ALOS PALSAR Level 1.1 (FBD H-H pair) processing using ISCE: Questions regarding misregistration step

[Hassan2211345]

Hey there everyone,
I have run stripmapApp processing using ISCE, to generate interferogram using a pair of scenes.
Step misregistration gave me some warnings.

Even though it completed to the end successfully, there were warning that I think might be the cause of distortion of my interferogram in the end. My question is, the parameters for example the window skip size, can we include something in our input file to avoid such problem.

Attached is my final figure after running up to the filtered interferogram stage.

Misregistration step processing dialogues:
Scale Factor in Range: 1.0
Scale Factor in Azimuth: 1.0
Skip Sample Down: 924
Skip Sample Across: 99
Input Bands: 1 1
XXX start timer
wisdomFile, length = 0
WARNING - number of samples availabe for estating gross offset is NOT power of 2: 80
the value is computed as 2*i_srchy/winsize_filt
better to make it power of 2 for FFT
current i_srchy (azimuth search window size): 40
current winsize_filt (azimuth filtering window size): 1
CAUTION - Requesting very large search window pull in
Reference Window Size is 128 sample pixels
Number of Search Pixels is 40 sample pixels
The rule of thumb is that the search window pull in is at least 5
pixels and is less than the reference window size divided by 5.
Suggested Number of Search Pixels is 21 sample pixels

CAUTION - Requesting very large search window pull in
Reference Window Size is 128 line pixels
Number of Search Pixels is 40 line pixels
The rule of thumb is that the search window pull in is at least 5
pixels and is less than the reference window size divided by 5.
Suggested Number of Search Pixels is 21 line pixels

Requested resolving shifts to 1/ 32 of a pixel

INFORMATION - you choose skips which are small for your window sizes
Normally the skip size is bigger than the box size
Across your skip is 99 but your window is 128
Down your skip is 924 but your window is 128
This means that the image chips are larger than the separation between chipsAt line = 5853
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
XXX time for inner loop 15.6950455
At line = 6777
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
XXX time for inner loop 15.7596283
At line = 7701
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
XXX time for inner loop 15.9808502

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At line = 36345
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
Bad match at level 1
XXX time for inner loop 15.0672607
Elapsed time. 634.106262
GDAL close: P349I250_slc/P349I250.slc.vrt
GDAL close: coregisteredSlc/coarse_coreg.slc.vrt

---

rgratio, azratio: 1.0 1.0

---

DEBUG %%%%%%%%
1109
DEBUG %%%%%%%%
2024-11-08 16:05:10,325 - isceobj.Location.OffsetField - INFO - 339 offsets culled

1-D calculation:

      Slope across  Intercept:

Across: -8.82109103E-04 2.50809312
Down: 2.27697135E-04 -4.27282476

60 points left
DEBUG %%%%%%%%
60
DEBUG %%%%%%%%
2024-11-08 16:05:10,329 - isceobj.Location.OffsetField - INFO - 0 offsets culled

1-D calculation:

      Slope across  Intercept:

Across: 1.29267210E-04 1.13520265
Down: 2.32465580E-04 -5.98970604

17 points left
DEBUG %%%%%%%%
17
DEBUG %%%%%%%%
2024-11-08 16:05:10,331 - isceobj.Location.OffsetField - INFO - 0 offsets culled

1-D calculation:

      Slope across  Intercept:

Across: 4.20962286E-04 1.46670210
Down: 3.12891352E-04 -7.42067003

7 points left
DEBUG %%%%%%%%
7
DEBUG %%%%%%%%
2024-11-08 16:05:10,333 - isceobj.Location.OffsetField - INFO - 0 offsets culled

1-D calculation:

      Slope across  Intercept:

Across: 1.15607120E-03 -0.492547482
Down: 5.57098072E-04 -11.3835640

1 points left
No chi squared value....
Try reducing rank of polynomial.
No chi squared value....
Try reducing rank of polynomial.
No chi squared value....
Try reducing rank of polynomial.
No chi squared value....
Try reducing rank of polynomial.
Estimated az shift: 1.03125
Estimated rg shift: 3.0625

<stripmapApp>
<component name="insar">
<property name="sensor name">ALOS</property>
<property name="range looks">4</property>
<property name="azimuth looks">16</property>
<component name="reference">
<catalog>reference.xml</catalog>
</component>
<component name="secondary">
<catalog>secondary.xml</catalog>
</component>
<property name="filter strength">0.7</property>
<property name="do unwrap">False</property>
<property name="unwrapper name">snaphu</property>
<property name="do split spectrum">False</property>
<property name="do dispersive">False</property>
</component>
</stripmapApp>

Please note, the number of looks in range and azimuth were included just prior to the interferogram step.
I will appreciate your feedback on this and thanks in advance..

[keepfighting666]

Hello, can you share you workflow, I have no idea to process ALOS 1 level 1.1 data. Thanks a lot.