GTI Forecast from DNI, GHI etc

#1

I have a regression model that uses the historical GTI with very good backtesting results. I want to use the regression coefficients to forecast AC output based on GTI, but this parameter is not provided in the forecast as it is in the historical dataset.
Question: how is GTI derived from the other parameters in the forecast dataset?

#2

I found a method that gets very close - the pvlib module. Results are close enough!

https://pvlib-python.readthedocs.io/en/stable/auto_examples/plot_ghi_transposition.html

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