Warta Geologi, Volume 46, No. 2, August 2020, pp 107-112


Rock slope discontinuity extraction from 3D point clouds: Application to an open pit limestone quarry

Syaran Suri*, Aisyah Shahirah Juhari, Solihin Yaacob, Nur Emilia Qistina Anua, Hareyani Zabidi

Mineral Resources Engineering, School of Materials and Mineral Resources Engineering,
Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
* Corresponding author email address: syaransuri@gmail.com

Abstract: Discontinuities dominantly play a key role in the mechanical, hydraulic, and deformational behaviors of rock masses, frequently impose significant influence on the stability of rock slopes. Thus, it is important to have a profound knowledge on the discontinuity network in rock engineering. This paper focuses on the identification of plane within 3D point clouds using the Discontinuity Set Extractor (DSE) program in MATLAB® (The Mathworks Inc.). The 3D point clouds were generated using the Agisoft PhotoScan Professional digital photogrammetry software (version 1.1.6) from photos captured via UAV method. To verify the plane identification, the photogrammetric results were compared with the manual mapping generated using the scanline method. Rosette plot for both methods revealed discontinuities set of similar direction but different in quantity. The most dominant discontinuities orientation was in the NNW-SSE direction at N330° - N340°, while the least dominant orientation took place in the E-W direction at N080° - N090°. The reliability of the discontinuity models was enhanced using the Structure from Motion (SfM) technique.

Keywords: Open pit quarry, discontinuity, Point clouds, UAV

DOI : https://doi.org/10.7186/wg462202011