Dear Snap users,
I am needing to undertake some feature tracking of two glaciers in Iceland using Sentinel imagery. I have had the SNAP toolbox recommended to me and hope to use it to good effect.
I have been trying to work through the processing steps, following both the tutorial from ESA for Rink Glacier, as well as the tutorial from a webinar given earlier this month by RUS for Petermann Glacier (link: https://rus-training.eu/training/glacier-velocity-with-sentinel-1).
I am following these steps extremely closely, yet I have been unable thus far to obtain any sort of velocity output. I have been attempting to overcome these myself by reading through posts on the forum, and then retrying myself, but I am still stuck with the same issues.
Currently, my ‘best outcome’ has been a velocity map made up of randomly spaced squares, which obviously isn’t the outcome I need. I read on a post on this forum that I should check the geometric quality of my stack (using RGB) but have no idea how to do this - can any of you help?
Apart from this outcome, the other issue I have is that when I try to load the bands after undertaking the DEM-assisted coregistration nothing will load? Instead the screen where it should appear remains grey. I leave it to load for a while but still nothing. Any hints on why this may be occurring?
As I said, I am following the steps in both tutorials very closely (they are ever so slightly different but main steps are the same - apply orbit file > DEM > Subset > Offset Tracking. So I am struggling to see what I’m doing wrong?
I understand that I will need to play around with the parameters in the offset tracking stage as my glacier is much different to the ones in Greenland, but I do know it flows at max. 2m a day.
My computer has 16gb of RAM if that’s any help in answering the questions.
Thank you in advance.