M. R. Mohd Azri and S. B. H. Syed Mohamad, “Assessment of Building Roof Defects Using Unmanned Aerial Vehicle (UAV) and Condition Survey Protocol (CSP) 1 Matrix System”, rtcebe, vol. 4, no. 1, pp. 430–439, May 2023, Accessed: Jul. 21, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/5883