Error in unwrapped process

[Tomcater]

Hi ABraun,
Thank you for an answer. I performed the second step because I must use images which were coregistered once to one master. Because of that I’m taking images from the super-stack and preparing ifg-pairs based on such images. I must prepare all the possible ifg-pairs and I need to find parameters for each pair. Finally, I need to find heights, I would do it as you suggested:

NaN pixels are produced after doing DEM generation

first you retrieve both elevation (from SRTM) and unwrapped phase at random points to calculate a correlation. then you use the correlation as a regression model to estimate the height (y) at every pixel based on the unwrapped phase (x) . [image] Image source That is not the most elegant method but it is a workaround I was successful with. Theoretically, you could also calculate absolute heights from unwrapped phase knowing the ambiguity height, wavelength and incidence angle. [image] I…

Actually, that still the same task that we were discussing some time ago.
Averaging? Does it mean Stack averaging?
AFAIK Elevation means that SNAP creates DEM and Height means DSM. I’m looking for DSMs, but my equal elevations in the different pairs confuse me.
All in all, I use 6 images which were went through the next steps:

1. Applying orbit file
2. Split
3. Deburst
   4)Subset
4. Coregister to one master
5. Create stacks based on the images from the previous steps
6. Ifg creation
7. Topo phase removal
8. Goldstein
9. Export (Topo, MST)
10. Import
11. Range-doppler.
    Step 6 is supposed to be a cure for the SNAP’s inability to create ifg with a user-defined master from the stack.
    Thank you!