Locating tree roots in subsurface is an important task in the treatment of unhealthy trees. There are some examples of tree root imaging by ground penetrating radar (GPR) scanned in multiple straight survey lines. Tree roots tend to extend in radial direction from the trunk and the conventional straight line scanning is not optimum considering antenna polarisation. We developed a GPR system that records accurate position of antennas by tracking with a total station. The system is allowed to scan freely while data collection for 3D measurements and thus circular scanning can be employed in the tree root imaging. In this way, antennas directed normal to scanning direction can keep polarisation parallel to radially directed targets and thus receiving higher reflection amplitude from tree roots is expected compared to scanning in other directions. We used the system for trees in parks and major root systems were successfully imaged. The present paper illustrates the imaging results.


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