SEGJ Technical Conference

Developement and Validation of 3-D GPR techniques at our test facilities for vuried objects - Comparison to the laser-scanned positions and shapes prior to the installation

Abstract We constructed and opened test facilities for buried objects in order to induce the development of innovative 3-D GPR techniques. The buried objects were not only laser-scanned prior to the installation but photographed from the air to build 3-D model. There are three sites for buried objects in the facilities. Many Hume pipes were installed at Site 3 with various array pattern. We conducted highly dense GPR survey to the Site 3. Although the application of migration and Hilbert transform enabled us to obtain the 3-D volume rendering result, it was difficult for us to recognize the Hume pipes array since many clutters appeared on the image. We assumed that clear hyperbolic curves always appear on buried pipes. Thus, we calculated semblance spatial distribution and the maximum semblance points on hyperbolic curve generated by point reflection. The results of weighting the processed amplitude with the semblance distribution or the maximum points showed that many clutters were reduced effectively. We think that the future work is to develop grouping method of the maximum semblance points for automatic volume rendering.