控制点误差传播模型及其应用

GCP error propagation model for geometric correction and its application

为了获取遥感影像几何纠正误差空间分布情况,提出一种纠正控制点误差传播模型。该模型首先定义了控制点误差,然后按照控制点误差造成纠正模型参数估计的不确定,通过纠正模型传递至整个区域的建模思路构建了控制点误差传播模型。为将模型推广至更一般的情况,定义了表观控制点误差对误差传播模型进行修正。模拟试验表明,应用该模型可以分析纠正模型的适用性,以及纠正控制点数量、质量及空间分布对纠正精度的影响,为纠正控制点选择和优化提供了一种定量分析方法,对遥感产品应用和成果质量控制具有重要意义。

In order to obtain a residual error map for remote sensing data after geometric correction, a GCP error propagation model was proposed. First, GCP error source was analyzed and modeled. Second, error free for geometric correction model and the uncertainty of GCP caused uncertainty of model parameter which may then be propagated to all the whole area considered were assumed. Finally, a general GCP error is defined to revise error propagation model and this alteration made the model suitable for more general condition. The proposed model is suitable for appreciate GCPs number selecting, allowable GCPs error deciding and suitable spatial arranging. This model also is very useful in remote sensing product quality control because it made it clear where residual error occurred and how much it is and we can use the final product wisely.