How to prepare Sentinel-1 images stack for PSI/SBAS in SNAP

ABraun · November 20, 2018, 4:55pm

I didn’t find one to be honest. All plots created with ‘v’ only show the average displacement so you might in fact need to derive it from the unwrapped phase (‘u-dmos’ is the unwrapped phase minus dem error, AOE, orbital ramps and topo-correlated atmosphere)

zhuhaxixiong · November 21, 2018, 6:34am

I have finieshed all the process in this part and get a displacement with 10 infer image,now i want to add the data to 30 image, when i do he step(ifg),the process is really long and when i get to about 70% of inter, an error occurs.i want to know the reason,first i think it is becasue the too manny images,may i need to creat two more stack to process,can you give some advice

ABraun · November 21, 2018, 6:51am

What’s the error message?

SSSumi · November 21, 2018, 6:58am

Hi, ABraun, thanks for your suggestion.I will try it.

zhuhaxixiong · November 21, 2018, 7:07am

i forget it ,because the inf process stay almost 6 hours,and the error occurs,how can you process data (over 20 imgas),do i need two creat two more stack?

ABraun · November 21, 2018, 7:12am

As I said, I do not know if it works if you split the data into separate stacks and I haven’t tested it.

Maybe you have access to a computer with more processing power to run it there.
Besides that, I can only recommend the snap2stamps tool again, which does all the data preparation for you after you modified the config files. Snap2stamps package: a free tool to automate the SNAP-StaMPS Workflow

zhuhaxixiong · November 21, 2018, 7:15am

thanks a lot,i am trying to create two stacks to process,and i dont know how to use the tools you have shared to me

ABraun · November 21, 2018, 7:17am

these are simple python scripts. You need to have python installed and write in the config file where your master and slave data are located and then call the scripts.
A user manual is contained in the download.

The end is the prepared dataset which is then used for PS processing.

zhuhaxixiong · November 21, 2018, 7:26am

thanks a lot but i found it is a little difficult

ABraun · November 21, 2018, 7:27am

the great advantage is that you can go sure that the result is ready for PS InSAR processing while working with several stacks could still lead to some errors at a later step.
Plus, it processes the files separately, so it might also be more efficient regarding your system’s capacities.

zhuhaxixiong · November 21, 2018, 7:28am

ok i will try it

zhuhaxixiong · November 21, 2018, 7:50am

it seems in the manual of the tools ,i need to use linux OS instead of windows,am I ?

ABraun · November 21, 2018, 8:00am

no, it works under Windows as well. You only have to switch to Linux afterwards. If you have questions on this tool, please use the mentioned topic to keep the discussions clean.

gabrielaquintana77 · November 22, 2018, 7:05pm

Hi all @thho @ABraun @Fikretjfm

Somebody know why I get this message when I want run the script mt prep gamma???!!!
200 does not exist, exiting

Thanks for advance

ABraun · November 22, 2018, 7:17pm

try to rename the folder “processed data” to “processed_data” and run again. It could be that the script expects the variables in the exact number and order and the whitespace caused the error.

gabrielaquintana77 · November 22, 2018, 7:34pm

Thanks @ABraun, now is running!!!

ABraun · November 22, 2018, 7:38pm

good job!
Getting into StaMPS and its preprocessing takes its time, but the possibilities and results are quite rewarding.

gabrielaquintana77 · November 22, 2018, 7:42pm

I need new results!!!

thho · November 22, 2018, 8:13pm

Another way to avoid this problem is to pass the path-string in quotation marks, or use \ before the white space to escape it, this can also be used in order to escape signs like $ which do have other meanings in shell scripts…anyway avoiding white space and special sings in file and directory names is always recommend.