ValueError: min() arg is an empty sequence

[svenborgstrom]

Good morning everybody,
I'm processing a S1 correlation stack (stackSentinel.py ...) in the run_files folder.
At "run_08_merge_burst_igram" I got the error:

topSwath = min(refSwaths, key = lambda x: x.sensingStart)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: min() arg is an empty sequence
(see also the attached file).

I saw in the forum as well to check if there was a similar post, it was there, but the post was closed without any fix.
About the merge burst step I must also say I previously changed the "stackSentinel.py" script at row 731 into
"runObj.igram_mergeBurst(acquisitionDates, safe_dict, pairs)" otherwise I couldn't have generated the run_files folder.
Any help to fix my issue would be greatly appreciated, thanks.
Sven.

[yunjunz]

I never used the correlation workflow. Based on the code, it seems that the runObj.burstIgram_mergeBurst() is NOT defined anywhere.

I guess replacing these lines from:

    i+=1
    runObj = run()
    runObj.configure(inps, 'run_{:02d}_merge_burst_igram'.format(i))
    runObj.burstIgram_mergeBurst(acquisitionDates, safe_dict, pairs)
    runObj.finalize()

to

    i+=1
    runObj = run()
    runObj.configure(inps, 'run_{:02d}_generate_burst_igram'.format(i))
    runObj.generate_burstIgram(acquisitionDates, safe_dict, pairs)
    runObj.finalize()

    i += 1
    runObj = run()
    runObj.configure(inps, 'run_{:02d}_merge_burst_igram'.format(i))
    runObj.igram_mergeBurst(acquisitionDates, safe_dict, pairs)
    runObj.finalize()

would fix the issue.

Another way around this is to use the interferogram workflow if you are more familiar with it, which includes the correlation products already.

[svenborgstrom]

Many thanks Yunjun.
Problem fixed.
Sven.