slide 51

An interferogram is initially wrapped within the range of 2π, making it difficult to interpret. To address this, the wrapped interferogram is unwrapped to convert it into continuous phases. The popular unwrapping algorithm is called Snap-Hoop and can be found in many InSAR software packages. The details of the algorithm are complex and can be found in their paper. Originally, an interferogram is within the range of 2π. It is called a wrapped interferogram, because the values are wrapped within the range of 2π. It is obvious that it is not an intuitive way to view the result. So, the wrapped interferogram is unwrapped to convert it to continuous phases. The popular unwrapping algorithm is called Snap-Hoop. You can see it in many InSAR software packages. The unwrapping algorithm is complicated. I don't intend to explain the details here. You can read their paper for details.