Practice question · Sort into groups
Sort each signature: does it mark a buried ditch/pit or a buried wall?
Groups: Buried ditch or pit · Buried wall or road
- Crop parches early and grows stunted
- Crop stays green and tall during drought
- Hard reflective surface in a GPR slice
- High electrical resistance (dry stone)
- Strong magnetic response from silted organic fill
- Low electrical resistance (damp fill)
Hints
- Ditches hold damp fill; walls are dry and dense.
- Every method reads that same opposition differently.
Show the answer
Buried ditch or pit: Crop stays green and tall during drought, Low electrical resistance (damp fill), Strong magnetic response from silted organic fill
Buried wall or road: Crop parches early and grows stunted, High electrical resistance (dry stone), Hard reflective surface in a GPR slice
Why
Ditches are damp, magnetic, and generous to roots; walls are dry, resistant, and hostile. Every geophysical method reads the same opposition through a different physics.
Practise Remote Sensing and Geophysics
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