A Method for Geometric Correction of AVHRR Data
A Method for Geometric Correction of AVHRR Data
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AVHRR数据的几何校正方法
DOI：
10.11440/rssj1981.15.16
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
M. Takagi
中科院分区：
文献类型：
--
作者：
Yaudong Chang;M. Takagi
本文提出了一种AVHRR数据的几何校正方法。NOAA卫星采用开普勒模型，地球采用贝塞尔椭球模型。由于AVHRR影像的大小，使用双线性插值来加速制图过程。最佳的块大小使用卫星和地图图像插值确定。由于TBUS上的轨道信息仍存在微小误差，因此仅使用THUS仍有一定的残差。因此，通常使用GCP来提高几何校正的精度。通过曲线拟合的方法，以多项式形式分析了每个轨道根数和卫星报告时间（卫星内部时钟）对GCP剩余误差的趋势。采用多项式算法从GCP的残差中估计出各轨道根数和卫星报告时间的变化。最后通过实验验证了该方法的有效性，并对本文提出的几何校正方法进行了总结。
The present paper proposes a method for geometric correction of AVHRR data. A Keplerian model for NOAA satellite and the Bessel ellipsoidal model for the Earth are used. Due to the size of AVHRR imagery, the bilinear interpolation is used to speed up mapping procedure. The optimal block sizes for using interpolation on satellite and map imagery are determined. Because the orbital information on the TBUS still exists tiny errors, there is still some residual error only using THUS. Thus, GCP is usually used to improve the accuracy of geometric correction. The tendency of each orbital element and satellite reported time (satellite internal clock)for the GCP's residual error is analyzed by curve fitting method as a polynomial expression. An algorithm with the polynomial expressions is used to estimate the variations of each orbital element and satellite reported time from the GCP's residual error. Finally, An experimental result is shown to verify the proposed method, and we will conclude our proposed geometric correction method.