Abdul Kahar, M. A. ., Madun, A. ., Hussin, H. ., Abu Talib, K. ., & Wahab, S. W. . (2021). Geological Terrain Mapping using Geographic Information System (GIS) and Drone Photogrammetry. Journal of Sustainable Underground Exploration , 1(1), 1-9. https://penerbit.uthm.edu.my/ojs/index.php/j-sue/article/view/10233