Yes , I saw it and it’s great, but I’m going to do it without SNAP and do it in MATLAB . Is that possible ? Or must it be done in SNAP?
Well as this forum is about SNAP, I assumed you ask for a SNAP solution. I’m no expert with Matlab, sorry.
1 Like
Yes, you are right, thank you anyway.
ABraun I was skeptical about the result.
What does this output mean for coregistration?
is it correct?
still the same problem as you reported here: How to import an external DEM into SNAP? - #21 by Parisa
Parts of your second product are missing, but I don’t have an explanation why. It would make more sense that a single burst was missing, but the border diagonally crosses both bursts. Never seen that before. Please go back to the TOPS Split step and make sure that both inputs for the coregistration cover the same area.
I check TOPS Split and it’s True.
I think it 's because STRM doesn 't cover the whole area . how about this ?
so it can be said that the upper part is right, but not down here. Right?
If that’s the case ,I can separate a smaller image from the top and do the processing I want on it.
Then both parts would be missing in the output. Have you tried BackGeocoding using another DEM (AutoDownload)?
I tried BackGeocoding using external DEM (AutoDownload)?
I will check it again . then ill talk to you again .
thank you very much .
Hi ABraun
I didn 't find the previous problem.
Now I am asked how should I export the interfrograms I created?
I started with the “tif” format first, but it just gives me the pixel values of the images, I need the DEM, latitude and longitude data.
It is written in the “ُStaMPS_Manual.pdf” that stamps should be exported. Do I need to install new software?
Why do you want to export them?
For unwrapping, please us the snaphu export as described in the tutorials. Sentinel-1 TOPS interferometry
StaMPS processing is based on time-series and works entirely different. I think you are mixing two things up at the moment.
1 Like
No I don’t want for unwrapping.
Yes. I’m totally confused.
I want export interferogram and m-file of stamPS procesing Run on it.
now I have a question, I have seven pairs of Interferogram Phase and I don 't know how to get access to temporal baseline and perpendicular baseline!
If you want to use interferograms which were generated in SNAP for multi-temporal analyses in StaMPS, there is a separate export function. Please have a look at this topic: StaMPS - Detailed instructions - #2 by ABraun
You can use the InSAR Stack Overview tool to get the temporal and perpendicular baseline.
Yes, I’m looking now
Thank you very much.
Hi ABraun
I got temporal and perpendicular baseline with ASF Data search because I do not have access to Snap at this time.
I have to implement PSI algorithm, but apparently I am not allowed to use StaMPS package and I have to write the steps myself.
At this point I have to get incident angle and I have a question. For an image the incident angle of each pixel is different from other pixels of the same image or the whole image has a incident angle?
I created the interferograms In single master mode views, and according to the formulas, I conclude that the incident angle of each interferogram is equal to the incident angle of the Master image. Is this true?
the incidence angle of the pixels within a product varies across the range. You can see it in this figure
Source: Incidence angle normalization of Wide Swath SAR data for oceanographic applications
Additionally, you can distinguish between the global and the local incidence angle. The first refers to the flat surface of the earth and the second includes topography (more on this here)
So you have to decide which one you want to use. But if all images are from the same track you can use the incidence angles of the reference images.
1 Like
Hi ABraun
Thank you for your help and answers to my questions.
I encountered a problem in implementing one of the methods PSI.
In this method, I have to use Delaunay triangulation, and after doing this, I do not know if the two pixels connected by triangulation should be added together or subtracted.
Is there something I do not pay attention to?
First I detected the coherence pixels and then I connected them by triangulation
I don’t know that, sorry.
you’re welcome
Anyway, thank you
Hi ABraun
I am currently studying how to coregistration of images.
and I came across the topic of tie point, and I was asked if tie point is the same as corner reflector?
a corner reflector could be a tie-point, but one of many randomly identified. In SNAP you do not actively select reference points between images, they are generated during the coregistration and only those which are good matches between both images are kept.