图说：高解析度卫星影像成形技术绝大部分都是采用推扫式（Push-broom）的扫描方式；因此，一张完整的卫星影像是由数千到数万个阵列影像所组成，每一条扫描线皆有其对应之外方位参数。
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线阵推扫式影像外方位元素间的强相关性，导致法方程病态，外方位元素的最小二乘估计值误差较大。
The strong interrelationship among exterior elements of linear pushbroom imagery induces normal equation severely ill-posed and least squares value deviated from the true value.
同大多数的线阵推扫式影像相比，TM影像作为双向扫描型的影像其几何校正方法有其特殊性和复杂性。
Compared with most linear array push-broom images, the geometric correction methods of TM image, which is double-scanning image is particular and complex.
第三章以PHI为代表介绍了线阵推扫式成像光谱仪的结构和工作原理，然后对PHI图像的几何校正方法进行描述。
Third chapter: introducing the structure and work principle of push-broom scan imager with PHI; introducing the method of PHI image's geometric correction.
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