For most of the regions, isoseismals are of somewhat elongated shape. The empirical point-ellipse model can reduce systematic deviation of point-source and fault-rupture models.

对多数地区，等震线略具狭长的形状，经验点椭圆模型可以减小点源模型和断层破裂模型的系统偏差。

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Using ellipse hypothesis, one can only compensate the deviation for UAV flying in horizontal plane by the data sampled while UAV flying in more than 5 direct.

采用椭圆假设算法，可利用飞机平飞时在多于5个不同方向的采样数据来自动补偿平飞时的罗差。

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Using ellipse hypothesis, one can only compensate the deviation for UAV flying in horizontal plane by the data sampled while UAV flying in more than 5 directions.

采用椭圆假设算法，可利用飞机平飞时在多于5个不同方向的采样数据来自动补偿平飞时的罗差。

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