Any solution for this knock out?

Hi

I thought Select focus might help - it doesn't.

So next I tried bit of lateral thinking. Taking a copy of the image and using Find edges followed by Gaussian blur then using a black and white layer adjustment plus a curve to invert gave a starting point for a mask. The top edge of the land needs to be brushed over as do some lines around the farm and some holes at the bottom.

A couple of minutes with the brush to brush out the obvious areas gave this:

Then making the result a mask :

How much work it still needs to finish it depends on what you are using it against. I would not finish it until I had it in the new composite.

Dave