In cinematic mode would like an auto generated background

I generally prefer an ISO type view for my maps…. To work effectly with your software, I record short Cinematic vids for my battle maps and large area maps. However as I 'pan back' often the view extends beyond the map area.
I would like the software to examine the last few squares of the map and extrapolate an appropriate back ground.
As an alternative, offer some generic options Farmland, Dessert, Mountains, leafy forest, pinetree forest, Plains etc.