Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
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1927年9月，鄂西秋收暴动的第一枪——当阳瓦仓起义打响，极大地震慑了土豪劣绅和国民党反动派。抗日战争爆发后，宜昌成为中共湖北省委、湘鄂西区党委机关所在地，领导湖北、湘鄂西地区人民顽强抗日。