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

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

KEYWORDS
       imagery,	radiometric conversion,	radiance, reflectance, brightness tem-
       perature, satellite, ASTER

SYNOPSIS
       i.aster.toar
       i.aster.toar --help
       i.aster.toar [-rabcde] input=name[,name,...] dayofyear=float sun_eleva-
       tion=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,...]A [required]
	   Names of ASTER DN layers (15	layers)

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

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

       output=nameA [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 to	apply after import of original	ASTER  imagery
       that is generally in standard DN	values range.

       The order of input bands	is

	   o   VNIR: 1,2,3N,3B

	   o   SWIR: 4,5,6,7,8,9

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

NOTES
       Internally,  a  gain code is defined to modify gains according to spec-
       tral 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

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

AUTHOR
       Yann Chemin, CSU, Australia

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

       Main index | Imagery index | Topics index | Keywords index |  Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.4 Reference	Manual

GRASS 7.8.4						       i.aster.toar(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | NOTES | SEE ALSO | AUTHOR | SOURCE CODE

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