worldtilegrid.RdA "tile grid map" is a cartogram that uses same-sized tiles in approximate, relative positions of each other to represent a world map. The world tile grid relative position reference system used by this 'ggplot2' 'Geom/Stat' was the original work of 'Jon Schwabish' and converted to 'CSV' by 'Maarten Lambrechts'.
Ref: https://policyviz.com/2017/10/12/the-world-tile-grid-map/
Ref: http://www.maartenlambrechts.com/2017/10/22/tutorial-a-worldtilegrid-with-ggplot2.html
Useful links: