i.eb.eta
Actual evapotranspiration for diurnal period (Bastiaanssen, 1995).
i.eb.eta netradiationdiurnal=name evaporativefraction=name temperature=name output=name [--overwrite] [--verbose] [--quiet] [--qq] [--ui]
Example:
i.eb.eta netradiationdiurnal=rnetday evaporativefraction=evapfr temperature=tempk output=name
grass.script.run_command("i.eb.eta", netradiationdiurnal="rnetday", evaporativefraction="evapfr", temperature="tempk", output, overwrite=None, verbose=None, quiet=None, superquiet=None)
Example:
gs.run_command("i.eb.eta", netradiationdiurnal="rnetday", evaporativefraction="evapfr", temperature="tempk", output="name")
grass.tools.Tools.i_eb_eta(netradiationdiurnal="rnetday", evaporativefraction="evapfr", temperature="tempk", output, overwrite=None, verbose=None, quiet=None, superquiet=None)
Example:
tools = Tools()
tools.i_eb_eta(netradiationdiurnal="rnetday", evaporativefraction="evapfr", temperature="tempk", output="name")
This grass.tools API is experimental in version 8.5 and expected to be stable in version 8.6.
Parameters
netradiationdiurnal=name [required]
Name of the diurnal net radiation map [W/m2]
Default: rnetday
evaporativefraction=name [required]
Name of the evaporative fraction map [-]
Default: evapfr
temperature=name [required]
Name of the surface skin temperature [K]
Default: tempk
output=name [required]
Name of the output actual evapotranspiration layer [mm/d]
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--qq
Very quiet module output
--ui
Force launching GUI dialog
netradiationdiurnal : str, required
Name of the diurnal net radiation map [W/m2]
Used as: input, raster, name
Default: rnetday
evaporativefraction : str, required
Name of the evaporative fraction map [-]
Used as: input, raster, name
Default: evapfr
temperature : str, required
Name of the surface skin temperature [K]
Used as: input, raster, name
Default: tempk
output : str, required
Name of the output actual evapotranspiration layer [mm/d]
Used as: output, raster, name
overwrite : bool, optional
Allow output files to overwrite existing files
Default: None
verbose : bool, optional
Verbose module output
Default: None
quiet : bool, optional
Quiet module output
Default: None
superquiet : bool, optional
Very quiet module output
Default: None
netradiationdiurnal : str | np.ndarray, required
Name of the diurnal net radiation map [W/m2]
Used as: input, raster, name
Default: rnetday
evaporativefraction : str | np.ndarray, required
Name of the evaporative fraction map [-]
Used as: input, raster, name
Default: evapfr
temperature : str | np.ndarray, required
Name of the surface skin temperature [K]
Used as: input, raster, name
Default: tempk
output : str | type(np.ndarray) | type(np.array) | type(gs.array.array), required
Name of the output actual evapotranspiration layer [mm/d]
Used as: output, raster, name
overwrite : bool, optional
Allow output files to overwrite existing files
Default: None
verbose : bool, optional
Verbose module output
Default: None
quiet : bool, optional
Quiet module output
Default: None
superquiet : bool, optional
Very quiet module output
Default: None
Returns:
result : grass.tools.support.ToolResult | np.ndarray | tuple[np.ndarray] | None
If the tool produces text as standard output, a ToolResult object will be returned. Otherwise, None
will be returned. If an array type (e.g., np.ndarray) is used for one of the raster outputs, the result will be an array and will have the shape corresponding to the computational region. If an array type is used for more than one raster output, the result will be a tuple of arrays.
DESCRIPTION
i.eb.eta calculates the actual evapotranspiration (ETa ; mm/d) for diurnal period after [1], implemented in [3]. It takes input of Diurnal Net Radiation (see r.sun), evaporative fraction (see i.eb.evapfr) and surface skin temperature.
NOTES
Full ETa processing will need those:
- i.vi, i.albedo, r.latlong, i.emissivity
- i.evapo.potrad (GRASS Addon)
- i.eb.netrad, i.eb.soilheatflux, i.eb.hsebal01
- i.eb.evapfr, i.eb.eta
(for time integration: i.evapo.time_integration)
For more details on the algorithms see [1][2][3][4].
REFERENCES
[1] Bastiaanssen, W.G.M., 1995. Estimation of Land surface parameters by remote sensing under clear-sky conditions. PhD thesis, Wageningen University, Wageningen, The Netherlands. (PDF)
[2] Chemin Y., Alexandridis T.A., 2001. Improving spatial resolution of ET seasonal for irrigated rice in Zhanghe, China. Asian Journal of Geoinformatics. 5(1):3-11,2004.
[3] Alexandridis T.K., Cherif I., Chemin Y., Silleos N.G., Stavrinos E., Zalidis G.C. Integrated methodology for estimating water use in Mediterranean agricultural areas. Remote Sensing. 2009, 1, 445-465. (PDF)
[4] Chemin, Y., 2012. A Distributed Benchmarking Framework for Actual ET Models, in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech. (PDF)
SEE ALSO
r.sun, i.eb.evapfr, i.eb.netrad
AUTHOR
Yann Chemin, Asian Institute of Technology, Thailand
SOURCE CODE
Available at: i.eb.eta source code
(history)
Latest change: Thursday Jun 26 21:25:27 2025 in commit 3ec2b13