Selection of pairs of Sentinel-1 images for DInSAR processing

[gregss]

Hi,
i am interested to DInSAR processing.
I would like to have more informations about the procedures to select and download pairs of images suitable for Differential Interferometry.
Is there any tutorial?
Thanks

[ABraun]

About the selection of images

Interfremetric pairs for DEM generation

Firstly, they need to be of the same track (relative orbit), that means they must cover the same area, at least in range direction. Images which only partly cover the same are (perpendicular to the flight direction) can not serve as pairs for interferometry. Secondly, for DEM generation small temporal baselines should be preferred. A pair of Sentinel-1A and B can be 6 days apart at minimum. A pair of 2 Sentinel-1A scenes is 12 days apart at minimum. The longer the time between the images the h…

A tutorial is given here
https://saredu.dlr.de/unit/insar_deformation
It is based on NEST so some parts of the GUI look a bit different now but in general these are your required steps.

[swatishree]

Sir,
I am having pair of data, dated 01/10/2016 and 18/02/2017 (DUAL POLARISATION) .Can this be used for interferometry?

Also. i have polarimetric data of dates 02/04/2016 and 28/05/2016. Please tell whether any of these can be used for interferometry for dem generation.

Thanks

[mengdahl]

Sir,
I am having pair of data, dated 01/10/2016 and 18/02/2017 (DUAL POLARISATION) .Can this be used for interferometry?

Also. i have polarimetric data of dates 02/04/2016 and 28/05/2016. Please tell whether any of these can be used for interferometry for dem generation.

Thanks

Impossible to say as it depends on orbit track, wavelength, land-cover type etc. Please study the InSAR tutorials & online courses so you gain more understanding into SAR interferometry.

[ABraun]

as already often mentioned, this topic is a good start for all kinds of questions regarding DEM generation:

The Order of DEM Creating Steps

I am trying to create a DEM over my AOI. After reading plenty of topics, I have obtained a pair of S1A and S1B data. The baseline is 143.48 which is the longest I could find. As I read, it should be between 150 and 300 and around 70% of the values in the coherence histogram should be above 0.4. This is the histogram of my recent and best attempt. [image] After applying the steps below; 1) S1 TOPS Coregistration 2) Creating Interferogram 3) Debursting 4) Goldenstein Phase Filtering 5) Mu…

[Jennifer]

I have a query… The displacement map which i have obtained using DInSAR technique has values ranging from +1.05 to -1.006. How should i infer it??

[falahfakhri]

Have a look at these threads,

Displacement map

Negative an positive signs

Subsidence and Uplift

Subsidence and Uplift calculations

[yang121]

If the relative orbits are the same, can you understand that the incident angles of a study are the same? Thank you！

[ABraun]

this depends on the perpendicular baseline, if the angle is identical, InSAR would not be possible.