Hello everyone,
I am trying to understand the Refined Lee polarimetric speckle filter for dual-pol data and wondering the following~
(1) According to this literature - Mullissa_2018, there is a factor of 2 for the cross-pol channel (VH for Sentinel-1) in the dual-pol Pauli scattering vector k as
I don’t, however, see this factor and its multiple (either 2 or 4) are multiplied in the code (function computeCovarianceMatrixC2) when computing the covariance matrix C2. Is there a reason behind this implementation?
(2) Following previous point, span calculated from the C2 matrix is divided by 2 in the code (function createC2SpanImage). Shouldn’t the trace of a matrix be just the sum of the diagonal terms?
Any inputs are appreciated!
Thanks~