i.biomass (1)
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 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:
o fPAR, the modified Photosynthetic Active Radiation for crops.
o Light Use Efficiency [0.0-1.0], in Uzbekistan cotton is at 1.9 most of the time.
o Latitude [0.0-90.0], from r.latlong.
o DOY [1-366].
o Transmissivity of the atmosphere single-way [0.0-1.0], mostly around 0.7+ in clear sky.
o 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.
SEE ALSO
i.eb.evapfr, r.latlong, r.sun
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.
AUTHOR
Yann Chemin, Bec de Mortagne, France
Last changed: $Date: 2016-05-18 09:07:29 +0200 (Wed, 18 May 2016) $
SOURCE CODE
Available at: i.biomass source code (history)
Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index
2003-2017 GRASS Development Team, GRASS GIS 7.2.1 Reference Manual