Practice question · Match the pairs
Match each technique to the physical property it measures.
- Magnetometry
- Resistivity
- GPR
- LiDAR
- Return time of laser pulses from the ground
- Resistance to an electrical current
- Timing of reflected radar pulses
- Local contrasts in soil magnetism
Hints
- Each instrument measures one physical property.
- Two of them work by timing a reflected pulse.
Show the answer
- Magnetometry → Local contrasts in soil magnetism
- Resistivity → Resistance to an electrical current
- GPR → Timing of reflected radar pulses
- LiDAR → Return time of laser pulses from the ground
Why
Four instruments, four physics — magnetism, current, radar echo, laser echo — each turning an invisible contrast into a map.
Practise Remote Sensing and Geophysics
The app has 5 more questions on this lesson, and keeps your place in the course. History I is free to start.
More questions on Remote Sensing and Geophysics
- Order a modern non-destructive investigation from first step to last.
- A parched cropmark and a lush green one appear side by side in one field. Why do buried features produce…
- Why has LiDAR transformed archaeology in forested regions?
- Sort each signature: does it mark a buried ditch/pit or a buried wall?
- A clear rectangular anomaly in a magnetometry survey proves a Roman building lies buried there.
- In drought a crop grows taller and greener in a narrow strip. What is buried, and why does it produce that…