摘要
对MODIS采集的卫星遥感图像进行几何校正,可以提升卫星遥感图像质量。进行几何校正时,应对卫星遥感图像的几何控制面特征误差进行准确计算,利用计算结果对卫星遥感图像进行几何校正。而传统的低空间分辨率算法通过从建立的卫星遥感图像几何模型中提取少量均匀的控制点,完成图像的几何校正,但不能准确计算几何控制面特征误差,存在校正误差较大的问题。提出一种基于改进距离-多普勒模型的卫星遥感图像的几何校正优化方法。利用多普勒模型对遥感图像目标进行定位,获取卫星遥感图像坐标与地理坐标之间的映射关系,得到出地面目标在卫星转动坐标系中的位置,融合于牛顿力学原理获取卫星平台运动关于图像方位向时间函数关系,建立基于面特征的几何模型,提取卫星遥感图像的几何控制面特征误差,完成了对MODIS卫星遥感图像的几何校正。仿真结果表明,与传统方法相比,所提的几何校正优化方法提高了图像几何校正精度,重建真实的MODIS卫星遥感图像几何特征。
A geometric correction method for satellite remote sensing images is proposed based on improved range Doppler model.The mapping relationship between satellite remote sensing image coordinates and geographic coordinates in positioning of remote sensing image target is obtained.The location of the ground target in the satellite rotation coordinate system is obtained.The geometric model is established based on surface feature for getting the motion of the satellite platform,and the relation of image orientation to time function is fused to Newton＇s mechanics principle.The characteristic error of geometric control surface of satellite remote sensing image is extracted to carry out geometric correction of satellite remote sensing images acquired by MODIS.The Simulation results show that it improves the accuracy of image geometric correction,and reconstructs the geometric features of the MODIS satellite remote sensing image.
出处
《计算机仿真》
北大核心
2017年第3期38-41,共4页
Computer Simulation
关键词
通信卫星
遥感图像
几何校正
Communications satellite
Remote sensing image
Geometric correction
