图 1 球面大圆与球面小圆(即互补比率均值)指标 Fig. 1 Diagram of great circle arcs and small circle arcs (i.e., average ratio between complementary profiles[25]) based metrics
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图 2 彭纳投影的底索指标和采样点 Fig. 2 Tissot's indicatrices of Bonne projection and sample points of Bonne projection
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小圆指标[25]需要计算两个球面小圆弧长