I have some issues in reprojecting SLSTR L1 dataset (S3A_SL_1_RBT).
(Sorry, I wasn’t sure if that topic is a generic SNAP one or a S3TBX instead. I have used SNAP since it is involving reprojection)
When using a graph which does a single full dataset read + reprojection, the output image visually looks like made of different stripes with a visible offset/shift between them.
See this image:
If I split the work in multiple pieces, by doing several operations composed of
read+subset (Y offset, 400 pixels height, fullswath) + reprojection
things are looking better.
This image depicts the same dataset being reprojected in chunks and finally reassembled with gdalbuildvrt and translated to tiff.
What do you think about that?
Is it a known issue? Do you have any feedback or suggestion?
I haven’t seen this outcome before, thanks for reporting. Can you tell me which reader you used?
I have used the SlstrLevel1B500mProductReader (I have temporarily disabled the 1km reader to make sure it use the 500m. Thanks to your reply in the other topic, I will force the formatName to 500m).
In case you need it, this is the graph I have setup:
PS: Sorry I didn’t understand how to indent the code. When I have pasted it it was containing 4 spaces indentations.
I did reformat your post.
did you have any chance to take a look on that issue?
sorry for letting you wait. We’ll investigagte and come back to you about this.
we now investigated this in detail and found that the shifts after reprojection in SLSTR are caused by approximations (to find the geo-position) which where not properly initialised. This is now fixed.
Thanks for this report