i.albedo.1grass man page

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 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.vi

References

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.pdf

Author

Yann Chemin

Last changed: $Date: 2015-12-30 18:02:16 +0100 (Wed, 30 Dec 2015) $

Source Code

Available at: i.albedo source code (history)

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