NAME
i.aster.toar - Calculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN.
KEYWORDS
imagery,
radiometric conversion,
radiance,
reflectance,
brightness temperature,
satellite,
ASTER
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)
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.
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
SOURCE CODE
Available at:
i.aster.toar source code
(history)
Latest change: Wednesday Nov 27 22:53:26 2024 in commit: 3b5486c0463a7103ab2109e28bf860fe34539868
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GRASS Development Team,
GRASS GIS 8.5.0dev Reference Manual