If you’re commissioning a thermal drone survey in the UK in 2026, your operator is almost certainly flying one of two airframes: the DJI Mavic 3T (M3T) or the larger DJI Matrice 30T (M30T). Both carry a 640×512 radiometric thermal sensor. Both let you do anomaly maps. They are not, however, interchangeable.
Here’s when each one is the right call.
What you’re comparing
| Mavic 3T | Matrice 30T | |
|---|---|---|
| Drone weight | ~920 g | ~3.77 kg |
| Class identifier | C2 | C3 / Specific Cat |
| Thermal sensor | 640 × 512, 30 Hz | 640 × 512, 30 Hz |
| Thermal range | −20°C to +150°C | −20°C to +150°C |
| Visible-light sensor | 48 MP wide + 12 MP zoom (56×) | 4× zoom wide + 200× zoom tele |
| Flight time (real) | ~30 min | ~37 min |
| Wind resistance | 12 m/s | 15 m/s |
| IP rating | none | IP55 |
| Capital cost (2026) | ~£5,500 | ~£14,000 |
What’s the same
The thermal sensor itself is the same module on both airframes. So at flat conditions and the same distance to target, you’re seeing the same thermal data. The Mavic 3T does not produce a worse thermal image than the M30T — the difference is everything around the sensor.
Where the M3T wins
Residential roof inspections. 95% of what we do day-to-day is a single semi-detached or detached house. The M3T is light, agile, fast to deploy, fits into hand-luggage cases, and its sub-1 kg weight makes congested-area operations much easier under the OA. The 56× visible zoom is exceptional for ridge-line close-ups paired with the thermal frame.
Cost-per-job. Capital cost is roughly a third of the M30T, and the lower running cost (no IP55 maintenance, lighter spares, cheaper batteries) makes the per-job economics straightforward.
Where the M30T wins
Commercial / industrial roofs. Large factory roofs, warehouse complexes, multi-block schools. The 37-minute flight time means you finish a 5,000 m² roof in two batteries, not five. The longer wind resistance keeps you flying when the M3T is grounded.
Adverse weather. The IP55 rating means the M30T can fly in light rain — relevant for time-critical insurance claim work after a storm. The M3T has no IP rating and shouldn’t be flown in precipitation.
Long-range zoom evidence. The 200× zoom tele on the M30T lets you photograph small features at distance — useful for power-line, telecoms-mast and bridge work where you can’t close the gap to the structure.
MSX overlay — what to look for in the deliverables
Both airframes support DJI’s MSX (Multi-Spectral Dynamic) overlay, which blends edge detail from the visible-light frame onto the thermal frame at the moment of capture. This is the difference between a thermal blob that you can’t interpret and a thermal anomaly you can map back to a specific tile, gutter, or window.
Insist on MSX-blended frames in the report — not just raw thermal. Both M3T and M30T will produce them; a quality operator will routinely deliver both the MSX-blended frame and the visible-light frame so you can cross-reference.
What this means if you’re commissioning a survey
Don’t worry about which DJI airframe your operator flies — both will give you a credible thermal anomaly report. Do ask:
- What’s the resolution of the thermal sensor? Sub-640×512 is now considered low-resolution. Many cheap thermal payloads run 384×288 or worse.
- Are MSX-blended frames included in the report?
- What’s the temperature delta they consider an “anomaly”? Anything under 2°C is noise; meaningful anomalies are usually 4–6°C+.
- Will the report be delivered as a thermal anomaly report — not a diagnosis or certification? That’s the right scope.