Map tiling / slippy map

Cutting a very large map or image into a zoom-level pyramid of pre-rendered tiles fetched on demand by viewport, so huge explorable scenes pan smoothly in the browser without loading everything at once.

grounded in: HN trend 'Personal interactive data visualization' — isometric.nyc, a giant explorable isometric pixel-art map rendered in the browser, and other explorable-map/globe Show HNs