顾及地形改正的地理定位查找表模型反算

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地理定位查找表(geolocation look-up table,GLT)广泛应用于摆扫式成像传感器影像的地理定位,基于GL T模型的坐标反算是卫星数据几何处理中的重要步骤.由于GL T模型是由影像坐标获取地理位置的正向索引,没有确定的反算函数,因此基于GL T数据的坐标反算较为困难.针对现存坐标反算方法受地形起伏影响大、精度低等问题,提出一种带有改正高差引起像点位移的线性逼近的坐标反算法.首先,由物方坐标线性迭代逼近计算像方坐标;然后,改正由线性内插计算高程与真实高程不符引起的像点位移,将物方点精确反算至像方系统.以M ODIS数据为算例进行分析,实验结果表明,最大误差小于0.03个像元,优于现有算法.
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