A weather theme is a collection of meteorological data that Flight Simulator uses to render weather visuals (clouds, precipitation, fog) and modify an aircraft’s flight model (temperature, wind, icing). The data is stored in a regular grid of weather observations where each observation affects an area of 256 square kilometers (16km on each side). Weather themes can contain a single observation or be as large as 64x64 grid cells. This means that you can create a rich, dynamic weather experience that covers an area of over a million square kilometers.
This SDK describes how to create and distribute weather themes for Microsoft Flight Simulator 2004: A Century of Flight using a special theme creation tool.
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