I have a series of separate rasters which represent the cloud cover over the same area but in different months. Each raster has 2 values: nan for "no cloud" and 255 for "cloud". What i want to do is to create a single mask, where each pixel has a value of nan if ALL the separate rasters have nan as a value for that pixel, and a value of 255 if ANY raster (even only one is enough) has a value of 255 for that pixel. I'm using QGIS and I guess the raster calculator should be used for this, but I have no clue about how to do it and I've had no luck searching for solutions so far because I don't know how to even call the operation I'm trying to do. I tried to add the rasters but I got a weird result... Thank you in advance.
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