Testing Geogrid for my case: Facing some errors

[Sci123-lab]

Hi there,

I have installed ISCE2 and have autorift and geogrid all set. I have done initial processing to co-register Sentinel-1 pair (used 2 sub-swaths). Also, I have transformed DEM to the required format of the geogrid. The code I run for geogrid is as follows:

testGeogrid_ISCE.py -m /home/hassan/ISCE2-Tops/insar/merged/reference_grd.tif -s /home/hassan/ISCE2-Tops/insar/merged/secondary_grd.tif -d /home/hassan/ISCE2-Tops/insar/merged/dem_nztm.tif

based on instructions, I see that we should set -m -s as folders to co-registered SLC's. I am wondering what could be the problem. The folder "merged" contains all the files required for this step, i.e., reference and secondary slc's and their metadata.

The error i get is as follows:

Traceback (most recent call last):
File "/home/hassan/miniconda3/envs/isce2/lib/python3.8/site-packages/isce/applications/testGeogrid_ISCE.py", line 392, in
main()
File "/home/hassan/miniconda3/envs/isce2/lib/python3.8/site-packages/isce/applications/testGeogrid_ISCE.py", line 386, in main
metadata_m = loadMetadata(inps.indir_m)
File "/home/hassan/miniconda3/envs/isce2/lib/python3.8/site-packages/isce/applications/testGeogrid_ISCE.py", line 131, in loadMetadata
info.sensingStart = min([x.sensingStart for x in frames])
ValueError: min() arg is an empty sequence

Any advice?

[walking02]

I have the same problem, ask for help

[barely-sad-one]

Is it resolved? I'm also having this same error.

[Sci123-lab]

Hi.
I am also waiting to hear. Lets wait to hear from an expert

[barely-sad-one]

RESOLVED this perticular issue.

testGeogrid.py is trying to find some metadata in the Sentinel-2 raster's description metadata, but the raster I downloaded doesn’t include this information, which is causing the error.
It might be necessary to hardcode the time value, but I’m not entirely sure.

[Sci123-lab]

RESOLVED this perticular issue.

testGeogrid.py is trying to find some metadata in the Sentinel-2 raster's description metadata, but the raster I downloaded doesn’t include this information, which is causing the error. It might be necessary to hardcode the time value, but I’m not entirely sure.

OKAY. Well I am dealing with Sentinel-1 radar images and they do have their metadata always included in the .SAFE. Still Wondering

[CherishGY]

I am processing Sentinel-1 data using ISCE2 and AutoRIFT to calculate ice velocity, but I’m currently stuck on how to obtain the corresponding master.tif and slave.tif files. As in your example /home/hassan/ISCE2-Tops/insar/merged/reference_grd.tif, after running topsApp.py /mnt/h/Velocity/topsApp.xml --start=startup --end=denseoffsets, I only get files like reference.slc.full, reference.slc.full.aux.xml, reference.slc.full.vrt, reference.slc.full.xml, etc. According to some papers, processing only up to mergebursts is sufficient, in which case even the reference.slc.full file does not appear. I want to know how to generate master.tif, because in the latest version of AutoRIFT, testGeogrid.py requires two geocoded .tif files. I'm not sure how to handle this. Do you have any suggestions?

[Sci123-lab]

@CherishGY you are right. We don't get these files directly and one can convert to tif always, but it also doesn't solve the problem. It's more complicated than that.
I just used denseAmpcor to get my dense offsets. But I am still wondering to know the usability of autoRIFT for offset calculations using SAR images