I was taking a picture, as I like to do, and so did I this afternoon, of this fence, and when I checked how the photo came, I saw this white line with a kind of circle and a thing around. I doesn't seem to be coming from the ground, and it can't be a plain either. As the photo isn't the sharp when zooming in, it is hard to say what it is really. I didn't change anything on the photograph, I never do, I always keep my photos in the original as they have been taken.