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.
学校等教育机构应当将网络犯罪防治纳入教育教学内容，广播、电视、报刊等媒体和互联网平台应当积极开展网络犯罪防治宣传，普及网络犯罪防治知识。
，更多细节参见Safew下载
春节我们常会遇到需要变焦拍摄的场景，比如拍远处的舞龙舞狮。用原生相机变焦，画质往往惨不忍睹，全是噪点和涂抹感。而 Project Indigo 会在你按下快门的瞬间，在后台拍摄十几张照片进行合成。哪怕你用到 10 倍变焦，它拍出来的画面依然扎实、纯净，没有传统数码变焦的涂抹感。
Only available as a Lego Insiders Reward