I was recently on a survey in Mexico mapping ancient Maya architecture with ground penetrating radar (GPR).
The ground was littered with rocks making it difficult to maintain contact between the GPR and the ground.
One way to help overcome this issue is by using a survey wheel instead of a cart.
The survey wheel allows the surveyor to maintain more control.
If you are working in an area with a lot of ground cover, I suggest you try out a single survey wheel.
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Go to LearnGPR to sign up for our free Introductory Training Video on Ground Penetrating Radar (GPR).