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1·According to the theory of vanishing point, a novel approach to calibrate the boresight misalignment of airborne position and orientation system (pos) based on photo nadir point is proposed.

基于灭点理论，提出一种利用像底点检校机载POS系统视准轴误差的方法。

2·Now the optimizer should have a good starting point. Enable 'use control points of:' for the nadir image, enable Viewpoint optimization for the nadir image, and optimize again.

现在优化器应该有一个良好的起点。启用“使用控制点：'低潮的图像，使图像的角度优化的最低点，和再优化。”

3·Healthy maw is relatively fixed going up celiac, when the person stands, gastric nadir cannot exceed below hilum 2 horizontal strokes to point to (point to) of gastric small turn.

健康人的胃相对固定在上腹腔，当人站立时，胃的最低点不能超过脐下二横指(指胃小弯)。