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
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.
It uses for Landsat 8 the weighted average reflectance (temporary solution
until an algorithm is found).
It assumes MODIS product surface reflectance in [0;10000].
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
Maybe change input requirement of MODIS to [0.0-1.0]?
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
(PDF)
r.sun,
i.vi
Yann Chemin
SOURCE CODE
Available at:
i.albedo source code
(history)
Latest change: Thursday Feb 03 11:10:06 2022 in commit: 547ff44e6aecfb4c9cbf6a4717fc14e521bec0be
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GRASS Development Team,
GRASS GIS 8.2.2dev Reference Manual