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Does anyone know how global winds and temperatures at an altitude are interpolated?

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Hello, everyone.


As of X-Plane 10.50, the global winds are projected using file "global_winds.grib". The file includes u-component and v-component of winds at altitudes 10K and 34K feet. Does anyone know how winds are interpolated between these two altitudes? Something like:




Or there is another algorithm?


Are winds extrapolated below 10K and above 34K feet?


I also noticed that X-Plane 11 does not include file "winds.rwx" anymore. That file included temperatures at various altitudes. How is temperature at an altitude now projected in X-Plane 11 without this file in US and outside of US?


Thank you so much in advance!

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