.TH i.tasscap 1grass "" "GRASS 6.4.4" "Grass User's Manual"
.SH NAME
\fI\fBi.tasscap\fR\fR  - Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data
.SH KEYWORDS
raster, imagery
.SH SYNOPSIS
\fBi.tasscap\fR
.br
\fBi.tasscap help\fR
.br
\fBi.tasscap\fR [\-\fB457\fR] \fBband1\fR=\fIstring\fR \fBband2\fR=\fIstring\fR \fBband3\fR=\fIstring\fR \fBband4\fR=\fIstring\fR \fBband5\fR=\fIstring\fR \fBband7\fR=\fIstring\fR \fBoutprefix\fR=\fIstring\fR  [\-\-\fBoverwrite\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR] 
.SS Flags:
.IP "\fB\-4\fR" 4m
.br
use transformation rules for LANDSAT-4
.IP "\fB\-5\fR" 4m
.br
use transformation rules for LANDSAT-5
.IP "\fB\-7\fR" 4m
.br
use transformation rules for LANDSAT-7
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBband1\fR=\fIstring\fR" 4m
.br
raster input map (LANDSAT channel 1)
.IP "\fBband2\fR=\fIstring\fR" 4m
.br
raster input map (LANDSAT channel 2)
.IP "\fBband3\fR=\fIstring\fR" 4m
.br
raster input map (LANDSAT channel 3)
.IP "\fBband4\fR=\fIstring\fR" 4m
.br
raster input map (LANDSAT channel 4)
.IP "\fBband5\fR=\fIstring\fR" 4m
.br
raster input map (LANDSAT channel 5)
.IP "\fBband7\fR=\fIstring\fR" 4m
.br
raster input map (LANDSAT channel 7)
.IP "\fBoutprefix\fR=\fIstring\fR" 4m
.br
raster output TC maps prefix
.PP
.SH DESCRIPTION
\fIi.tasscap\fR calculates Tasseled Cap (Kauth Thomas, TC) transformation
for LANDSAT-TM data (TM4, TM5, TM7).
The tasseled cap transformation is effectively a compression method to
reduce multiple spectral data into a few bands. The method was originally
developed for understanding important phenomena of crop development in
spectral space (Kauth and Thomas 1976).
.PP
Tasseled cap coefficients for Landsat 7 ETM+ at-satellite reflectance
(C. Huang et al., 2001), the conversion can be achieved with
\fIi.landsat.toar\fR.
.PP
The following TC components are generated:
.RS
.IP
 tasscap.1: corresponds to brightness,
.IP
 tasscap.2: corresponds to greenness,
.IP
 tasscap.3: corresponds to wetness,
.IP
 tasscap.4: corresponds to atmospheric haze.
.RE
.SH EXAMPLE
Calculation of TC maps from North Carolina Landsat scene:
\fC
.DS
.br
g.region rast=lsat7_2002_10 \-p
.br
i.tasscap -7 band1=lsat7_2002_10 band2=lsat7_2002_20 \(rs
.br
             band3=lsat7_2002_30 band4=lsat7_2002_40 \(rs
.br
             band5=lsat7_2002_50 band7=lsat7_2002_70 \(rs
.br
	     outprefix=tasscap
.br
.DE
\fR
Results:
.PP
.br
| 
.br
\fI'Brightness' Tasseled Cap component 1\fR
| 
.br
\fI'Greenness' Tasseled Cap component 2\fR
.br
| 
.br
\fI'Wetness' Tasseled Cap component 3\fR
| 
.br
\fI'Atmospheric haze' Tasseled Cap component 4\fR
.br
.SH REFERENCES
.RS
.IP
LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986,
Proc. IGARSS 1986, p.1467
.IP
Crist, E. P., 1985, A TM tasseled cap equivalent transformation for reflectance
factor data, Remote Sensing of Environment, 17: 301-306.
.IP
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 Gregory Zylstra Raytheon ITSS, 
USGS EROS Data Center Sioux Falls, SD 57198, USA
http://landcover.usgs.gov/pdf/tasseled.pdf
.br
This is published as well in INT. J. OF RS, 2002, VOL 23, NO. 8, 1741-1748.
.br
Compare discussion:
http://adis.cesnet.cz/cgi-bin/lwgate/IMAGRS-L/archives/imagrs-l.log0211/date/article-14.html
.RE
.SH SEE ALSO
\fI
i.landsat.toar
\fR
.SH AUTHOR
Markus Neteler, ITC-irst
.PP
\fILast changed: $Date: 2013-11-07 07:12:33 +0100 (Thu, 07 Nov 2013) $\fR
.PP
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.PP
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