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先验知识是解决反演中信息量不足问题的关键,该文利用地面测量数据的反演结果建立了先验知识库,并用最简化的算法把步验知识应用于AMBRALS反演。先验知识在AMBRALS反演中起的作用,一是判断反演结果的置信度,二是检测和平滑噪声,三是方向采样不足情况下获取合理结果。试验的结果表明,虽然只使用了很粗糙的先验知识,但己经有了良好的效果。
A priori information is crucial to solve ill-posed inversion problems. A priori knowledge database is set up from ground measurement of surface BRDF, which can supply a priori knowledge to the inversion of kernel-driven model and subsequently derive surface albedo.The a priori information plays three roles in inversion; to judge the credibility of inversion result,to detect and Smooth noise in data, and to get a reasonable result when there are