Gbopa, A.O., Ayodele, E.G., Okolie, C.J., Ajayi, A.O. and Iheaturu, C.J. 2021. Unmanned Aerial Vehicles for Three‑dimensional Mapping and Change Detection Analysis. Geomatics and Environmental Engineering. 15, 1 (Feb. 2021), 41–61. DOI:https://doi.org/10.7494/geom.2021.15.1.41.