The other two proceed along longitudinal paths from pole to pole, flying at an altitude of 850 kilometers and passing over Taiwan every six hours. The photos they send cover a smaller area but are clearer than the ones produced by the other sort.
繞極軌道衛星則繞行通過二極附近，每隔六小時經台灣上空一次，其飛行高度僅八百五十公里，觀測範圍較小，但也比較清楚。