Solution 2 deploys a ground meteorological station to collect wind speed data, which is then utilized to apply directional corrections to the drone while in ight. Solution 2 typically ies multiple ight planes within the facility to estimate emissions from subsets of equipment; the total facility estimate is the sum of all subsets. While each ux plane is completed in 20-40 minutes, it takes several hours to collect a full-facility estimate when measuring multiple subsets of the facility.