Khapung - who retired in November - has not replied to the BBC's request for comment.
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Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.
1月20日，省部级主要领导干部学习贯彻党的二十届四中全会精神专题研讨班开班。习近平总书记谆谆告诫：“要树立和践行正确政绩观，坚持从实际出发、按规律办事，自觉为人民出政绩、以实干出政绩。”