引用本文: 舒宁. SPOT卫星影象严密数字几何校正的直接法[J]. 武汉大学学报 ( 信息科学版), 1992, 17(3): 77-82.
Shu Ning. Direct Method in Strict Digital Geometric Rectification for SPOT Imagery[J]. Geomatics and Information Science of Wuhan University, 1992, 17(3): 77-82.
 Citation: Shu Ning. Direct Method in Strict Digital Geometric Rectification for SPOT Imagery[J]. Geomatics and Information Science of Wuhan University, 1992, 17(3): 77-82.

## Direct Method in Strict Digital Geometric Rectification for SPOT Imagery

• 摘要: 由于SPOT卫星影象的行中心投影成象方式和外方位元素时序变化特点,在实施严密数字几何校正的过程中,直接法的应用显示了很大的优越性。为此,本文提出了应用直接法的原理和方法,指出了技术关键和确保锚点坐标解算精度和可靠性的方法。由于直接法可较精确地确定锚点所在行的外方位元素,不需要迭代计算,因而不仅计算速度快,而且从实验结果包括锚点坐标计算精度,锚点网格内插精度估计和几何校正结果之正射影象精度的分析都表明直接法优于间接法,证实了所提出的原理方法的合理性和正确性。

Abstract: The direct method has shown us its advantages in the procedure of strict digital geometric rectification, because of the central projection in each scan line of SPOT image and the time-sequeutial changes of exterior orientation elements for each line. This paper, therefore, proposes the principles and technologies for taking the direct method into use, and points out the key techniques and the approaches to assure the accuracy and reliability of anchor points. Since the direct method can correctly determine, without iteration, the exterior orientation elements of the line at which anchor point is located, the calculating speed is faster than indirect method and the experiment results are better in accuracy of anchor points, precision comparison for evoluating the interpolation within each grid cell when using anchor points as control points, and the cheek and the analysis for the geometric precision of rectified images, thus proving the resouableness and corrcctuess of the proposed principles and approaches.

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