This online course offers an introduction to the fundamental principles and techniques of Polarimetric Interferometric Synthetic Aperture Radar (PolInSAR). Designed as a foundation for those interested in more advanced PolInSAR applications, the course begins with a refresher on SAR remote sensing principles and SAR image interpretation. Participants will build essential knowledge in radar polarimetry and interferometry, and learn how these two approaches combine to form the PolInSAR technique.