I have a question that can solve a lot of trouble, why not change or add a new command in ArcGIS to add raster in mosaic where you can manual set the band as parameter? Like that we could build toolbox and improve custom mosaic with an easy way. That could be really useful for all who are in institution where ArcGIS version isn't correctly deployed (we still in 10.3.1 for my institution...) That could be really nice and avoid for some us to look at other product just because we can't do the job in ArcGIS in less than 10 minutes as it's when you get have the tool. I can understand that ESRI like to get hand on most of the code but I think this improvement can be interesting for all member of the community and help to provide support for a lot of product like Sentinel L2A L2B or L3A product.
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