NAME

       i.albedo  - Computes broad band albedo from surface reflectance.

KEYWORDS

       imagery, albedo, reflectance

SYNOPSIS

       i.albedo
       i.albedo --help
       i.albedo [-mnlacd] 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)

       -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 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

AUTHOR

       Yann Chemin, International Rice Research Institute, The Philippines

       Last changed: $Date: 2014-12-09 18:31:29 +0100 (Tue, 09 Dec 2014) $

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