Interferogram averaging for DEM generation


#21

Thank you, no problem


#22

Is there a chance to make interferograms out of slave products in a stack?
I made a stack with 1 master and 12 slaves and then made image pairs
master-slave1
slave1-slave2
slave2-slave3

But the interferogram operator doesn’t work for the slave-pairs, it generates no output. I tried to rename one of them mst istead of slv08 for instance but this also didn’t bring any change.

I would like to make interferograms of short temporal baselines which are are alreay in the same geometry.


#23

This is something that SNAP does not yet support, but it is a high-priority development in the near future. @mfitrzyk


#24

that would be very nice.
So there is also no workaround at the moment? I tried to split the stack and then stack image pairs manually but they don’t seem to be recognized as an input for the interferogram generation after that.


Cannot open img - snaphu
#25

Is there a way to select an ideal master of many Sentinel-1 SLC scenes for a (one master) stack? The Coregistration overview does only work for non-TOPS products and I would like to select the one with suitable baseline conditions to all other scenes.

Edit: Nevermind - the InSAR stack overview does it. If someone knows a tool which computes the baseline graph as well, I’m interested :slight_smile:


#26

@ABraun what do you mean with “baseline graph”?


#27

This :slight_smile:


#28

yes, that would be nice. Or at least some way to export the table from the stack overview.


#29

Well, I don’t know if it’s the right place but in general, It would be a good SNAP QoL improvement to have a button “copy to clipboard” for any displayed data/tables


#30

That’s an excellent idea!


#31

I realize I’m jumping in on a thread that might be stale, but what @ABraun describes regarding pairing slaves to form interferograms is exactly what I need at the moment. Is there a timeline for such a capability?

Thanks for any advice, in general, I’m grateful for what SNAP provides.


#32

Hi ABraun,
I’m trying to average interferograms, creating according to “Create a DEM using Sentinel-1 Data” reciepe. So, as far as I understand, you’ve stacked unwrapped interferograms after snaphu import. Which tool have you used? Radar - Coregistration - Stack Tools - Create Stack doesn’t work because of “Phase band should not be selected for co-registration” error.


#33

I’m not sure if averaging them before unwrappng might make more sense because the fringes are still present and could be pronounced by the averaging. But I don’t know if snaphu takes anything besides the exported interferogram.


#34

I’m following these steps for a series of S1 SLC IW data (M-S1, M-S2 and so on)

And then I want to do:

Is it a right way to create interferograms stack or may be I missing something?


#35

give it a try!


#36

That’s what my question about. I can’t create stack from imported unwrapped interferograms. I use “Create stack” from Radar - Coregistration - Stack Tools, but receive a mesage “Phase band should not be selected for co-registration” error. What tool did you use for interferograms stacking?


#37

just look above :slight_smile: Interferogram averaging for DEM generation

coregister all images to one master and then stack them with coregistration > create stack.