Dear Sir,
I am writing to seek your advice on the setting of four parameters: tscold_min, tscold_max, ndvihot_low, and ndvihot_high. Despite reviewing a considerable number of relevant literatures, I still struggle to understand the specific methods for setting these parameters. Therefore, I would greatly appreciate your guidance and any feasible solutions you might suggest. Thank you for your time and trouble.
Currently, when I use the default parameters to calculate ETa data and validate it against the GLEAM product data, the R-squared value is only 0.2, which is not ideal. I suspect that the issue may lie in the setting of these four parameters, but I am unable to find a direction for adjustment. I would be very grateful for your invaluable insights.
Thank you again for taking the time to read this message. I look forward to your guidance.