GRASS GIS manual: i.tasscap

NAME

i.tasscap - Performs Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data.

KEYWORDS

imagery, transformation

SYNOPSIS

i.tasscap
i.tasscap help
i.tasscap [-457] band1=name band2=name band3=name band4=name band5=name band7=name output_prefix=string [--verbose] [--quiet]

Flags:

-4: Use transformation rules for LANDSAT-4
-5: Use transformation rules for LANDSAT-5
-7: Use transformation rules for LANDSAT-7
--verbose: Verbose module output
--quiet: Quiet module output

Parameters:

band1=name [required]: Name of input raster map (LANDSAT channel 1)
band2=name [required]: Name of input raster map (LANDSAT channel 2)
band3=name [required]: Name of input raster map (LANDSAT channel 3)
band4=name [required]: Name of input raster map (LANDSAT channel 4)
band5=name [required]: Name of input raster map (LANDSAT channel 5)
band7=name [required]: Name of input raster map (LANDSAT channel 7)
output_prefix=string [required]: Prefix for output raster maps

DESCRIPTION

i.tasscap calculates Tasseled Cap (Kauth Thomas, TC) transformation for LANDSAT-TM data (TM4, TM5, TM7). The following TC components are generated:

tasscap.1: corresponds to brightness,
tasscap.2: corresponds to greenness,
tasscap.3: corresponds to wetness,
tasscap.4: corresponds to atmospheric haze.

EXAMPLE

Calculation of TC maps from North Carolina Landsat scene:

g.region rast=lsat7_2002_10 -p
i.tasscap -7 band1=lsat7_2002_10 band2=lsat7_2002_20 \
             band3=lsat7_2002_30 band4=lsat7_2002_40 \
             band5=lsat7_2002_50 band7=lsat7_2002_70 \
	     outprefix=tasscap

Results:

'Brightness' Tasseled Cap component 1	'Greenness' Tasseled Cap component 2
'Wetness' Tasseled Cap component 3	'Atmospheric haze' Tasseled Cap component 4

REFERENCES

LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986, Proc. IGARSS 1986, p.1467
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
This is published as well in INT. J. OF RS, 2002, VOL 23, NO. 8, 1741-1748.
Compare discussion: http://adis.cesnet.cz/cgi-bin/lwgate/IMAGRS-L/archives/imagrs-l.log0211/date/article-14.html

AUTHOR

Markus Neteler, ITC-irst

Last changed: $Date: 2011-11-08 13:24:20 -0800 (Tue, 08 Nov 2011) $

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