1i.eb.netrad(1) GRASS GIS User's Manual i.eb.netrad(1)
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6 i.eb.netrad - Net radiation approximation (Bastiaanssen, 1995).
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9 imagery, energy balance, net radiation, SEBAL
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12 i.eb.netrad
13 i.eb.netrad --help
14 i.eb.netrad albedo=name ndvi=name temperature=name localutctime=name
15 temperaturedifference2m=name emissivity=name transmissivity_single‐
16 way=name dayofyear=name sunzenithangle=name output=name [--overwrite]
17 [--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 albedo=name [required]
37 Name of albedo raster map [0.0;1.0]
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39 ndvi=name [required]
40 Name of NDVI raster map [-1.0;+1.0]
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42 temperature=name [required]
43 Name of surface temperature raster map [K]
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45 localutctime=name [required]
46 Name of time of satellite overpass raster map [local time in UTC]
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48 temperaturedifference2m=name [required]
49 Name of the difference map of temperature from surface skin to
50 about 2 m height [K]
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52 emissivity=name [required]
53 Name of the emissivity map [-]
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55 transmissivity_singleway=name [required]
56 Name of the single-way atmospheric transmissivitymap [-]
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58 dayofyear=name [required]
59 Name of the Day Of Year (DOY) map [-]
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61 sunzenithangle=name [required]
62 Name of the sun zenith angle map [degrees]
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64 output=name [required]
65 Name of the output net radiation layer
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68 i.eb.netrad calculates the net radiation at the time of satellite over‐
69 pass, the way it is in the SEBAL model of Bastiaanssen (1995). It
70 takes input of Albedo, NDVI, Surface Skin temperature, time of satel‐
71 lite overpass, surface emissivity, difference of temperature from sur‐
72 face skin and about 2 m height (dT), instantaneous satellite overpass
73 single-way atmospheric transmissivity (tsw), Day of Year (DOY), and sun
74 zenith angle.
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77 In the old methods, dT was taken as flat images (dT=5.0), if you don’t
78 have a dT map from ground data, you would want to try something in this
79 line, this is to calculate atmospherical energy balance. In the same
80 way, a standard tsw is used in those equations. Refer to r_net.c for
81 that and for other non-used equations, but stored in there for further
82 research convenience.
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85 Add more explanations.
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88 i.eb.soilheatflux, i.eb.hsebal01, i.albedo
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91 · Bastiaanssen, W.G.M., 1995. Regionalization of surface flux
92 densities and moisture indicators in composite terrain; a
93 remote sensing approach under clear skies in mediterranean cli‐
94 mates. PhD thesis, Wageningen Agricultural Univ., The Nether‐
95 land, 271 pp. (PDF)
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97 · Chemin, Y., 2012. A Distributed Benchmarking Framework for
98 Actual ET Models, in: Irmak, A. (Ed.), Evapotranspiration -
99 Remote Sensing and Modeling. InTech. (PDF)
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102 Yann Chemin, International Rice Research Institute, The Philippines
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105 Available at: i.eb.netrad source code (history)
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107 Main index | Imagery index | Topics index | Keywords index | Graphical
108 index | Full index
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110 © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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114GRASS 7.8.5 i.eb.netrad(1)