle disputes that would previously have gone to formal adjudication.
Three things make the flight faster and the result tighter: clear access to the stockpile perimeter so we can place ground control, a contact on site who can brief us on any overhead services or restricted airspace, and a clean hard-standing reference area near the pile where we can establish the base plane. If the site is inside 5 kilometres of a controlled aerodrome or has any other airspace complication, tell us on the call so we can factor it into the mobilisation plan.
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