DEM Assisted Coregistration, Artifacts

Microwave Toolbox
1

Hi there

I’m working right now with the StripMap Modus (S6) of Piton de la Fournaise:
S1A_S6_SLC__1SDV_20151115T145246_20151115T145310_008616_00C3BE_D7E0
S1A_S6_SLC__1SDV_20151127T145246_20151127T145310_008791_00C89D_8F9C
SNAP 3.0.2
Windows 7 with 32GB RAM

I tried the DEM Assisted Coreg, but I get some artifacts:
I tried the srtm1 and srtm3 when coregistrating --> The result: this artifacts are only displayed in the coregisteres slave image!
When I do the Interferogram, TopoPhaseRemoval, Filtering etc. the artifacts will still remain…

I mean, I can also perform the standard “coregistration”, but I guess the DEM Assistant Ccoregistration is more desirable, if I want to work with SRTM1

Here are some examples, may be one of you guys ran already into this problem:

Kind regards

Don

2

Increase the tile overlap % to 100% should remove these artifacts

3

@lveci what is the meaning of the tile overlap? Or in other words what is the most safe value to be used in an operational scenario?

Thanks for your help!

4

Sorry, it’s not a tile overlap, it’s a DEM tile extension. Given the currently target data tile to process in the SAR domain, SNAP requests a DEM area in the DEM domain. If there is high elevation it’s possible that not enough of DEM was requested and we see these triangle artifacts. Using 100% will extend the DEM request by 100% of the size of the current tile to process.

5

Sorry, I have the same problem
also by using the tile extension of 100%.
Any news about this issue? Thanks in advance