Space intersection is performed by the trigonometric intersection assuming a parallel projection of IKONOS imagery due to its small FOV and frame size. 影像匹配是采用多重解析度區域影像匹配技術(shù)來(lái)完成共軛點(diǎn)之搜尋，接著(zhù)再利用三角幾何關(guān)系進(jìn)行前方交會(huì )得到地面點(diǎn)三維空間座標，也就是數值地表模型。
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