Hi @lorenzo.minola ,
You are correct that you will need to reproduce the table you see in the default WW3 dataset. Specifically, you will need data for the 5 variables (16 sectors each) that are described in Appendix B. The details for calculating each variable are given in that same appendix section.
The equations in the “Wind Exposure” and “Wave Exposure” sections of “How it Works” are different and should not be used to prepare the replacement WW3 data. These sections describe how the model uses the WW3 data.
Perhaps one point of confusion: The variables REI_VX and REI_PCTX do not actually represent REI values, rather they represent wind velocity statistics that will be used by the model to calculate REI.
Best,