These coherences, also called correlation coefficients, have been used for man-made targets characterization and land cover classification.  ...  Fully polarimetric SAR data are presented in four channels and the coherences between two co-polarized channels or co-polarized and cross-polarized channels are important descriptors for scattering mechanism  ...  Author Contributions: Deliang Xiang is responsible for the design of the methodology, experimental data collection and processing, as well as preparation of the manuscript.  ...