Le 14/05/2016 11:28, Alessandro Amici a écrit :
the internal structure of the single SLC subswath is where the real mess starts. The tiff in the measurement folder are not actual images, but are a container of tiles with black borders separating them. In the metadata there are all the information on how to cut the non overlapping tiles and how to rebuild them into a standard subswath image. Furthermore some metadata, like the GCP info are given in a weird and barely documented format. I don't know all the details as a colleague worked on that, but I think you need to process the GCP line/sample numbers for the recomposed image.
Thanks a lot for all those comments. I just want to give my opinion on the SLC products with bursts (not all the acquisition modes produce this I think). In such products, you have black separator lines (and it is quite funny to note that GCPs from metadata actually fall within those lines !) and acquisition time overlap between bursts. IMHO, how to deal with those product is the advanced SAR user problem, and gdal should not do anything about it. Trying to workaround the problem could even prevent users from doing things with those data : for instance, in the overlap area you have two independent measurements of the backscatter for the corresponding cell, which is surely an interesting information to use.
Julien -- Julien MICHEL CNES - DCT/SI/AP
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