Tang, Jing, Petter Pilesjö, and Andreas Persson. “Estimating Slope from Raster Data – a Test of Eight Algorithms at Different Resolutions in Flat and Steep Terrain”. Geodesy and Cartography 39, no. 2 (June 28, 2013): 41-52. Accessed September 21, 2024. https://transport.vgtu.lt/index.php/GAC/article/view/4060.