In this investigation, methods used to generate combined drop size distributions, from discrete measurement points, are developed and evaluated. A hydraulic, at spray and an internally air-atomized, multi-ori ce spray are investigated experimentally; representing common but distinctly di erent sprays. The details of each spray plume are captured with an extensive matrix of measurement points, which are then used to evaluate the drop size distribution di erence across each spray plume, and to calculate combined drop size distributions throughout a planar cross-section of each spray. Weighted-average distributions are generated, using the local ux and discrete area at each measurement point, which are relevant physical characteristics within each spray plume. It was found previously by Bade and Schick [1] that measurements should be performed at approximately each 10% interval of the overall spray plume size in order to achieve errors less than 5% for combined spray plume statistics. Also, the measurements should be performed along both the x and y axis for a at spray, and along a single-axis from the center-to-edge for a multi-ori ce air-atomized spray for drop size investigations. The developed methods allow the logical combination of drop size distributions, collected at many points, to be used to generate holistic drop size distributions that are representative of a planar cross-section within a spray plume.