i.albedo(1grass) GRASS GIS User's Manual i.albedo(1grass)
NAME
i.albedo - Computes broad band albedo from surface reflectance.
KEYWORDS
imagery, albedo, reflectance, satellite, Landsat, ASTER, AVHRR, MODIS
SYNOPSIS
i.albedo
i.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 re-
flectance in the range of 0.3-3 micro-meters. It takes as input indi-
vidual 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 solu-
tion until an algorithm is found).
It assumes MODIS product surface reflectance in [0;10000].
EXAMPLE
The following example creates the raster map "albedo_lsat7_1987" from
the LANDSAT-TM5 bands in the North Carolina dataset:
g.region raster=lsat5_1987_10 -p
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
Figure: Resulting albedo map from LANDSAT 5
The following example creates the raster map "albedo_lsat7_2000" from
the LANDSAT-TM7 bands in the North Carolina dataset:
g.region raster=lsat7_2000_10 -p
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
Figure: Resulting albedo map from LANDSAT 7
TODO
Maybe change input requirement of MODIS to [0.0-1.0]?
SEE ALSO
r.sun, i.vi
References
For a 2 band determination of the Aster BB Albedo see the following:
Salleh and Chan, 2014. Land Surface Albedo Determination: Remote Sens-
ing and Statistical Validation. in proceedings of FIG 2014 (PDF)
AUTHOR
Yann Chemin
SOURCE CODE
Available at: i.albedo source code (history)
Accessed: unknown
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GRASS 7.8.7 i.albedo(1grass)
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