关于太阳耀斑观测的地图匹配算法实现

Realization of Map Matching Method for Observation of Solar Flare

利用海洋的镜面反射进行太阳耀斑观测,要求以星下点为中心的卫星视场必须落在海洋区内。针对如何判定卫星视场和海岸线地图的位置关系问题,文章将卫星视场构成的矩形区域与海岸线地图构成的不规则多边形区域等效为多条线段集合,并提出一种把判断矩形与不规则多边形位置关系转化成判断等效线段之间位置关系的算法。该算法与传统的线段裁剪法或多边形裁剪法比较,具有无需求取线段交点、判断次数大幅减小等优点,能够达到快速判断能否进行耀斑观测的目的。

The observation of the solar flare through mirror reflection from ocean demmands that the satellite’s field of the view, which is centred by the nadir point of the earth, must be located on the surface of the ocean. In this paper, in order to determine the location relation between the satellite’s field of view and the coast line map, a new method is proposed which regards the rectangle formed by the satellite’s field of view and the polygon formed by the coastline as an aggregate of equivalent lines, then it turns into the determination of the location relation between equivalent the lines obtained from rectangle and the polygon. In comparison with the traditional methods, it has the advantage of no need to calculate the point of intersection, less time of judgements, so it can tell whether or not it can perform the observation to the solar flare quickly.