So we can have a little brainstorm here. Correct me if im wrong ofc.
We see the first visible establisting shot of the battle fielf in the first image.
Its a clear weather if we assume that the day passed a bit from the morning when the troopers first see the AT-ATs in the fog.
Also i know ady may take care already that just now with Serji-X's help we can have a more complete view of the field
-Angel