Journal Article

3D GPR Image-based UcNet for Enhancing Underground Cavity Detectability

Kang, Man-Sung, Lee, Jong-Jae, Im, Seok Been, An, Yun-Kyu, Kim, Namgyu

2019

Overview

This paper proposes a 3D ground penetrating radar (GPR) image-based underground cavity detection network (UcNet) for preventing sinkholes in complex urban roads. UcNet is developed based on convolutional neural network (CNN) incorporated with phase analysis of super-resolution (SR) GPR images. CNNs have been popularly used for automated GPR data classification, because expert-dependent data interpretation of massive GPR data obtained from urban roads is typically cumbersome and time consuming. However, the conventional CNNs often provide misclassification results due to similar GPR features automatically extracted from arbitrary underground objects such as cavities, manholes, gravels, subsoil backgrounds and so on. In particular, non-cavity features are often misclassified as real cavities, which degrades the CNNs’ performance and reliability. UcNet improves underground cavity detectability by generating SR GPR images of the cavities extracted from CNN and analyzing their phase information. The proposed UcNet is experimentally validated using in-situ GPR data collected from complex urban roads in Seoul, South Korea. The validation test results reveal that the underground cavity misclassification is remarkably decreased compared to the conventional CNN ones.

• Publisher: MDPI AG
• Subject: Artificial neural networks / automated underground object classification / Automation / Cavities / Classification / data collection / Data interpretation / deep convolutional neural network / False alarms / Feature extraction / Ground penetrating radar / Holes / Image classification / Image enhancement / Image resolution / Manholes / Neural networks / Object recognition / phase analysis / Radar imaging / Remote sensing / roads / Roads & highways / Sinkholes / South Korea / subsoil / Subsoils / super-resolution / underground cavity detection network / Underground roadways / Urban areas