Well looking from the 2D view it looks like a curved line, atleast from my device, haha it could be that, however something travelling across contour lines would be a lot less straight simply due to the nature of the surface. It could be a number of factors, such as terrain and so forth. I think it has to do a lot with the shape of the object acually. Such as a wing digging into the left side causing it to veer left.

Yep I saw the ring. The general consensus as far as I've studied up on the object is that it is an avalanche, although I dont understand how an avalanche can cause an almost perfect trail mark like that, its an interesting find thats for sure!