加入地形改正的卫星影像多项式模型研究

本文针对一般多项式只适用于平坦地区或垂直成像卫星影像正射纠正的不足,根据摄影测量理论中地形起伏产生的像方位移可以用特定的数学公式表达的特点,在多项式纠正方法中引入投影差改正,实现了更精确的微分多项式纠正。文章首先分析了地形起伏引起像点位移原理,在此基础上建立了高程改正的卫星影像多项式模型,设计并实现了修正后的模型的定向方法及正反算算法。实验表明该模型较一般多项式模型X方向上精度有很大提高,适用于山区卫星影像纠正。

Study on the satellite image polynomial model with topographic correction

According to the point that image displacement due to hypsography can be expressed in a mathematic formula and the shortcoming that the polynomial model is only fitted to plat areas, a new model added with topographic correction is proposed in this paper. Through analyzing the principle of image point displacement, the paper constructs image polynomial model based on topographic correction technology, designs and realizes corresponding algorithms and orientation method of polynomial model that has been modified. Experiments show that the accuracy of this model is higher than that of normal polynomial model in X direction in mountain areas.