i.aster.toar(1grass) | GRASS GIS User's Manual | i.aster.toar(1grass) |
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]
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
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)
Accessed: Sunday Jan 22 07:37:22 2023
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