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Electromagnetic
- Magnetic field — Measure deviations from natural magnetic field densities caused by ferrous objects
- Derivatives & filters — Processing of magnetic field
- Vertical gradiometer — Measure the differences with two sensors offset vertically
- Infrared imaging — Measure & image the infrared reflectivity & radiation of flora, rocks & oil sludge,
- Laser scanning — 3D laser theodolite scanning of tunnels, bridges & structures
- Photography — Obtain orthorectified normal, oblique & aerial photography
- Ground penetrating radar (GPR) — Acquire, process & interpret the reflectivity of 100MHz electromagnetic waves below the ground surface; velocity estimation
- Underwater & aerial video — Obtain video as independent evidence in underwater or subsurface survey
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