i.eb.evapfr(1grass) GRASS GIS User's Manual i.eb.evapfr(1grass)
NAME
i.eb.evapfr - Computes evaporative fraction and root zone soil mois-
ture.
KEYWORDS
imagery, energy balance, soil moisture, evaporative fraction, SEBAL
SYNOPSIS
i.eb.evapfr
i.eb.evapfr --help
i.eb.evapfr [-m] netradiation=name soilheatflux=name sensibleheat-
flux=name evaporativefraction=name [soilmoisture=name] [--overwrite]
[--help] [--verbose] [--quiet] [--ui]
Flags:
-m
Root zone soil moisture output (Makin, Molden and Bastiaanssen,
2001)
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
netradiation=name [required]
Name of Net Radiation raster map [W/m2]
soilheatflux=name [required]
Name of soil heat flux raster map [W/m2]
sensibleheatflux=name [required]
Name of sensible heat flux raster map [W/m2]
evaporativefraction=name [required]
Name for output evaporative fraction raster map
soilmoisture=name
Name for output root zone soil moisture raster map
DESCRIPTION
i.eb.evapfr calculates the evaporative fraction after Bastiaanssen
1995. The main implementation follows Alexandridis et al. (2009). The
module takes as input the net radiation (see r.sun, i.eb.netrad), soil
heat flux (see i.eb.soilheatflux) and sensible heat flux (see i.eb.hse-
bal01). A flag adds a root zone empirical soil moisture output from the
article of Bastiaanssen, et al. (2000).
SEE ALSO
i.eb.hsebal01, i.eb.netrad, i.eb.soilheatflux, r.sun
REFERENCES
Bastiaanssen, W.G.M., 1995. Estimation of Land surface parameters by
remote sensing under clear-sky conditions. PhD thesis, Wageningen Uni-
versity, Wageningen, The Netherlands. (PDF)
Bastiaanssen, W.G.M., Molden, D.J., Makin, I.W., 2000. Remote sensing
for irrigated agriculture: examples from research and possible applica-
tions. Agricultural water management 46.2: 137-155.
Chemin Y., Alexandridis T.A., 2001. Improving spatial resolution of ET
seasonal for irrigated rice in Zhanghe, China. Asian Journal of Geoin-
formatics. 5(1):3-11.
Alexandridis T.K., Cherif I., Chemin Y., Silleos N.G., Stavrinos E.,
Zalidis G.C., 2009. Integrated methodology for estimating water use in
Mediterranean agricultural areas. Remote Sensing. 1, 445-465. (PDF)
Chemin, Y., 2012. A Distributed Benchmarking Framework for Actual ET
Models, in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and
Modeling. InTech. (PDF)
AUTHOR
Yann Chemin, Asian Institute of Technology, Thailand
SOURCE CODE
Available at: i.eb.evapfr source code (history)
Accessed: unknown
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