This would be the infamous "grassy knoll"-where the conspiracy theorist like to say there was a second shooter.The X here represents where he was shot the sceond time.
The x directly in front is the second shot and if you look up the road to the left was the first shot.(to the right of where those two people are walking). Further up the road where you see the tree in the left of the picture to the left of the tree ( not in the picture) is the building he was shot at from.