Hi there,
I know this probably seems like a very simple question and I am embarressed to have to ask it, but I have having problems opening ALOS PALSAR data in SNAP.
I downloaded some ALOS PALSAR L1 data (in FBS SLC format) from the ESA On the fly service). My goal is to conduct offset tracking between two scenes. I have tried following the steps on the "Orthorectifcation of ALOS PALSAR tutorial http://sentinel1.s3.amazonaws.com/docs/ALOS%20PALSAR%20Orthorectification%20Tutorial.pdf) but I seem to get an error at the first step.
When I try to open the file by selecting the VOL file within the CEOS directory I get this error message
Yes I did use that import option (see screenshots). The zip file and the extracted folder are both 2.01 GB in size. Could it have something to do with the length of the files being too long?
hm, that looks fine actually, the file size is also reasonable.
Can’t think of a reason why it’s not working.
I would try it by myself but I am not registered as an ALOS on-the-fly service user.
Could you please check if the scene is also available here: https://vertex.daac.asf.alaska.edu/
Thank you for the continued help! It’s not on that website no. but I’ve uploaded one of the images onto our server. If you go to https://dropoff.soton.ac.uk/ and use Claim ID: Awedz7CKGkzZwutp
Claim Passcode: khb9xeBes2YMqwWs
SLC means that phase information is included besides intensities and your data is still in slant geometry.
For offset-tracking GEC data could be sufficient as long as the resampling didn’t destroy all of the texture information which is needed for the cross-correlation.
Please also see here:
I’ll have to try if i experience similar issues with my ALOS data.
Edit: The ones (ALOS FineBeam Dual, SLC) I retrieved from ESA as Third-Party-mission data work fine in SNAP.
Hi Richard,
I still haven’t fixed it. I spoke to ESA and they said a future release will fix this error (or maybe a future adaption of the on the fly products) but nothing yet.