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Between your exploration area and your desired data needs, Radai is taking care of everything

With permits to fly in 7 countries, since 2013, Radai provided environmental and geophysical measurement services using Unmanned Aerial Vehicles (UAV) to over 40 customers, performed 155 drone surveys, and flown over 250 000 line-km. 

Radai's Geophysical Services

Radai provides fully integrated drone-based geophysical services for mineral exploration, geological mapping, environmental monitoring and conductivity mapping.

Our superior value proposition is maintained by a highly skilled team with an innovative mindset, which continuously looks for solutions to solve customer’s problems. 
Radai’s services are tailored to customers’s needs. Our experienced team manages the complete workflow—from survey planning and data acquisition to processing, modelling and interpretation—using Radai’s in-house developed software and technologies (Read more).


Customers receive high-quality datasets, maps and reports that support informed decision-making through fast, flexible, accurate and cost-efficient geophysical solutions.

Magnetic Field Measurements (Video & Overview)

Radai delivers highly accurate drone-based magnetic total field and vector magnetic surveys. By installing cutting-edge magnetometers onto autonomous UAV flight platforms, we efficiently map complex subsurface structures to provide clear visualization of geological assets.So far, Radai provides the following magnetic survey services: Drone-based magnetic total field surveys, Drone-based vector magnetic surveys.

1) Digital 3-component fluxgate (FG) magnetometer

  • Sensitivity ±0.5 nT, dynamic range ±100 000 nT
  • Radai’s multi-purpose (RMP) datalogger (ca. 135 Hz)
  • Decimation & averaging of raw data ® 20-10 Hz (0.8-1.5 m)

2) Fixed-wing VTOL  (Vertical Take-Off and Landing) drones

  • Orientation (roll, pitch, yaw) from separate IMU
  • Gives XYZ components of the (vector) magnetic field

3) Data processing using equivalent layer modelling (ELM)

  • Numerical inversion used to level datasets from each flight and compute various corrections
  • ELM used to compute gridded data and derivative results at constant height (with altitude correction)

4) 3D vector magnetic inversion

  • Matlab code by Dr. Arto Karinen
  • Vector magnetic data gives improved 3D inversion results
Radiometric surveys (Video & Overview)

Radai’s drone-based radiometric survey system provides a fast, flexible and cost-efficient solution for mineral exploration and geological mapping. The system measures naturally occurring gamma radiation associated with potassium (K), uranium (U) and thorium (Th) in rocks, soils and sediments. Variations in these elements provide valuable information about geological conditions and soil composition and can support mineral exploration and site characterization.

Radai's radiometric survey system: Horsefly UAV + Medusa MS-1000 sensor
The Horsefly octo-copter carries a Medusa MS-1000 gamma-ray spectrometer, logging the gamma spectrum alongside GNSS position and barometric, temperature and humidity data. Horizontal GNSS accuracy is below ±0.5 m and vertical accuracy below ±1 m during flight.

HORSEFLY UAV platform:
- Electric engines - 8 × 3000 W
- Diameter - 1.31 m
- Max. take-off weight - 25 kg
- Survey speed - 8–10 m/s
- Flight duration - up to 60 min

Medusa Ms-1000 Gamma-Spectrometer
- Crystal type / volume - 3×9" CsI / 1000 ml
- Energy spectrum - 0–3 keV
- Sampling frequency - < 5 Hz
- Storage - 500 h



Electromagnetic surveys (Video & Overview)

Radai’s novel EM survey system provides information about the electrical conductivity of the subsurface. The applications of the EM system include geological mapping, mineral exploration, groundwater studies, geotechnical investigations, and environmental monitoring. The airborne system has the benefit of avoiding terrain obstacles and, thus, offers faster, safer, more cost-effective survey data.. (Read more)

  • Semi-airborne version uses fixed ground loop transmitter & airborne 3-component receiver towed by a VTOL drone
  • Fully airborne version uses small (r<0.6m) transmitter loop attached to the towing drone
  • Noise level < 20 fT 3 frequencies (2.3, 4.6, 9.2 kHz) 1 Hz sampling
  • Depth of exploration 1-300 m
  • Data post processing by 1D and 3D inversion
Data interpretation (Overview)

Radai provides advanced geophysical data interpretation services that transform drone-based magnetic, electromagnetic (EM) and radiometric measurements into actionable geological information. The services include data processing, spatial analysis, geological interpretation, anomaly identification, 3D modelling and integration of multiple geophysical and geospatial datasets to identify structures and prospective targets. The resulting maps, models and interpretations help mineral exploration customers prioritize targets, optimize follow-up surveys and drilling, and reduce exploration costs and uncertainty.

Radai offers high-resolution ground geophysical surveys designed to complement drone-based measurements and provide detailed information on priority exploration targets. Services include ground magnetic, electromagnetic (EM), and radiometric surveys, enabling more precise characterization of geological structures, conductivity, target depth and geometry, and variations in potassium, uranium and thorium. By integrating ground measurements with UAV datasets, Radai delivers a more comprehensive understanding of subsurface geology, helping to reduce exploration risks and improve mineral targeting and resource-development decisions. (Read more)

Radai's survey process

Superior Resolution

High-resolution data from low-altitude measurements.

More Flexible Field Operations

Flexible deployment and fast survey planning

More Cost Efficient

Drastically cuts down field crew overhead and equipment logistics.

Safer for Workers

Minimizes personal exposure in unpredictable remote terrain.

Faster Exploration Process

Accelerates campaign timelines with real-time field data delivery.

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