Stockpile volume measurement
Measure stockpile volumes by drone in cubic metres and estimated tonnage — without anyone climbing the pile, and without interrupting site operations.
Measure stockpile volumes by drone in cubic metres and estimated tonnage — without anyone climbing the pile, and without interrupting site operations.
A drone stockpile survey captures the complete three-dimensional surface of a pile and calculates the volume from that surface. Where a ground survey recovers a few hundred points across the same pile, a drone survey can capture millions — so the volume is measured across the whole surface, not interpolated between widely spaced points.
The result is a volume statement in cubic metres, with an estimated tonnage where the material density is known, and an accuracy statement so you know how much confidence to place in the figure. It is typically captured on a site that keeps working: the drone operates above the working area and does not interact with plant, vehicles, or personnel below.
How accurate is a drone stockpile measurement?
A drone survey using RTK positioning can typically achieve vertical accuracy within a few centimetres. The advantage over ground methods is coverage as much as precision: the volume is calculated from millions of points across the full surface, rather than from a few hundred points and interpolation.
Every survey is delivered with an accuracy statement, so you know the confidence level of the volume figure before using it for inventory, contractual, or financial purposes.
More about drone survey accuracyIs a drone survey always the right answer?
Not always, and it is worth saying so. Where the material already has a natural unit that is cheaper to count than to survey, counting wins — bales of hay are the standard example. Before quoting, we confirm that a volume or mass figure is actually what you need.
Discuss what you need to measureHow often should a stockpile be measured?
As often as the numbers matter. Because a drone follows the same flight path every time, repeat surveys are directly comparable, which makes monthly or quarterly measurement practical where a stock balance has to be reported or reconciled. Regular measurement also gives early warning when supplies are running low.
More about earthworks and extractive surveysIs this the same as cut and fill analysis?
They are related but not the same. Stockpile measurement quantifies the material sitting in piles on a site. Cut and fill analysis compares the ground surface between survey dates to measure excavation and placement across a site. Both rely on the same underlying surface-comparison method.
More about cut and fill analysis
Just call us, and we'll help you.
Each measured stockpile is reported as a volume in cubic metres, calculated from the full three-dimensional surface rather than from sampled points.
Where the material density is known, the measured volume converts directly to an estimated weight in tonnes.
Each pile is modelled and reported individually, so different grades and storage bays can be reconciled separately.
Repeat surveys track how much material has been added or drawn down between dates. Because the flight path is the same each time, the figures are directly comparable.
A measured number rather than an estimate, for insurance valuations, financing, and disputes over quantity.
A georeferenced model and orthomosaic of the measured stockpiles, delivered alongside the figures as a record of the survey.
A drone volume survey works by capturing the complete three-dimensional surface of a stockpile — millions of points across every slope, ridge, and toe — and then comparing that surface against a reference plane or a previous survey. The volume is the space between the two surfaces. This is fundamentally different from a ground survey, which captures a few hundred points and interpolates the rest.
What is the difference between a DSM and a DTM, and why does it matter for stockpile measurement?
A digital surface model (DSM) includes everything on the ground — stockpiles, trees, buildings, vehicles. A digital terrain model (DTM) represents the bare earth with all surface features removed. The two models are generated from the same LiDAR point cloud: the DSM is the first return (what the laser hits first), and the DTM is produced by classifying and filtering out non-ground points.
For stockpile volume measurement, the calculation is a subtraction: DSM minus DTM over the stockpile footprint equals the pile volume. If you measure from a DSM that includes the pile against a DTM that shows the bare yard underneath, the difference is the volume of material sitting on the ground. Do this across every stockpile on site in a single flight, and you have a complete inventory statement.
More about 3D mapping and surface modelsWhat does an elevation heatmap tell me that a photograph of the stockpile does not?
A photograph of a stockpile can be misleading. Shadows, material colour variations, and the angle of the sun can hide the true shape of the pile. An elevation heatmap replaces colour with absolute height data — every pixel has a known Z-value — so the crest, the toe, and every bench and slope angle are unambiguous.
For stockpile management, this is particularly useful for verifying that material is being stacked within the safe angle of repose, identifying sections of a pile that have been drawn down between surveys, and confirming that aggregate grades are separated and stored in the correct bays. The heatmap turns a pile into a measurable inventory item.
Discuss stockpile volume measurement for your site
A single survey can cover every stockpile on a site, not only the ones that are easy to reach. Each pile is modelled and reported individually, so separated grades and bays can be reconciled separately rather than combined into one figure.
Can stock stored inside a building be measured?
Yes. Bulk commodities held in sheds, silos, or vessels — grain, fertiliser, and similar materials — can be measured with a confined-space LiDAR drone flown inside the building. The stockpile is mapped, and the building is digitally removed to leave an exact measure of what is inside.
More about confined space drone inspectionsDoes the survey interrupt the site?
The drone operates above the working area and does not interact with plant, vehicles, or personnel on the ground. Loading, processing, and haulage can typically continue while the data is captured.
Discuss surveying your site
The drone follows the same pre-programmed flight path each time — same altitude, same overlap, same coverage — so a survey flown this month can be compared directly with one flown last month. The change in the figures reflects the change on site, not a change in how the survey was carried out.
How do you make two surveys comparable?
By flying the same flight path, processing the data the same way, and reporting an accuracy statement with every survey. That consistency is what makes a volume figure from one date directly comparable with another, which is the basis of any drawdown or inventory reconciliation.
More about drone survey accuracy
A drone captures the full pile from the air — no one walking loose material, no risk of slips or collapse, and no working alongside operating plant.
A ground survey recovers a few hundred points across a pile and interpolates the rest. A drone survey can capture millions, producing a far more representative surface for volume calculation.
The drone flies the same pre-programmed path each survey — same altitude, same overlap, same coverage — so figures from one date are directly comparable to the next.
Where material density is known, the measured volume converts to an estimated weight in tonnes — the figure most often needed for haulage and billing.
The survey is flown from above the working area. Extraction, processing, and loading can typically continue while the data is captured.
Every survey is delivered with a documented accuracy statement, so the volume can be used with confidence for inventory, financial, or contractual purposes.
From quarry and landfill inventory to surplus material on construction sites — and bulk commodities stored inside buildings.
Tell us what you need to know, and we will work with you to design survey deliverables that give you the outcomes you need — an inventory figure, a haulage count, or an independent volume for a valuation or dispute.
A typical stockpile survey delivers the volume of each measured pile in cubic metres, an estimated tonnage where material density is known, a 3D model and orthomosaic of the measured stockpiles, and a survey report with an accuracy statement.
Each measured stockpile reported in cubic metres, with an accuracy statement so the figure can be used with confidence.
Volume converted to an estimated weight in tonnes where the material density is known.
A georeferenced model of the measured stockpiles, and an overhead site map for reference and record.
A written report with the figures, the method used, and the documented accuracy of the survey.
Complex surveys and inspections require more than just a pilot. Our engineers can help you scope your requirements and indentify the right approach.
