TL;DR
This drone surveying FAQ answers the questions Australian mine managers, site engineers and project leads ask most often before commissioning a UAV survey. In short: a properly controlled drone survey achieves 10-30 mm horizontal accuracy, every commercial flight is regulated by CASA under Part 101, and results are usually delivered in MGA2020 within 2-5 business days. Prices run from roughly $1,500 for a single stockpile to $50,000+ for multi-tenement LiDAR mapping.
Key takeaways
- A drone survey controlled with ground control points (GCPs) delivers 10-30 mm horizontal and 20-50 mm vertical accuracy — comparable to ground RTK for earthworks, stockpiles and topographic mapping (CASA, 2024).
- All commercial UAV work in Australia requires a CASA Part 101 Remote Operator Certificate (ReOC) and a licensed Remote Pilot (RePL); the operator carries the compliance burden, not you.
- Photogrammetry suits clear, open ground and visual deliverables; LiDAR is the choice for vegetated terrain and penetrating canopy to bare earth.
- Standard deliverables are georeferenced to GDA2020 / MGA2020 (or your site grid) with heights on AHD, supplied as orthomosaic, DSM/DTM, point cloud (LAS/LAZ) and contours.
- Drone volumetrics for stockpile reconciliation typically reach 1-3% volume accuracy and cover an entire ROM pad or run-of-mine yard in a single flight.
How accurate is drone surveying, really?
Accuracy is the first question every engineer asks, and the honest answer is "it depends on how the survey is controlled". A drone flying blind on its onboard GPS alone is good for situational awareness, not for engineering decisions. A drone flown with surveyed ground control points or an RTK/PPK positioning system, and verified against independent check points, is a different proposition entirely.
| Configuration | Horizontal accuracy | Vertical accuracy |
|---|---|---|
| Photogrammetry, onboard GPS only | 1-5 m | 2-10 m |
| Photogrammetry, RTK/PPK (no GCPs) | 30-100 mm | 50-150 mm |
| Photogrammetry, ground control points | 10-30 mm | 20-50 mm |
| LiDAR with ground control | 20-50 mm | 10-30 mm |
For an open-cut pit survey, a haul-road geometry check or a month-end stockpile reconciliation, the GCP-controlled figures above are well within tolerance. Where you need sub-centimetre precision — structural set-out, dimensional control on a SAG mill, deformation monitoring of a tailings dam embankment — UAV data is a complement to, not a replacement for, total station and terrestrial laser scanning.
Key point Accuracy claims without independent check points are just claims. A professional drone survey ships with a quality report stating reprojection error, GSD (ground sample distance), point density and the residuals at checkpoints. Always ask to see it.
What CASA rules apply to commercial drone surveys in Australia?
Every commercial UAV operation is regulated by the Civil Aviation Safety Authority under Part 101 of the Civil Aviation Safety Regulations. The practical requirements break down as follows.
| Requirement | Detail |
|---|---|
| Operator certification | Remote Operator Certificate (ReOC) for commercial operations |
| Pilot licensing | Remote Pilot Licence (RePL) for the relevant weight class |
| Aircraft registration | All drones over 250 g registered with CASA |
| Standard conditions | Daylight, visual line of sight, below 120 m AGL, clear of populous areas |
| Area approvals | BVLOS, night, controlled airspace and operations near aerodromes need specific CASA approval |
The compliance burden sits with the operator, not the client. You do not need your own CASA approval to commission a survey — but you should verify your provider holds a current ReOC, that the pilot holds an appropriate RePL, and that public liability insurance includes aviation cover (we recommend $10M minimum). Operations near a mine-site aerodrome or in restricted airspace over a port require coordination that adds lead time, so flag those early.
Should I choose LiDAR or photogrammetry?
This is not an either/or decision so much as a "which fits the site" decision. Photogrammetry stitches hundreds of overlapping photos into a coloured 3D model; LiDAR fires laser pulses and measures the ground directly, including beneath sparse to moderate vegetation.
| Factor | Photogrammetry | LiDAR |
|---|---|---|
| Bare earth in vegetation | Poor (can't see ground) | Excellent (multiple returns) |
| Visual detail / texture | Excellent | Limited (intensity only) |
| Low light / overcast | Limited | No restriction |
| Relative cost | Lower | 40-100% higher |
| Best for | Open pits, stockpiles, progress imagery | Vegetated rehab areas, exploration corridors, topographic mapping |
For a cleared Pilbara iron-ore pit or a Bowen Basin ROM pad, photogrammetry is usually the more economical choice. For a rehabilitation site at a Hunter Valley coal operation with regrowth, or a pipeline corridor through scrub, LiDAR earns its premium by reaching the true ground surface.
What deliverables and coordinate systems do I get?
A drone survey is only useful if it lands in the right datum and the right file formats for your downstream software. ISS delivers georeferenced to GDA2020 / MGA2020 by default, or to your established mine grid, with heights reduced to AHD.
| Deliverable | Description | Typical format |
|---|---|---|
| Orthomosaic | Geometrically corrected aerial map at uniform scale | GeoTIFF, JPG + JGW |
| Digital Surface Model | Elevation of the top surface (vegetation, structures) | GeoTIFF, LAS |
| Digital Terrain Model | Bare-earth elevation | GeoTIFF, LandXML |
| 3D point cloud | Millions of classified 3D points | LAS, LAZ, E57 |
| Contours | Elevation lines at specified intervals | DWG, DGN, SHP |
| Volumetric report | Calculated volumes with stated methodology | PDF + digital surfaces |
Specify your coordinate system, vertical datum and contour interval up front — re-projecting after the fact wastes time, and mismatched datums are the most common cause of "the survey doesn't line up with our design" complaints.
How much does a drone survey cost?
Pricing is project-specific, but indicative ranges for sites within around 200 km of a capital city are below. Remote operations — a Newman iron-ore site, a Mount Isa lease, a Kalgoorlie goldfields tenement — attract a mobilisation surcharge for travel, accommodation and FIFO logistics.
| Project type | Technology | Indicative price (AUD, ex GST) |
|---|---|---|
| Single stockpile / small site (<5 ha) | Photogrammetry | $1,500-3,500 |
| Topographic survey (10-50 ha) | Photogrammetry | $2,500-5,000 |
| Large-area mapping (50-200 ha) | LiDAR | $8,000-15,000 |
| Corridor survey (roads, pipelines) | LiDAR | $8,000-20,000 |
| Multi-tenement exploration | LiDAR | $15,000-50,000+ |
For a deeper breakdown of the factors that move the price, see our drone survey cost guide for Australia.
How long does it take from flight to deliverables?
Field time is measured in hours, not days. A 50-hectare site flies in 30-45 minutes; a 200-hectare site needs 2-3 hours of flying including battery swaps and GCP set-out. Processing — densifying the point cloud, classifying ground, generating surfaces and contours — takes 4-24 hours depending on image count and deliverable complexity. Most projects are delivered within 2-5 business days of the flight. Rush turnaround of 24-48 hours is available and typically adds a 25-50% premium for after-hours processing.
Can a drone survey be done during an operating shift or shutdown?
Yes, with planning. On a live mine, the survey is coordinated around the dig plan and traffic management so the aircraft stays clear of operating equipment and personnel — one of the safety advantages of UAV work is that it removes surveyors from active pits and unstable stockpile faces entirely. During a plant shutdown or turnaround, drone imagery and point clouds capture high or hard-to-reach structures quickly while access is available, feeding straight into rapid as-built and maintenance planning. ISS operates extended and out-of-hours where the shutdown window demands it.
Frequently asked questions
How accurate is a drone stockpile volume survey?
Properly controlled drone volumetrics typically achieve 1-3% volume accuracy on well-defined stockpiles, which meets the requirement for month-end reconciliation and inventory reporting at most Australian mining operations. Accuracy degrades on stockpiles with steep, shadowed faces or fine material that the camera struggles to resolve — those situations are where LiDAR or a supplementary ground survey adds value.
Do I need my own CASA approval to commission a survey?
No. The drone operator holds the ReOC and manages all Part 101 compliance, registration and any area approvals. Your only responsibility is to engage a properly certified, insured operator and to provide site access, inductions and any aerodrome or airspace context relevant to your location.
What equipment does ISS use for drone surveys?
ISS operates survey-grade UAV platforms (including DJI Matrice-class aircraft) carrying high-resolution photogrammetric cameras and survey LiDAR payloads, with ground control established by Leica and Trimble GNSS and total station equipment. For complementary close-range capture on plant and structures we also use terrestrial laser scanners such as FARO and Leica units. We recommend the technology that suits your project, not the gear we happen to own.
Can drones see through vegetation or underground?
Optical cameras cannot. LiDAR penetrates sparse to moderate canopy using multiple-return pulses to detect ground beneath foliage, which is why it is the standard for vegetated rehab and corridor work. Neither technology works underground — for sub-surface utilities or voids, ground-penetrating radar is the correct tool.
What weather stops a drone survey?
Rain, fog and strong wind are the main constraints. Most survey-grade aircraft fly safely in winds up to 30-40 km/h. Rain affects camera performance and aircraft safety, and low cloud shortens the usable window. In Australian conditions, early-morning flights usually offer the calmest air and the best, low-angle light for photogrammetry.
How does drone surveying compare to a ground survey?
For large open areas, drones cover 50-150 hectares per day against 5-10 hectares for a two-person ground crew, at comparable accuracy once controlled — see our drone survey vs ground survey comparison. For boundaries, underground services, structural set-out and sub-centimetre work, conventional survey remains the right approach. The best programmes use both: drones for area, ground methods for precision.
Request a drone survey quote
If your operation involves regular stockpile measurement, pit and dump progress, rehabilitation monitoring or corridor mapping, a drone survey can cut field time, remove people from hazardous ground and put accurate data in your hands within days. ISS is CASA-certified, operates Australia-wide, and delivers in GDA2020 / MGA2020 with full quality reporting. Tell us your site, area, accuracy requirement and deliverables, and we will scope the work and provide a written quote within 24 hours. Call 0407 057 015 to discuss your next drone survey.