1i.biomass(1)                  Grass User's Manual                 i.biomass(1)
2
3
4

NAME

6       i.biomass   - Computes biomass growth, precursor of crop yield calcula‐
7       tion.
8

KEYWORDS

10       imagery, biomass, FPAR, yield
11

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]
18
19   Flags:
20       --overwrite
21           Allow output files to overwrite existing files
22
23       --help
24           Print usage summary
25
26       --verbose
27           Verbose module output
28
29       --quiet
30           Quiet module output
31
32       --ui
33           Force launching GUI dialog
34
35   Parameters:
36       fpar=name [required]
37           Name of fPAR raster map
38
39       lightuse_efficiency=name [required]
40           Name of light use efficiency raster map (UZB:cotton=1.9)
41
42       latitude=name [required]
43           Name of degree latitude raster map [dd.ddd]
44
45       dayofyear=name [required]
46           Name of Day of Year raster map [1-366]
47
48       transmissivity_singleway=name [required]
49           Name of single-way transmissivity raster map [0.0-1.0]
50
51       water_availability=name [required]
52           Value of water availability raster map [0.0-1.0]
53
54       output=name [required]
55           Name for output daily biomass growth raster map [kg/ha/d]
56

DESCRIPTION

58       i.biomass calculates the biomass growth for a day after [1][2].  Input:
59
60           ·   fPAR, the modified Photosynthetic Active Radiation for crops.
61
62           ·   Light Use Efficiency [0.0-1.0], in Uzbekistan cotton is at  1.9
63               most of the time.
64
65           ·   Latitude [0.0-90.0], from r.latlong.
66
67           ·   DOY [1-366].
68
69           ·   Transmissivity  of  the atmosphere single-way [0.0-1.0], mostly
70               around 0.7+ in clear sky.
71
72           ·   Water availability [0.0-1.0], possibly using direct output from
73               i.eb.evapfr.
74

NOTES

76       i.biomass  can  use  the output of i.eb.evapfr directly as water avail‐
77       ability input.
78

TODO

80       Remove Latitude, DOY and Tsw from input and replace with a raster input
81       compatible with r.sun output.
82

SEE ALSO

84        i.eb.evapfr, r.latlong, r.sun
85

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)
90
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.
94

AUTHOR

96       Yann Chemin, Bec de Mortagne, France
97
98       Last changed: $Date: 2016-05-18 09:07:29 +0200 (Wed, 18 May 2016) $
99

SOURCE CODE

101       Available at: i.biomass source code (history)
102
103       Main  index | Imagery index | Topics index | Keywords index | Graphical
104       index | Full index
105
106       © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
107
108
109
110GRASS 7.4.4                                                       i.biomass(1)
Impressum