I have a question about the input data required: does InVEST distinguish between reference and potential evapotranspiration (ET0 and ETp)? Or do you know if there are differences between ET0 and ETp, which will change my results?
The user guide explains that a raster representing reference evapotranspiration (ET0) is needed - our meteorological climate centre provides daily, monthly and yearly rasters showing potential evapotranspiration (ETp) over grass, which are calculated with the model AMBAV. This model still uses the Penman-Monteith equation, which, however, has been changed and expanded to reflect national climatic and soil-physical conditions. Therefore, I would like to use those rasters for the modelling.
Futhermore, the kc-calculator requires monthly ETp-values, which confuses me little bit.
Thank you very much!