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i.biomass(1)		    GRASS GIS User's Manual		  i.biomass(1)

NAME
       i.biomass   - Computes biomass growth, precursor	of crop	yield calcula-
       tion.

KEYWORDS
       imagery,	biomass, FPAR, yield

SYNOPSIS
       i.biomass
       i.biomass --help
       i.biomass   fpar=name   lightuse_efficiency=name	  latitude=name	  day-
       ofyear=name  transmissivity_singleway=name water_availability=name out-
       put=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=nameA [required]
	   Name	of fPAR	raster map

       lightuse_efficiency=nameA [required]
	   Name	of light use efficiency	raster map (UZB:cotton=1.9)

       latitude=nameA [required]
	   Name	of degree latitude raster map [dd.ddd]

       dayofyear=nameA [required]
	   Name	of Day of Year raster map [1-366]

       transmissivity_singleway=nameA [required]
	   Name	of single-way transmissivity raster map	[0.0-1.0]

       water_availability=nameA	[required]
	   Value of water availability raster map [0.0-1.0]

       output=nameA [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	avail-
       ability 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.  Sup-
       plementing farm level water productivity	assessment by  remote  sensing
       in transition economies.	Water International. 30(4):513-521.

AUTHOR
       Yann Chemin, Bec	de Mortagne, France

SOURCE CODE
       Available at: i.biomass source code (history)

       Main  index | Imagery index | Topics index | Keywords index | Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.4 Reference	Manual

GRASS 7.8.4							  i.biomass(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | NOTES | TODO | SEE ALSO | REFERENCES | AUTHOR | SOURCE CODE

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