For the Water Yield model, I derived reference evapotranspiration using the Thornthwaite method based on monthly minimum and maximum temperature data from WorldClim (CRU-TS). Monthly ETP was calculated and corrected using latitude-dependent monthly correction factors, and then aggregated to annual ETP. Finally, I generated a multiyear mean ETP raster (2010–2024) to represent long-term average climatic conditions consistent with the land use map used in the model. I want to know if what I did was correct.
That sounds right to me!
~ Stacie