Analysis and Optimization of Geometric Accuracy of ZY-1 02C HRC Image

Abstract

AbstractThe ZY-1 02C is China’s first operational high-resolution civilian remote sensing satellite. It was launched on December 22, 2011, it has been in a continuous operation on orbit for more than 9 years. It is equipped with a panchromatic and multispectral scanner and a panchromatic High Resolution Camera (HRC) with 2.36 m spatial resolution. The geometric accuracy of ZY-1 02C HRC is evaluated using two revisited data in Northwest China. Based on the ground control points (GCPs) extracted from the ZY-3 standard stereo triplet products, the adjustment accuracy is analyzed, the root mean square error (RMSE) of panchromatic images is within 2.0 pixels. Further, through static and dynamic residual analysis of GCP, it is found that due to the influence of the vibration of the satellite platform, there is a significant dynamic imaging error in the image data, especially in the push-broom direction along the orbit, an effect of about 5.0 pixels in size is detected from the image. After correcting the vibration, the geometric accuracy of the image can be improved to within 1.0 pixels, reaching the geometric accuracy of most images, reducing the adverse effects on the application. In general, this article quantitatively analyzes the geometric accuracy of the ZY-1 02C HRC image, studies the non-negligible vibration effects of the satellite platform, optimizes the geometric accuracy through the data processing method of attitude compensation, and improves the quality of image data.KeywordsZY-1 02CGeometric accuracyVibrationAnalysisOptimization