Deriving contour lines from digital elevation models using Geographic Information Systems (ArcGIS software). Libyan Open University Journal of Applied Sciences (LOUJAS), [S. l.], v. 1, n. 2, p. 19–27, 2025. DOI: 10.65422/loujas.v1i2.95. Disponível em: https://oujournals.ly/index.php/LOUJAS/article/view/95. Acesso em: 11 dec. 2025.