I have to disapoint you. As I know this polygon was built according to the 1985's map + devs photos. But according to the map from 1941 there were much less trees in the north part of the map. About south part, just slightly less was in 1941 than now.
My problem with the town of Sokolovo portrayed in the game is that it looks like some of the American urban sub-divisions where the whole area is bulldozed and then the houses are added with the trees and bushes coming much later after people lived there for awhile, the town seems like it has no real character and reminds me of the fake urban town mock ups I trained in when I was in the Army.
The large town in the south of the Sokolovo map has some character but all the other towns on this map look like no one ever lived there or tended to their land, gardens or shade trees. I would think that this area had more vegetation that wouldn't be of tactical interest and probably not deemed necessary to project on the original scale map of that era but may have been there anyways, but having never been there myself I'm sure I could be wrong.
Regardless, I find the map somewhat tedious and inhospitable as compared to the other maps that have large towns on them.
As a side note- There was a debate here in the United States about what Civil War battlefields looked like in the 1860's and how much time and effort should go into cutting the lawns and cleaning up the area that made them look less authentic to that era, but historians said that the areas in question were even more devoid of vegetation and trees due to the fact of grazing animals and the local population using trees for building, cooking and heating fuel.
This is not a political thread and I wish to keep it that way, but I suspect this winter in the Ukraine will see similar denuding of the local terrain as people fend for themselves to stay warm. I should have taken the same thing into account before I made my earlier statements about not enough vegetation, while considering that the Ukraine was the most fought over area of WW2 and had seen 3 years of constant warfare and changed hands numerous times during this period and I suspect the local population was utilizing what was immediately available.