i.aster.toar(1grass)

Usage

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]

Keywords

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

Overview

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 brightness 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.

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)*/

Source code

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

Accessed: Monday Feb 24 17:51:31 2025

Releases

5 releases since Debian 9 (Stretch); the text changed 4 times.

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