
NAME
i.biomass - Computes biomass growth, precursor of crop yield calculation
KEYWORDS
imagery, biomass, fpar, yield
SYNOPSIS
i.biomass
i.biomass help
i.biomass fpar=name lightuseefficiency=name latitude=name dayofyear=name transmissivitysingleway=name wateravailability=name output=name [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- fpar=name
- Name of fPAR raster map
- lightuseefficiency=name
- Name of light use efficiency raster map (UZB:cotton=1.9)
- latitude=name
- Name of degree latitude raster map [dd.ddd]
- dayofyear=name
- Name of Day of Year raster map [1-366]
- transmissivitysingleway=name
- Name of single-way transmissivity raster map [0.0-1.0]
- wateravailability=name
- Value of water availability raster map [0.0-1.0]
- output=name
- Name for output daily biomass growth raster map [kg/ha/d]
DESCRIPTION
i.biomass Calculates the biomass growth for a day after [1][2].
Input:
- fPAR, the modified Photosynthetic Active Radiation for crops.
- Light Use Efficiency [0.0-1.0], in Uzbekistan cotton is at 1.9 most of the time.
- Latitude [0.0-90.0], from i.latlong.
- DOY [1-366].
- Transmissivity of the Atmosphere single-way [0.0-1.0], mostly around 0.7+ in clear sky.
- Water availability [0.0-1.0], possibly using direct output from i.eb.evapfr.
NOTES
It can use the output of i.eb.evapfr directly as water availability input.
TODO
remove Latitude, DOY and Tsw from input and replace with a raster input compatible with r.sun output.
SEE ALSO
i.eb.evapfr
REFERENCES
[1] Bastiaanssen, W.G.M., Ali, S., 2002. A new crop yield forecasting model based on satellite measurements applied across the Indus Basin, Pakistan. Agriculture, Ecosystems and Environment, 94(3):321-340.
[2] Chemin, Y., Platonov, A., Abdullaev, I., Ul-Hassan, M. 2005. Supplementing farm level water productivity assessment by remote sensing in transition economies. Water International. 30(4):513-521.
AUTHORS
Yann Chemin, Bec de Mortagne, France
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