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遥感数据的地理定位精度是影响其定量化应用的重要因素,为了提高FY-3B中分辨率光谱成像仪(MERSI)L1级数据的定位精度,分析了地理定位算法模型中安装矩阵与实际定位偏差之间的关系,通过修正风云三号卫星地面应用系统预处理模块中参数——安装矩阵,提高了地理定位精度。当仪器坐标系分别绕X轴、Y轴和Z轴旋转一个小角度后,遥感图像的定位结果会分别产生左右平移、前后平移和旋转变形。分析并建立旋转角度与变形之间的数量关系,根据海陆掩码与遥感图像的偏差程度估算安装矩阵的误差。修正安装矩阵后,计算出的定位结果准确性得到明显提高,精度达到1个像元左右。通过一段时间的业务系统测试,地理定位结果的质量稳定可靠。
In order to improve the positioning accuracy of L1-level data from FY-3B medium-resolution spectral imager (MERSI), the geolocation accuracy of remote sensing data is an important factor affecting its quantitative application. By modifying the parameter-installation matrix in the pretreatment module of the Fengyun III satellite ground application system, the geolocation accuracy is improved. When the instrument coordinate system is rotated by a small angle around the X axis, Y axis and Z axis, respectively, the positioning results of the remote sensing images will have left-right translation, front-back translation and rotation deformation respectively. The relationship between rotation angle and deformation is analyzed and established. The error of installation matrix is estimated according to the degree of deviation between land-sea mask and remote sensing image. After fixing the installation matrix, the accuracy of the calculated positioning result is obviously improved, and the precision reaches about 1 pixel. After a period of business system testing, the quality of the results of the geolocation is stable and reliable.