please check in the interferogram folder as well, as the error message is refering to this directory
You can share a screenshot of the contents of the ifg stack folder
here we have the source of the error - somehow the data 2020909 is cintained twice. Please check how this was caused.
I find this, in the back-geocoding phase,
I think, the problem came from the split phase, I will redo the beginning to confirm
very good, somehow it was placed twice in the stack of interefrograms which caused the error during the export.
Hello all,
I am trying to do the snaphu export.
I got a problem and tried to solve it and another error showed.
In the screenshot is the error.
Can anyone help me, please?
Thank you!!
$ snaphu -f snaphu.conf Phase_ifg_VV_17Jul2020_25Jan2021.snaphu.img 3180
snaphu v1.4.2
26 parameters input from file snaphu.conf (84 lines total)
only one tile–disregarding multiprocessor option
Reading wrapped phase from file Phase_ifg_VV_17Jul2020_25Jan2021.snaphu.img
No weight file specified. Assuming uniform weights
Reading correlation data from file coh_IW2_VV_17Jul2020_25Jan2021.snaphu.img
NaN or infinity found in correlation data
Abort
looks like the coherence was not exported during the snaphu export, which causes the script to stop.
Is it part of the product before the export?
Hello. two processes were involved: 1) write and 2) snaphu-export. After that, I started unwrapping the phase using the above command and I got this issue.
The product was after the snaphu export. These 4 files were present in the folder.
The coherence product was not present and I copied it from the write folder to the snaphu folder. Then, I run the command and I got the above error.
manually copying will not work. Please make sure to include the coherence estimation in the interferogram formation step and then run the snaphu export again.
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Thank you! it works!
can you please tell me, How to do it again?
I have used -
In first step -
Apply Orbit File - Back Geocoding - Enhanced spectral diversity - Interferogram - TOPSAR Debust - Write
In Second step -
TopoPhaseRemoval - Multilook - GoldsteinPhaseFiltering - Write & SnaphuExport
Thanks for you instant reply. @ABraun
just make sure that coherence computation is checked during the interferogram generation and that after debursting coherence is still part of the product. You can also include topographic phase removal directly in the interferogram generation.
Automating this within a graph makes sense if you want to repeat this step many times, but you lose control over the intermediate products. So please carefully check the outputs for correctness.
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I am getting coherence image for Difference Interferogram. I means it was checked but I need to do SNAPHUExport again.
if this is the input dataset for the snaphu export, both phase and coherence should actually be part of the exported files. Did you apply the snaphu export via the GUI or with a graph?
please try to use the Result of the “Write” operator of this graph as input for the snaphu export in the GUI instead.
I don’t know GUI commands.
GUI means graphical user interface
So you use the tool manually, outside the graph builder.
not in the graph builder, use it from the menu.
Use the output product of your second graph as input and define a target folder (copy it into the text field to avoid the error message) and click “Run”