Cloud Scene Simulation Modeling
Scientific rept. no. 1
ANALYTIC SCIENCES CORP READING MA
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This study documents the development of the Prototype and Interim versions of the Cloud Scene Simulation Model developed for Phillips Laboratory in support of the Smart Weapons Operability Enhancement Program under the Balanced Technology Initiative. The model simulates multi-dimensional cloud water density fields using stochastic field generation techniques the sawtooth wave and successive random additions fractal algorithms and knowledge of atmospheric structure for input to radiative transfer models and scene generation systems. Two auxiliary post-processor programs are also described. The first generates a two-dimensional shadow map from a cloud field as a function of solar position. The second converts a gridded field to a colored polygonal isosurface for use in scene visualization. Included are the results of a comparison of model produced and observed liquid water density statistics along paths through clouds of various types using data provided by the FAA. Plans for further model development Including the addition of a cumuliform model are described.
- Computer Programming and Software