1i.evapo.mh(1) Grass User's Manual i.evapo.mh(1)
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6 i.evapo.mh - Computes evapotranspiration calculation modified or orig‐
7 inal Hargreaves formulation, 2001.
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10 imagery, evapotranspiration
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13 i.evapo.mh
14 i.evapo.mh --help
15 i.evapo.mh [-zhs] netradiation_diurnal=name average_temperature=name
16 minimum_temperature=name maximum_temperature=name [precipitation=name]
17 output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
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19 Flags:
20 -z
21 Set negative ETa to zero
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23 -h
24 Use original Hargreaves (1985)
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26 -s
27 Use Hargreaves-Samani (1985)
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29 --overwrite
30 Allow output files to overwrite existing files
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32 --help
33 Print usage summary
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35 --verbose
36 Verbose module output
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38 --quiet
39 Quiet module output
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41 --ui
42 Force launching GUI dialog
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44 Parameters:
45 netradiation_diurnal=name [required]
46 Name of input diurnal net radiation raster map [W/m2/d]
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48 average_temperature=name [required]
49 Name of input average air temperature raster map [C]
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51 minimum_temperature=name [required]
52 Name of input minimum air temperature raster map [C]
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54 maximum_temperature=name [required]
55 Name of input maximum air temperature raster map [C]
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57 precipitation=name
58 Name of precipitation raster map [mm/month]
59 Disabled for original Hargreaves (1985)
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61 output=name [required]
62 Name for output raster map [mm/d]
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65 i.evapo.mh calculates the reference evapotranspiration (ET) after Harg‐
66 reaves et al. (1985), Hargreaves and Samani (1985) and the Modified
67 Hargreaves version found in Droogers and Allen (2002).
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70 i.evapo.pt, i.evapo.pm, i.evapo.time, r.sun
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73 · Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural ben‐
74 efits for Senegal River Basin. Journal of Irrigation and
75 Drainange Engineering, ASCE, 111(2):113-124.
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77 · Droogers P, Allen RG, 2002. Towards a simplified global refer‐
78 ence evapotranspiration equation. Irrigation Science.
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80 · Droogers, P., Allen RG. 2002. Estimating reference evapotran‐
81 spiration under inaccurate data conditions. Irrigation and
82 Drainage Systems 16: 33-45.
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84 · Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspira‐
85 tion from ambient air temperature. American Society of Agricul‐
86 tural Engineers (Microfiche collection)(USA). no. fiche no.
87 85-2517.
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90 Yann Chemin, GRASS Development team, 2007-2016
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93 Available at: i.evapo.mh source code (history)
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95 Main index | Imagery index | Topics index | Keywords index | Graphical
96 index | Full index
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98 © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual
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102GRASS 7.8.2 i.evapo.mh(1)