Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales. Featuring tightly integrated vector and raster data, with Natural Earth you can make a variety of visually pleasing, well-crafted maps with cartography or GIS software.
C. Lanzolla, G. Colasuonno, K. Milillo, and G. Caputo. International Journal on Soft Computing, Artificial Intelligence and Applications (IJSCAI), 8 (3):
01-12(August 2019)