“Comparison of Vertical Accuracy of Open-Source Global Digital Elevation Models: A Case Study of Adama City, Ethiopia”, TURCOMAT, vol. 12, no. 4, pp. 1731–1744, Apr. 2021, Accessed: Jun. 08, 2026. [Online]. Available: https://www.turcomat.org/index.php/turkbilmat/article/view/1437