Kamasani,

Can you please explain by what do you mean "better"? Do you mean faster computation time, better prediction or categorization?

At any rate, I think you might need to review Support Vector Machine as a machine learning technique.

You can use Guzman et al., (2015) as a reference for comparison

https://elibrary.asabe.org/abstract.asp?aid=45795&t=2&redir=&redirType=

Mohamed

Thank you for answering Mr.Mohamed. here "better" means good correlation between predicted and measured Reference Evapotranspiration values. I mean better prediction method.

Your derived equation will be very specific to the area where the data came from and will be 100% emperical. The current equations are at least partially based on mechanistic methods; i.e. an energy balance.