Difference between vertical and LOS displacement

seismo · December 17, 2018, 4:18pm

Thank you for your time and reply.

Is there any plugin in the SNAP to convert LOS displacement to three components (NS,EW,UP/DOWN)?

ABraun · December 17, 2018, 5:11pm

I don’t think so.

seismo · December 18, 2018, 12:02pm

Thank you!

Cheers

mengdahl · December 18, 2018, 2:21pm

We could add it in the future from ascending/descending analysis.

Duoc · December 19, 2018, 2:53am

Dear @johngan,
The your results in LOS geometry is nice, I am new in PSInSAR technique.
Can you share for me and formun the proscessing that you run subsidence for the area of Ho Chi Minh in Viet Nam.
It is necessaryfor me and my thesis.

Thank you so much.

ABraun · December 19, 2018, 8:12am

please have a look here: About the STaMPS category

Duoc · December 20, 2018, 5:03am

Thank you @ABraun
I try do this tutorial but I have problem with Step 2 (like figure).
Do you have idea to reslove this problem?

Thank you in advance.

ABraun · December 20, 2018, 5:47am

I don’t know, sorry

Duoc · December 20, 2018, 5:47am

Thank you ABraun

mdelgado · December 20, 2018, 7:50am

Can you debug a bit and see the value of the variables which are giving the error? As you get exact information on file and line giving the error… you may try to do some debugging.

Normally this might be due to invalid values such 0 or NaN used as indexes… so maybe you can filtering them out.

Give a try and let us know

Duoc · December 27, 2018, 3:20am

Dear @mdelgado

Thank you your advice,
I try tocheck step by step in SNAP and StaMPS (Stamps.log), but I am not sure but I do not see 0 value or NaN value.
Can you see figure and do you have idead for this problem?

This is file about “20171113.lat.par”,

“Stamps.log”

Step1_stamps

Step 2_stamps

Best regards.

Duoc · December 27, 2018, 3:26am

This is mt_prep_snap

mdelgado · December 27, 2018, 3:41pm

You should not only look at the StaMPS log. Try to load any variable such as pscands.ij or similar and search 0 or NaNs inside.

Duoc · December 28, 2018, 2:47am

Dear @mdelgado,
I have checked pscands.1.ịj, pscands.1.da, pscands.1.ij0, but they do not have 0 or NaNs value and “pscands.1.ij0” does not value, does right?

mdelgado · December 28, 2018, 4:51pm

Well, I am running out of ideas then.
Had you visually checked the interferograms to verify that all look ok?

Let us know

gomalhunzai · April 13, 2019, 3:56pm

@ABraun @falahfakhri @johngan can you please sort out how this is done using SNAP?
Is it possible to use 20 pairs (A+B), (B+C) , (C+D) … so on which will produce separate stack for each pair and also separate interfergram. So my query is about how we can produce stack of all these interferograms at this stage for performing a time-series analysis?

falahfakhri · April 13, 2019, 4:35pm

Please take a look at this topic,

gomalhunzai · April 13, 2019, 7:12pm

Thanks @falahfakhri, i read all the conversation btw u and andy.
At the end of the day we dont have any perfect methodology on which we rely.
What if we calculate the subsidence using No.of pairs (A+B, B+C, C+D, …) till last step (displacement) separately and averaged the results of all displacement layers.

ABraun · April 13, 2019, 8:02pm

Currently, this is the best option available. You can also plot the displacements of the single dates (pairs) of a pixel along a graph.
An example is given at the end of these slides: https://eo-college.org/resources/insar_deformation/

gomalhunzai · April 13, 2019, 8:15pm

i am affraid there is no pdf available for deformation