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In February 2005 a joint atmospheric propagation experiment was conducted between the Australian Defence Science and Technology Organisation and the University of Central Florida. A Gaussian beam was propagated along a horizontal 1500 m path near the ground. Scintillation was measured simultaneously at three receivers of diameters 1, 5, and 13 mm. Scintillation theory combined with a numerical scheme was used to infer the structure constant [C.sup.2.sub.n], the inner scale [l.sub.0], and the outer scale [L.sub.0] from the optical measurements. At the same time, [C.sup.2.sub.n] measurements were taken by a commercial scintillometer, set up parallel to the optical path. The [C.sup.2.sub.n] values from the inferred scheme and the commercial scintillometer predict the same behavior, but the inferred scheme consistently gives slightly smaller [C.sup.2.sub.n] values. OCIS codes: 010.1290, 010.1300, 290.5930.