NCALM Seed. PI: Kenneth Befus, University of Texas at Austin. The survey area consisted of a rectangular polygon on the Solfatara Plateau within Yellowstone National Park, WY. The polygon encloses about 56 square km. The survey required 2 flights due to smoke from a wildfire that cut the first flight short: the first took place on August 25, 2012 and the second on September 3, 2012.