Accession Number : ADA256689


Title :   Cloud Scene Simulation Modeling


Descriptive Note : Scientific rept. no. 1


Corporate Author : ANALYTIC SCIENCES CORP READING MA


Personal Author(s) : Cianciolo, M E ; Hersh, J S ; Ramos-Johnson, M P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256689.pdf


Report Date : 20 Nov 1991


Pagination or Media Count : 82


Abstract : 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.


Descriptors :   *CLOUDS , *MODELS , DATA BASES , ALGORITHMS , TWO DIMENSIONAL , METEOROLOGICAL DATA , SAWTOOTH WAVEFORMS , COMPUTER GRAPHICS , WATER , LIQUIDS , FRACTALS , COMPUTERIZED SIMULATION


Subject Categories : Meteorology
      Computer Programming and Software


Distribution Statement : APPROVED FOR PUBLIC RELEASE