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Combined with long-term archive data since the 1990s when JERS-1 had been operated and with various satellite SAR observations, we are now entering a SAR big data era. The next generation of advanced SAR satellites such as ALOS-4 and NISAR, the global trend toward an open and free data policies for satellite data, and the small SAR satellite constellations from the private sector are allowing us to explore new frontiers in Earth science. In addition, there have been reported applications of AI techniques for SAR data analysis, and novel observation platforms, such as ground-based SAR with high temporal resolution and UAV-SAR with operational flexibility. These advances indicate that the SAR utilization has become widespread in both basic research (e.g., earth science) and various applications (e.g., disaster prevention, and forest monitoring). In this session, we would like to invite various kinds of research and application results related to SAR, sharing our knowledge and having a discussion for the advancement of the SAR utilization.