i.biomass(1grass)

1i.biomass(1)                  Grass User's Manual                 i.biomass(1)
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NAME

6       i.biomass   - Computes biomass growth, precursor of crop yield calcula‐
7       tion.
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KEYWORDS

10       imagery, biomass, FPAR, yield
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SYNOPSIS

13       i.biomass
14       i.biomass --help
15       i.biomass   fpar=name   lightuse_efficiency=name   latitude=name   day‐
16       ofyear=name  transmissivity_singleway=name water_availability=name out‐
17       put=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]
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19   Flags:
20       --overwrite
21           Allow output files to overwrite existing files
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23       --help
24           Print usage summary
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26       --verbose
27           Verbose module output
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29       --quiet
30           Quiet module output
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32       --ui
33           Force launching GUI dialog
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35   Parameters:
36       fpar=name [required]
37           Name of fPAR raster map
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39       lightuse_efficiency=name [required]
40           Name of light use efficiency raster map (UZB:cotton=1.9)
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42       latitude=name [required]
43           Name of degree latitude raster map [dd.ddd]
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45       dayofyear=name [required]
46           Name of Day of Year raster map [1-366]
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48       transmissivity_singleway=name [required]
49           Name of single-way transmissivity raster map [0.0-1.0]
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51       water_availability=name [required]
52           Value of water availability raster map [0.0-1.0]
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54       output=name [required]
55           Name for output daily biomass growth raster map [kg/ha/d]
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DESCRIPTION

58       i.biomass calculates the biomass growth for a day after [1][2].  Input:
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60           ·   fPAR, the modified Photosynthetic Active Radiation for crops.
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62           ·   Light Use Efficiency [0.0-1.0], in Uzbekistan cotton is at  1.9
63               most of the time.
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65           ·   Latitude [0.0-90.0], from r.latlong.
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67           ·   DOY [1-366].
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69           ·   Transmissivity  of  the atmosphere single-way [0.0-1.0], mostly
70               around 0.7+ in clear sky.
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72           ·   Water availability [0.0-1.0], possibly using direct output from
73               i.eb.evapfr.
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NOTES

76       i.biomass  can  use  the output of i.eb.evapfr directly as water avail‐
77       ability input.
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TODO

80       Remove Latitude, DOY and Tsw from input and replace with a raster input
81       compatible with r.sun output.
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REFERENCES

87       [1]  Bastiaanssen,  W.G.M., Ali, S., 2002. A new crop yield forecasting
88       model based on satellite measurements applied across the  Indus  Basin,
89       Pakistan. Agriculture, Ecosystems and Environment, 94(3):321-340. (PDF)
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91       [2]  Chemin, Y., Platonov, A., Abdullaev, I., Ul-Hassan, M. 2005.  Sup‐
92       plementing farm level water productivity assessment by  remote  sensing
93       in transition economies. Water International. 30(4):513-521.
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AUTHOR

96       Yann Chemin, Bec de Mortagne, France
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98       Last changed: $Date: 2016-05-18 09:07:29 +0200 (Wed, 18 May 2016) $
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SOURCE CODE

101       Available at: i.biomass source code (history)
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103       Main  index | Imagery index | Topics index | Keywords index | Graphical
104       index | Full index
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106       © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
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110GRASS 7.4.4                                                       i.biomass(1)