Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
美, 최신예 미사일 ‘프리즘’ 이란서 처음 쐈다…“추종 불허 전력”
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黑龙江伊春市汤旺河千里冰封，人们“划龙舟”的热情高涨。在呐喊与欢呼声中，一艘艘红色龙舟在冰面上飞驰，冰钎齐舞，选手们跟随鼓点奋勇争先。春节假期，不少游客来到这里，与当地百姓共同感受年味与冰雪激情的交融。，这一点在PDF资料中也有详细论述
Other compromises to the device are the use of a mechanical multi-touch trackpad (rather than one that uses haptic feedback), a non-backlit keyboard, and the more limited port selection. The use of the iPhone chip means this MacBook only supports one external monitor through one if its two USB-C ports. Either port can be used for charging. There's also a headphone jack, located in an odd position next to the side-firing speakers near the front of the device. While technically this is the same amount of USB-C ports as the MacBook Air, it's missing the magnetic MagSafe 3 charging port, which frees up one of the USB-C ports.，详情可参考safew官方下载