KEGS Ottawa June Meeting

   

Extracting Geophysical Information from 3D Images Acquired on a
Mobile Underground Vehicle 

 

Dr. Brian Lynch
Postdoctoral Fellow with Professor Claire Samson 

Tuesday, June 20th 
4:30 p.m. 

Harrison Hall
Room 177
601 Booth Street 

 

Abstract 

This research focuses on the extraction of rock face properties from 3D images acquired on a mobile device while accounting for errors due to uncertainty. The use of LiDAR (Light Detection And Ranging) has become invaluable for many applications in geology including surveying and extracting geophysical properties of rock faces, surpassing manual techniques in accuracy and efficiency. The majority of such applications rely on tripod-mounted stationary devices that provide high resolution 3D images with negligible error. However, stationary LiDAR devices require careful setup and calibration, and may not be a feasible option in locations that are difficult to access by a geologist or surveyor. Instead, a mobile system may be used to scan rock faces and underground tunnels using on-board LiDAR devices. This approach is much more efficient and versatile since the system may be mounted on a ground or air vehicle, deployed faster, and cover a wider region of interest. The primary disadvantages when using mobile LiDAR devices are lower resolution within the 3D image and higher point error, especially when applied to underground environments where no GPS (global positioning system) information is available. Therefore, innovative methods are required to process the data and extract reliable geophysical information such as strike and dip, surface roughness, or rock face displacements. This seminar will discuss the process of mobile scanning in detail and present methods being used to overcome the inherent challenges.

 

Biography 

Brian Lynch is a Postdoctoral Fellow in the Department of Earth Sciences at Carleton University, as well as an Adjunct Professor in the Department of Electrical & Computer Engineering at Queen's University. He has a background in aerospace engineering and robotics that has led him to pursue research in the areas of automation for mining and exploration applications on Earth and in space. His current research focuses on the use of 3D data collected from a mobile platform in underground environments for performing geotechnical analyses.