xenial (1) i.aster.toar.1grass.gz

NAME

       i.aster.toar  - Calculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN.

KEYWORDS

       imagery, radiometric conversion, Terra-ASTER, radiance, reflectance, brightness temperature

SYNOPSIS

       i.aster.toar
       i.aster.toar --help
       i.aster.toar    [-rabcde]    input=name[,name,...]    dayofyear=float   sun_elevation=float   output=name
       [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

   Flags:
       -r
           Output is radiance (W/m2)

       -a
           VNIR is High Gain

       -b
           SWIR is High Gain

       -c
           VNIR is Low Gain 1

       -d
           SWIR is Low Gain 1

       -e
           SWIR is Low Gain 2

       --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]
           Names of ASTER DN layers (15 layers)

       dayofyear=float [required]
           Day of Year of satellite overpass [0-366]

       sun_elevation=float [required]
           Sun elevation angle (degrees, < 90.0)

       output=name [required]
           Base name of the output layers (will add .x)

DESCRIPTION

       i.aster.toar calculates the Top Of Atmosphere (TOA) reflectance for Terra-Aster L1B in the  visible,  NIR
       and  SWIR  bands  (9+1  bands)  and  brigthness  temperature for the TIR bands (5 bands), all from L1B DN
       values.  It is useful after importing your Aster  imagery  from  storage  format  that  is  generally  in
       standard DN values range.

       The order of input bands is

           •   VNIR: 1,2,3N,3B

           •   SWIR: 4,5,6,7,8,9

           •   TIR: 10,11,12,13,14
       in one comma-separated list.

NOTES

       Internally,  a  gain code is defined to modify gains according to spectral bands following the GeoSystems
       GmbH ATCOR Ver. 2.0 Calibration Files.  The function is defined in gain_aster.c file.
       /*Gain Code*/
           /*0 - High (Not Applicable for band 10-14: TIR)*/
           /*1 - Normal*/
           /*2 - Low 1(Not Applicable for band 10-14: TIR)*/
           /*3 - Low 2(Not Applicable for Band 1-3N/B and 10-14)*/

SEE ALSO

        i.landsat.toar, r.in.aster

AUTHORS

       Yann Chemin, CSU, Australia

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

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