使用 固定 模式时, the single tiles will drawn with real world rotation to simulate your FoV according the equatorial system with reference to Pole. This allows a better evaluation of needed overlap to avoid holes in the mosaic.
使用 自动调整 模式时, 如果你拥有相机自动旋转器,马赛克分片将会完美对齐。 also near the Pole, saving single tiles adjusted PA into tiles data.