Error running "run_04_refineSecondaryTiming" for ALOS1 stack.

[Dani-Lindsay]

Discussed in https://github.com/isce-framework/isce2/discussions/380

^{Originally posted by **Dani-Lindsay** November 5, 2021} Hi there, I am using stackStripMap.py to generate a ALOS-1 stack and am having trouble running "run_04_refineSecondaryTiming" with stripmapWrapper.py -c /global/scratch/users/daniellelindsay/CC_ALOS1/proc/201A/configs/config_refineSecondaryTiming_20060905_20061206. I keep getting the error below... ``` 2021-11-05 14:02:34,297 - isceobj.Location.OffsetField - INFO - 0 offsets culled Error. Trying to allocate zero size array Traceback (most recent call last): File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/share/isce2/stripmapStack/stripmapWrapper.py", line 155, in main(args.start,args.end) File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/share/isce2/stripmapStack/stripmapWrapper.py", line 146, in main cfgParser.runCmd() File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/share/isce2/stripmapStack/stripmapWrapper.py", line 51, in runCmd func_modules.main(self.funcParams[section]) File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/share/isce2/stripmapStack/refineSecondaryTiming.py", line 221, in main shifts, cull = fitOffsets(field,azazOrder=inps.azazorder, File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/share/isce2/stripmapStack/refineSecondaryTiming.py", line 149, in fitOffsets objOff.offoutliers() File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/lib/python3.8/site-packages/isce/components/isceobj/Util/Offoutliers.py", line 87, in offoutliers self.allocateArrays() File "/global/home/users/daniellelindsay/.conda/envs/isce2_3.8/lib/python3.8/site-packages/isce/components/isceobj/Util/Offoutliers.py", line 191, in allocateArrays raise Exception Exception ``` I am running the jobs using GNU parallel on an hpc system, however if I also just try running each line individually (adding #!/bin/bash at the top of the cmd file and make executable) I get the same error. ``` parallel < run_files/run_04_refineSecondaryTiming &> logs/run_04.log ``` If anyone has suggestions for input parameters or something I could try to fix this I would be very appreciative. Attached are my log files. [run_01.log](https://github.com/isce-framework/isce2/files/7488996/run_01.log) [run_02.log](https://github.com/isce-framework/isce2/files/7488997/run_02.log) [run_03.log](https://github.com/isce-framework/isce2/files/7488998/run_03.log) [run_04.log](https://github.com/isce-framework/isce2/files/7488999/run_04.log) [run_05.log](https://github.com/isce-framework/isce2/files/7489000/run_05.log) [run_06.log](https://github.com/isce-framework/isce2/files/7489001/run_06.log) [run_07.log](https://github.com/isce-framework/isce2/files/7489002/run_07.log) [run_08.log](https://github.com/isce-framework/isce2/files/7489003/run_08.log)

[piyushrpt]

Make sure that the images you are trying to create a stack that covers your AOI are from the same track. This error essentially means it found zero matches to tie the images. Either the scene being used is not from the same track or frame. Use mdx.py to look at the SLCs for those dates to make sure they look correct.

[Dani-Lindsay]

This was exactly the problem, thank you! I downloaded the data with ssara and forgot to visually inspect. Even though they have the same track and frame numbers there is one date which doesn't overlap with the others.

[zhuhaxixiong]

I also get the error when do run_04_refineSecondaryTiming of ALOS1 stack ,but my data wa cover the same region