Application of Ground-Penetrating Radar for Detecting Internal Anomalies in Tree Trunks with Irregular Contours.To assess the health conditions of tree trunks, it is necessary to estimate the layers and anomalies of their internal structure. 
Ground-Penetrating Radar
The Hilbert transform algorithm and the reflection amplitudes were used to estimate the relative dielectric constant. 
Hilbert transform algorithm
The Hilbert transform algorithm and the reflection amplitudes were used to estimate the relative dielectric constant. 
reflection amplitudes
The point cloud data technique was applied as well to extract the irregular contours of trunks. 
point cloud data technique