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i.albedo(1grass) | Grass User's Manual | i.albedo(1grass) |
NAME¶
i.albedo - Computes broad band albedo from surface reflectance.KEYWORDS¶
imagery, albedo, reflectance, satellite, Landsat, ASTER, AVHRR, MODISSYNOPSIS¶
i.albedoi.albedo --help
i.albedo [-mnl8acd] input=name[,name,...] output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:¶
- -m
-
MODIS (7 input bands:1,2,3,4,5,6,7) - -n
-
NOAA AVHRR (2 input bands:1,2) - -l
-
Landsat 5+7 (6 input bands:1,2,3,4,5,7) - -8
-
Landsat 8 (7 input bands:1,2,3,4,5,6,7) - -a
-
ASTER (6 input bands:1,3,5,6,8,9) - -c
-
Aggressive mode (Landsat)
Albedo dry run to calculate some water to beach/sand/desert stretching, a kind of simple atmospheric correction - -d
-
Soft mode (MODIS)
Albedo dry run to calculate some water to beach/sand/desert stretching, a kind of simple atmospheric correction - --overwrite
-
Allow output files to overwrite existing files - --help
-
Print usage summary - --verbose
-
Verbose module output - --quiet
-
Quiet module output - --ui
-
Force launching GUI dialog
Parameters:¶
- input=name[,name,...] [required]
-
Name of input raster map - output=name [required]
-
Name for output raster map
DESCRIPTION¶
i.albedo calculates the albedo, that is the Shortwave surface reflectance in the range of 0.3-3 micro-meters. It takes as input individual bands of surface reflectance originating from MODIS, AVHRR, Landsat or Aster satellite sensors and calculates the albedo for those. This is a precursor to r.sun and any energy-balance processing.NOTES¶
It uses for Landsat 8 the weighted average reflectance (temporary until algorithm is found).It assumes MODIS product surface reflectance in [0;10000].
TODO¶
Maybe change input requirement of MODIS to [0.0-1.0]?SEE ALSO¶
r.sun, i.viReferences¶
For a 2 band determination of the Aster BB Albedo see the following: Salleh and Chan, 2014. Land Surface Albedo Determination: Remote Sensing and Statistical Validation. in proceedings of FIG 2014. https://www.fig.net/resources/proceedings/fig_proceedings/fig2014/papers/ts05g/TS05G_salleh_chan_6910.pdfAUTHOR¶
Yann CheminLast changed: $Date: 2015-12-30 18:02:16 +0100 (Wed, 30 Dec 2015) $
SOURCE CODE¶
Available at: i.albedo source code (history)Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index
© 2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual
GRASS 7.2.0 |