I have been conducting some displacement analysis using Sentinel-1 and have been outputting bizarre / odd results, and would be very grateful if someone could advise the potential source of error.
My set-up is (apologies if this is not detailed enough):
SNAP version: 3.0
S1TBX version: 3.0.1
OS: 64-bit Windows and Centos 7 on Linux server (for SNAPHU)
I have been using the following graph process (attached):
20160518_InSAR_ESD_DEFOv2.xml (6.8 KB)
Everything runs without error, however, I get outputs which have a clean linear pattern (error) across the scene. Can anyone provide some insight as to why this is happening?
These are 24-day separated pairs with coherence between 0.8 and 0.9 and low perpendicular baselines (about 20 - 60 m)
I am confused as to:
A) Why the linear pattern from north-to-south or south-to-north? If it was in direction of the sensor I would assume look / squint angle issues.
B) What unit is the result in? I should point out I have just terrain-corrected the phase to displacement output.
Hope this makes sense, any help would be greatly appreciated!