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惠及人口最多，全国农村自来水普及率达到96%。全面推行城乡供水一体化、集中供水规模化、小型供水规范化、县域统管专业化“3+1”标准化建设和管护模式，规模化供水工程覆盖农村人口比例、县域统管比例分别达71%和72%，更多偏远地区喝上了“放心水”。报装、报修、缴费等服务“网上办”“码上办”，从源头到水龙头的水质保障体系逐步完善。
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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.
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