![]() ![]() On the other hand, Olive Tree Labs OTL Suite software provides the wave-length effects needed to accurately calculate and model ground reflections, and is computationally practical to model large industrial facilities. Full-wave software, such as Greens Function-Parabolic Equation calculates wave length-effects, and is nominally exact, but too computationally intensive for modeling large-scale industrial facilities. For example, at 100 m, a 100-m high stack has an angle of incidence of 45°, which is much far higher than grazing incidence. ![]() It is presumed that ground effects calculated using 9613 are generally accurate for grazing incidence of a ray to the ground, but their use at large angles of incidence and taller sources is of lesser but unknown accuracy. While ray-tracing has been used successfully for designing industrial facilities, the accuracy of some empirical algorithms in 9613 is questionable. ![]() It is computationally practical for large-scale models. Ray-tracing software, which normally uses ISO 9613-2 to calculate outdoor sound propagation, is typically used to model community noise from large facilities. ![]()
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