InSAR, Longonot

Wrapped and unwrapped interferograms at Longonot volcano, Kenyan Rift. The wrapped image shows approximately three “fringes”. The interferogram is processed using Envisat imagery; therefore each fringe represents 2.8 cm of ground surface uplift in the satellite line-of-sight. In total, the fringes represent 9.2 cm of ground surface uplift. The unwrapped interferogram (right) shows the same ground uplift, but across one colour scale. Image credit: Elspeth Robertson