Hi - please help me to finally understand the role of ETo in the UC model!
after referencing these other questions (the 2nd of which is mine)
- Doubts about urban cooling model
- Urban cooling: advice on scenario generation
- Reference evapotranspiration raster data
I read in the userguide :
- Reference evapotranspiration varies with elevation, latitude, humidity, and slope aspect
and i read at fao
- …reference evapotranspiration, denoted as ETo. The reference surface is a hypothetical grass reference crop etc etc
So whatever value I apply, whether its from a local rural site or within my urban location, it is likely to be a single value across my small (15km2) AOI. is that correct?
In that case when the normalized version is used for ETi, ETo/Etmax will always be 1 and Eti = kc
is that correct? But this makes it seem like Eto has no purpose!
So what am i misundestanding?!!? please help!
David