The function abtew
computes PET by Abtew method
abtew(tavg, rs, x = NULL)# S4 method for missing,missing
abtew(x)
# S4 method for Raster,Raster
abtew(tavg, rs, x = NULL)
# S4 method for character,character
abtew(tavg, rs, x = NULL)
RasterBrick or data.table of PET values (mm/day)
Raster* object or file path; average temperature (°C)
Raster* object or file path; shortwave radiation (MJ m-2 day-1)
A `data.table` with columns: "lon", "lat", "date", "tavg", "rs"
For Raster inputs, provide raster objects or file paths for `tavg` and `rs`. For `data.table` input, provide a single `data.table` with columns: "lon", "lat", "date", "tavg", and "rs".