Phase unwrapping anomaly

[daniel_bona]

Hi there
So I’m still beginner in SAR and Interferomtery
I have a problem with phase unwrapping, I follow the exact instruction and step as in this tutorial and the same data
https://www.asf.alaska.edu/asf-tutorials/data-recipes/insar-phase-unwrapping
https://www.asf.alaska.edu/asf-tutorials/data-recipes/insar-using-sentinel-1-toolbox

Why I get a flate-Earth unwrapped phase

Hello all! Help me find the problem, please. I work with latest version SNAP (3.0.3). The operational system in my computer is Debian Linux 8 (Jessie). The Sentinel-1 images are: S1A_IW_SLC__1SDV_20160109T035542_20160109T035609_009412_00DA26_1176 and S1A_IW_SLC__1SDV_20160414T035543_20160414T035610_010812_0102B5_66E3 I work with uncompressed (un-ZIP) data. I try make the displacement map. But I can not make normal unwrapped phase. I do the following steps (by the tutorial ). I doublicate …

but i get completely different result of unwrapped phase from the tutorial.
And also the snaphu processing product output has naming error for .hdr and .img unwraped phase file see (attachment)
What could possibly I did wrong?

My sistem is
Osgeo 11 distro (lubuntu)
i7 core processor
16gb ram

I tried too using Windows but got the same result
deburst, topo removal, multilooking, filtering

Unwrapped result

[ABraun]

it is strange that you have two bands “phase” (=interferogram) in your stack. Do you have an explanation for that? This probably causes the wrong output of the unwrapping.