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Man Pages
i.aster.toar(1) GRASS GIS User's Manual i.aster.toar(1)

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

imagery, radiometric conversion, radiance, reflectance, brightness temperature, satellite, ASTER

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]

-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

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)

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 to apply after import of original ASTER imagery 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.

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)*/

i.landsat.toar, r.in.aster

ASTER sensor data download: ASTER: Advanced Spaceborne Thermal Emission and Reflection Radiometer

Yann Chemin, CSU, Australia

Available at: i.aster.toar source code (history)

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© 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual

GRASS 7.8.6

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