CD workflow in phases

Microwave Toolbox
#1

I want to do Change Detection on a library of bursts (that all have the same footprint), which would be ~30 times smaller than the corresponding library of full S1 files.

For full S1 files, my normal S1 CD workflow is this:
Capture

It seems like it should be possible to separate this into two steps - one that splits out the bursts of interest from the large files, thus creating the burst library:
image

Followed by one that operates on the bursts in the library to do the CD:

image
image.png691×250 37.5 KB

However, when I try this, the back-geocoded secondary image is always filled with NaNs. Others on this forum have reported similar problems, but I can’t track down why this might be the case - it happens with various kinds and resolutions of DEMs, all of which are being successfully downloaded.

So is there some basic reason why back geocoding won’t work with individual bursts?

Thanks,
Tom

#2

Think I found the fix. Doing it in two steps is fine, but TOPSAR Deburst should move from Step 1 to Step 2:

Step 1, wherein we build the library of bursts:
image

Step 2, wherein we do cool CD stuff:
image

#3

It might still be faster if you do terrain correction separately.