P. E. Ulotu, “Vertical Assessment of Public Global Digital Elevation Models Including 1"SRTM Generally, and in Eight Sample Land Covers and Terrains of Tanzania”, ASRJETS-Journal, vol. 29, no. 1, pp. 327–339, Apr. 2017, Accessed: Oct. 07, 2025. [Online]. Available: https://asrjetsjournal.org/American_Scientific_Journal/article/view/2846