As said in the description, it is from the NORDRAD project. As it includes different countries, there are definitely some legal questions as to why the composite “raw” data is not shared publicly. Nevertheless, I would encourage you to contact FMI directly (they have contact information available on their website), but I doubt they will share the composite file. Still, you never know.
Yes, I wrote them, but they don’t have the nordic composite as open data. Only the finish composite.
Well, then I might have to think about how I could create my own nordic composite with the finish, swedish and norwegian radar composite. Is that a hard thing to do as I have never done that?