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Tree Inspection by GPR Reflection and Transmission Measurements
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 25th European Meeting of Environmental and Engineering Geophysics, Sep 2019, Volume 2019, p.1 - 5
Abstract
Tree trunk inspection has been conducted to assess the risk of the collapse and maintain the safety of pedestrians. Conventional methods often involve invasive measurements that may cause further damages to trees. Radar can be used as a tool to non-invasively image the inside structure of tree trunk for the inspection. We developed a workflow of the inspection that combines reflection and transmission measurements. It makes inspection work efficient; the quick assessment by transmission measurement and detailed inspection by reflection imaging. In addition the permittivity of tree trunk, which is required for reflection imaging, can be estimated from the transmission measurement data. Consequently, we can improve the quality of reflection imaging by using the estimated permittivity. In the present paper, our workflow for the tree inspection by radar is illustrated and demonstrated with data collected for old trees in a shrine.