i.biomass.1grass - Man Page
Computes biomass growth, precursor of crop yield calculation.
Keywords
imagery, biomass, FPAR, yield
Synopsis
i.biomass
i.biomass --help
i.biomass fpar=name lightuse_efficiency=name latitude=name dayofyear=name transmissivity_singleway=name water_availability=name output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags
- --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
- fpar=name [required]
Name of fPAR raster map
- lightuse_efficiency=name [required]
Name of light use efficiency raster map (UZB:cotton=1.9)
- latitude=name [required]
Name of degree latitude raster map [dd.ddd]
- dayofyear=name [required]
Name of Day of Year raster map [1-366]
- transmissivity_singleway=name [required]
Name of single-way transmissivity raster map [0.0-1.0]
- water_availability=name [required]
Value of water availability raster map [0.0-1.0]
- output=name [required]
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 r.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
i.biomass 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.
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. (PDF)
[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.
See Also
i.eb.evapfr, r.latlong, r.sun
Author
Yann Chemin, Bec de Mortagne, France
Source Code
Available at: i.biomass source code (history)
Accessed: Tuesday Mar 19 11:02:28 2024
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