1i.albedo(1) GRASS GIS User's Manual i.albedo(1)
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6 i.albedo - Computes broad band albedo from surface reflectance.
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9 imagery, albedo, reflectance, satellite, Landsat, ASTER, AVHRR, MODIS
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12 i.albedo
13 i.albedo --help
14 i.albedo [-mnl8acd] input=name[,name,...] output=name [--overwrite]
15 [--help] [--verbose] [--quiet] [--ui]
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17 Flags:
18 -m
19 MODIS (7 input bands:1,2,3,4,5,6,7)
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21 -n
22 NOAA AVHRR (2 input bands:1,2)
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24 -l
25 Landsat 5+7 (6 input bands:1,2,3,4,5,7)
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27 -8
28 Landsat 8 (7 input bands:1,2,3,4,5,6,7)
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30 -a
31 ASTER (6 input bands:1,3,5,6,8,9)
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33 -c
34 Aggressive mode (Landsat)
35 Albedo dry run to calculate some water to beach/sand/desert
36 stretching, a kind of simple atmospheric correction
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38 -d
39 Soft mode (MODIS)
40 Albedo dry run to calculate some water to beach/sand/desert
41 stretching, a kind of simple atmospheric correction
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43 --overwrite
44 Allow output files to overwrite existing files
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46 --help
47 Print usage summary
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49 --verbose
50 Verbose module output
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52 --quiet
53 Quiet module output
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55 --ui
56 Force launching GUI dialog
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58 Parameters:
59 input=name[,name,...]Â [required]
60 Name of input raster map
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62 output=name [required]
63 Name for output raster map
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66 i.albedo calculates the albedo, that is the Shortwave surface re‐
67 flectance in the range of 0.3-3 micro-meters. It takes as input indi‐
68 vidual bands of surface reflectance originating from MODIS, AVHRR,
69 Landsat or Aster satellite sensors and calculates the albedo for those.
70 This is a precursor to r.sun and any energy-balance processing.
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73 It uses for Landsat 8 the weighted average reflectance (temporary solu‐
74 tion until an algorithm is found).
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76 It assumes MODIS product surface reflectance in [0;10000].
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79 The following example creates the raster map "albedo_lsat7_1987" from
80 the LANDSAT-TM5 bands in the North Carolina dataset:
81 g.region raster=lsat5_1987_10 -p
82 i.albedo -l input=lsat5_1987_10,lsat5_1987_20,lsat5_1987_30,lsat5_1987_40,lsat5_1987_50,lsat5_1987_70 output=albedo_lsat7_1987
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84 Figure: Resulting albedo map from LANDSAT 5
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86 The following example creates the raster map "albedo_lsat7_2000" from
87 the LANDSAT-TM7 bands in the North Carolina dataset:
88 g.region raster=lsat7_2000_10 -p
89 i.albedo -l input=lsat7_2000_10,lsat7_2000_20,lsat7_2000_30,lsat7_2000_40,lsat7_2000_50,lsat7_2000_70 output=albedo_lsat7_2000
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91 Figure: Resulting albedo map from LANDSAT 7
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94 Maybe change input requirement of MODIS to [0.0-1.0]?
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97 For a 2 band determination of the Aster BB Albedo see the following:
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99 Salleh and Chan, 2014. Land Surface Albedo Determination: Remote Sens‐
100 ing and Statistical Validation. in proceedings of FIG 2014 (PDF)
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103 r.sun, i.vi
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106 Yann Chemin
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109 Available at: i.albedo source code (history)
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111 Accessed: Saturday Oct 28 18:18:59 2023
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113 Main index | Imagery index | Topics index | Keywords index | Graphical
114 index | Full index
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116 © 2003-2023 GRASS Development Team, GRASS GIS 8.3.1 Reference Manual
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120GRASS 8.3.1 i.albedo(1)