This was taken by George N. Barnard. A description in Time Life's
Voices of the Civil War: Atlanta says that it was taken around the southern portion of the battlefield, where Polk's Corps was positioned. The town of Resaca can been seen to the left in the background and the Oostanaula River can just barely be seen behind it.
A couple more of the Resaca battlefield, also by Barnard. These may have been taken on the northern side of the battlefield, where most of the fighting was done. Supposedly the trees have been torn up by shot and shell.
https://www.flickr.com/photos/smu_cul_digitalcollections/8170378177/
https://www.flickr.com/photos/smu_cul_digitalcollections/8170378211/
Also, that painting in the second post is actually the "33rd Alabama Regiment, 1863" by Rodney Ramsey.
http://www.oldgloryprints.com/33rd Alabama Regiment - 1863.htm