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i.tasscap(1)		    GRASS GIS User's Manual		  i.tasscap(1)

NAME
       i.tasscap  - Performs Tasseled Cap (Kauth Thomas) transformation.

KEYWORDS
       imagery,	 transformation, Landsat, MODIS, Worldview, Sentinel, Tasseled
       Cap transformation

SYNOPSIS
       i.tasscap
       i.tasscap --help
       i.tasscap input=name[,name,...] output=basename sensor=string  [--over-
       write]  [--help]	 [--verbose]  [--quiet]	 [--ui]

   Flags:
       --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]
	   For	Landsat4-7:  bands 1, 2, 3, 4, 5, 7; for Landsat8: bands 2, 3,
	   4, 5, 6, 7; for MODIS: bands	1, 2, 3, 4, 5, 6, 7;  for  Sentinel-2:
	   bands 1 to 12, 8A; for Worldview-2: bands 1,	2, 3, 4, 5, 6, 7, 8

       output=basenameA	[required]
	   basename for	output raster map(s)
	   Name	for output basename raster map(s)

       sensor=stringA [required]
	   Satellite sensor
	   Options:   landsat4_tm,  landsat5_tm,  landsat7_etm,	 landsat8_oli,
	   modis, sentinel2, worldview2

DESCRIPTION
       i.tasscap calculates Tasseled Cap (Kauth	Thomas,	TC) transformation for
       Landsat	TM data	(TM4, TM5, ETM7), MODIS	and Sentinel-2 data.  The tas-
       seled cap transformation	is effectively a compression method to	reduce
       multiple	 spectral data into a few bands. The method was	originally de-
       veloped for understanding important phenomena of	 crop  development  in
       spectral	space (Kauth and Thomas, 1976).

       Tasseled	 cap  coefficients  for	 Landsat  7  ETM+ are at-satellite re-
       flectance values	(C.  Huang  et	al.,  2001),  the  conversion  can  be
       achieved	with i.landsat.toar.

       The following tasseled cap components are generated:

	   o   tasscap.1: corresponds to brightness,

	   o   tasscap.2: corresponds to greenness,

	   o   tasscap.3: corresponds to wetness,

	   o   tasscap.4:  corresponds to atmospheric haze (only selected sen-
	       sors: Landsat 5,7,8).

EXAMPLE
       Calculation of TC maps from North Carolina Landsat 7 ETM	scene:
       # See manual page of i.landsat.toar for pre-processing
       g.region	raster=lsat7_2002_toar.1 -p
       i.tasscap sensor=landsat7_etm \
	 input=lsat7_2002_toar.1,lsat7_2002_toar.2,lsat7_2002_toar.3,lsat7_2002_toar.4,lsat7_2002_toar.5,lsat7_2002_toar.7 \
	 output=lsat7_2002_tasscap
       Results:

       A  'Brightness' Tasseled	Cap component 1			    A  'Greenness' Tasseled Cap	component 2

       A  'Wetness' Tasseled Cap component 3			    A  'Atmospheric haze' Tasseled Cap component 4

REFERENCES
	   o   LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST	et  al.	 1986,
	       Proc. IGARSS 1986, p.1467

	   o   Crist, E. P., 1985, A TM	tasseled cap equivalent	transformation
	       for reflectance factor data, Remote Sensing of Environment, 17:
	       301-306.

	   o   LANDSAT-7: TASSCAP factors cited	from: DERIVATION OF A TASSELED
	       CAP TRANSFORMATION BASED	ON LANDSAT 7 AT-SATELLITE REFLECTANCE.
	       Chengquan Huang,	Bruce Wylie, Limin Yang, Collin	Homer and Gre-
	       gory Zylstra Raytheon ITSS, USGS	EROS Data Center Sioux	Falls,
	       SD   57198,  USA	 (http://landcover.usgs.gov/pdf/tasseled.pdf).
	       This is published as well in INT. J. OF RS, 2002, VOL  23,  NO.
	       8, 1741-1748.

	   o   MODIS  Tasseled	Cap coefficients - Ref:	Lobser & Cohen (2007).
	       MODIS  tasseled	cap:  land  cover  characteristics   expressed
	       through	transformed  MODIS data.  International	Journal	of Re-
	       mote Sensing, Volume 28(22), Table 3

	   o   Sentinel-2 Tasseled Cap coefficients - Ref: Nedkov, R.  (2017).
	       Orthogonal  transformation  of segmented	images from the	satel-
	       lite Sentinel-2.	 Comptes rendus	de l'AcadA(C)mie  bulgare  des
	       sciences, 70:687-692.

	   o   Yarbrough,   L.,	  Navulur,   R.,  2014,	 Presentation  of  the
	       Kauth-Thomas transform for WorldView-2 reflectance data.	Remote
	       Sensing Letters.	5. DOI:	10.1080/2150704X.2014.885148.

SEE ALSO
	i.albedo, i.atcorr, i.landsat.toar, i.vi

AUTHORS
       Dr. Agustin Lobo, original script, 1997

       Markus Neteler, ITC-irst, 2001

       Converted to Python by Glynn Clements

       Code improvements by Leonardo Perathoner

       Sentinel-2 support by Veronica Andreo

       Worldview-2 support by Markus Neteler

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

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

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.5 Reference	Manual

GRASS 7.8.5							  i.tasscap(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | EXAMPLE | REFERENCES | SEE ALSO | AUTHORS | SOURCE CODE

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