NDVI-processing problem

[marpet]

Does Luis answer help you?

TOPS "Create Subset"

You should not create subsets of burst data. Use the TOPS split to select your desired subswath and then apply orbit correction, TOPS coregistration, interferogram and TOPS Deburst. After the deburst you may apply subset if you want.

In addition I see there are SNAP updates waiting for installation. You should apply them. Just click on the little globe with the arrow in the lower right corner.