I am encountering a bug with S1-Tops Back-Geocoding in Snap 7.0. I get the following error message when I want to coregister more than one slave simultaneously to the master and have the Output Deramp/Demod Phase Option enabled:
The Product ‘S1B_20161025T224444_20161025T224512_20161025T224509_20161025T224536_Orb_Asm_IW1_Stack’ already contains a band with the name ‘derampDemodPhase_mst_25Oct2016’.
The error disappears when only adding one slave (see below).
I’m still having issues with this. I am trying to backgeocode five images w/ deramp-demod so that I can apply ESD later on. But when I toggle that option on it throws an error - the same error mention herein.
We have tried to repeat it the problem on our computer but couldn’t. Could you please provide more details regarding your test, such as the version of SNAP, the product names and the processing steps etc? Thanks
After loading the images, I split each of them as I’m only interested in subswath 1 (IW1) and bursts 8-9. I then apply orbit file to precise orbit to each of the split products. Then I go to co-reg the 5 images using S1 TOPS backgeocoding (placing my desired master at the top of the list) - I want the deramp/demod so I can apply ESD later since I have multiple bursts in each SLC image. When I go click the deramp/demod option it complains and gives the noted error ("… **already contains a band with the name ‘derampDemodPhase…").
Then I thought it could an issues related to applying the split before the orbit file step. So I repeated the procedure applying the orbit file step prior to the TOPS split operation - same issue when I go to coreg the images.
Lastly, when you repeat the above steps for a 2 image stack (as opposed to 5 images), things work just fine. The issue with the demod/deramp option toggled on doesn’t throw off the error.
We have tried your data and procedure with both SNAP v7.0.0 and the latest build on our computer, but still cannot repeat the problem. Could you do an update to your SNAP and build it again to see if you still have the problem? Thanks
The SNAP installed on my computer was downloaded from http://step.esa.int/main/download/snap-download/ and worked fine with your data and procedure. You can use this version (v7.0). If you built SNAP from source code, could you check the source code in BackgeocodingOp.java from line 335 to line 344 to see if they are the follows?
if (outputDerampDemodPhase) {
final Band mstPhaseBand = new Band(
“derampDemodPhase” + mstSuffix,
ProductData.TYPE_FLOAT32,
masterBandWidth,
masterBandHeight);
Hi,
I am also still facing this problem. I cannot check the source code at the moment as i cant access my server, but I definitely updated snap to v7 after you said you fixed the issue.