i.eb.soilheatflux(1grass) | GRASS GIS User's Manual | i.eb.soilheatflux(1grass) |
i.eb.soilheatflux - Soil heat flux approximation (Bastiaanssen, 1995).
imagery, energy balance, soil heat flux, SEBAL
i.eb.soilheatflux
i.eb.soilheatflux --help
i.eb.soilheatflux [-r] albedo=name
ndvi=name temperature=name
netradiation=name localutctime=name
output=name [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
i.eb.soilheatflux calculates the soil heat flux approximation (g0) after Bastiaanssen (1995). The main reference for implementation is Alexandridis, 2009. It takes input of Albedo, NDVI, Surface Skin temperature, Net Radiation (see r.sun), time of satellite overpass, and a flag for the Roerink empirical modification from the HAPEX-Sahel experiment. The "time of satellite overpass" map can be obtained as follows:
# 1) extract the overpass time in GMT from metadata file i.landsat.toar -p input=dummy output=dummy2 \
metfile=LC81250452013338LGN00_MTL.txt lsatmet=time # ... in this example approx. 03:12am GMT # 2) create map for computational region of Landsat scene g.region rast=LC81250452013338LGN00_B4 -p r.mapcalc "overpasstime = 3.211328"
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)
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.
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)
Chemin, Y., 2012. A Distributed Benchmarking Framework for Actual ET Models, in: Irmak, A. (Ed.), Evapotranspiration - Remote Sensing and Modeling. InTech. (PDF)
r.sun, i.albedo, i.emissivity, i.eb.hsebal01, i.eb.evapfr i.landsat.toar
Yann Chemin, Asian Institute of Technology, Thailand
Available at: i.eb.soilheatflux source code (history)
Accessed: Sunday Jan 22 07:37:25 2023
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