slide 40

Interferometric SAR, or INSAR, involves the interference between two SAR images to extract useful information such as surface elevation and displacement. The result is an interferogram, which can be used to create a global digital elevation model or monitor volcano-related displacement. INSAR can also measure displacement caused by events like earthquakes and tectonic motion. In the following slides, I will introduce some knowledge about interferometric SAR, INSAR. Interference means the interaction between two coherent faces. So, interferometric SAR means it does interference between two SAR images. It focuses on the face component in the backscatter. The outcome of interference between two SAR images is an interferogram. We are able to extract some useful information from the INSAR, such as the surface elevation and surface displacement. You can see the two figures. The left figure is the global digital elevation model made from the INSAR. It was generated by the SRTN mission. The right figure is to use INSAR to monitor volcano-related displacement. You can also use INSAR to measure displacement, such as length of silence, earthquake, tectonic motion, etc.