多边形的自动搜索是GIS空间分析的基本算法之一，同时也在地籍拆宗、导线网闭合环的闭合差计算等领域有着重要的作用。
Automatic searching polygon is one of essential algorithm in GIS spatial analysis and important used in cadastral treatment and closing error of traverse network calculation.
等离子体片中的粒子被加热和加速后，注入近地空间，产生环电流和极区亚暴。
The particles are heated and accelerated in the plasma sheet, and then injected into the near earth space, and produce the ring current and auroral substorm.
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