ground penetrating radar gpr. gpr emits scan signals to detect object below earth`s surface . 3d render view 9

below beneath data drone earth echoes electromagnetic frequency geological geology geomatics georadar gpr ground illustration land machine map mapping navigating navigation penetrating penetration pulse pulses radar radio reflected reflecting rendering robotic scan scanner scanning scans searching sensor signal signals sonar sub subsurface subterranean surface surveillance survey surveying system technology topographic topography transmitter under underground waves world