Okon, E., M. N. Ono, and F. Onyeagoro. “Investigating the Altitude-Dependent Accuracy of Depths Derived by Colour Ratio from Unmanned Aerial System (UAS)-Multispectral Imageries”. Journal of Spatial Information Sciences 2, no. 2 (June 15, 2025): 50–77. Accessed June 23, 2025. https://journals.unizik.edu.ng/jsis/article/view/6298.