This isn't really directed at you, more for clarity about my last post. Those are the specs for the north video screen (they come from cyclones.com as indicated in the url and the copyright at the bottom of 2010). The north board is 36.0 feet high and 79.2 feet wide with an aspect ration of 720x1584 with Daktronics 15HD pixel layout.
http://www.cyclones.com//pdf8/759494.pdf?DB_OEM_ID=10700
The only publicly available specs for the south video screen are that it is "approximately 36 feet high by 79 feet wide and will feature a 15HD pixel layout." From this press release by Daktronics:
http://www.daktronics.com/news/Pages/Iowa-State-Adding-to-Stadium-With-Daktronics.aspx
The summation that the two screens are identical size comes from three things; first, that Jamie has said they are the same size, from communicating with a friend who works at Daktronics that confirmed the two screens will be identical size, and from the logical inference that a video board that is listed as approximately 36' by 79' with the same pixel layout will be identical dimensions to the 36.0' by 79.2' board in the opposite endzone.