I’m wondering if anyone did something like this and if not, perhaps some suggestions to get started. Our astronomical observatory is close to the shore and at time we have heavy surf, which is picked up by our Raspberry Shake (and the reason we got one). We want to add a field to an images FITS header that give an indication of the surf ‘noise’ that may have contributed to that image. Is it possible to calculate something like the RMS for the last, say 10mins? Or would some other parameter be better? How would I extract that data from the Shake?