Quadtree-based image compression formats and level-of-detail systems all work this way. Satellite imagery, terrain rendering, and geographic information systems use quadtree decomposition to serve data at varying resolutions: zoomed out, you see large coarse blocks; zoomed in, you see fine-grained tiles. The same principle extends to three dimensions (octrees) for volume rendering and 3D spatial indexing.
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Thomas said: "Everyone in the Radio 2 presenter family is hugely excited to be heading to Stirling for our Radio 2 in the Park weekend.
* At the end of this file, create a work in progress log, where you note what you already did, what is missing. Always update this log.