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| | Abstract | | The authors have been applying GPR to non-destructive tree diagnosis and the paper presents examples. First we carried out tree root survey of Kuromatsu pine in Mihonomatsubara. The accurate positioning of the GPR antenna by self-tracking total station enables to scan circularly around a tree. We successfully visualized the details of the tree root distribution. Second we diagnosed deteriorations in trees trunks at a primary school near our office. We migrated the GPR reflection data incorporating the shapes of the tree trunks measured by self-tracking TS. We also overlaid the migrated images on the ortho-photos of ground surface around the tree generated by SfM-MVS. To evaluate the strong reflections in images of tree trunks, we additionally measured transmission waves. The continuity of the signals indicated the presence of a void inside the trunk. We concluded that the tree root survey by GPR can contribute to soil improvement for recovering tree health, and that the tree trunk imaging considering trunk shape can be applied only to damaged trees screened by simple and low-cost measurement/analysis. |
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