I’ve downloaded 75 ERS Precision Image products collected in the first weeks of 1996 over the East Antarctic Plateau from ESA dissemination service. All underwent the same processing in SNAP (Orbit file>Calibration>multilooking>speckle filter>terrain correction). Considered the site and the small time span, they should match pretty fine over the respective overlapping areas. However they are all misaligned, often also images acquired consecutively.
Does anybody know if there is a special processing technique for ERS products or the poor georeferencing it is a common issue?
Is there a way to realign coherently the products? Unfortunately a S1 image cannot be used as a guide due to the drift of the ice sheet to the sea.
Any suggestion is appreciated,