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NAME

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

KEYWORDS

imagery, transformation, Landsat, MODIS, Tasseled Cap transformation

SYNOPSIS

i.tasscap
i.tasscap --help
i.tasscap input=name[,name,...] output=basename sensor=string [--overwrite] [--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,...] [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
output=basename [required]
Name for output basename raster map(s)
Name for output basename raster map(s)
sensor=string [required]
Satellite sensor
Options: landsat4_tm, landsat5_tm, landsat7_etm, landsat8_oli, modis
landsat4_tm: Use transformation rules for Landsat 4 TM
landsat5_tm: Use transformation rules for Landsat 5 TM
landsat7_etm: Use transformation rules for Landsat 7 ETM
landsat8_oli: Use transformation rules for Landsat 8 OLI
modis: Use transformation rules for MODIS

Table of contents

DESCRIPTION

i.tasscap calculates Tasseled Cap (Kauth Thomas, TC) transformation for Landsat TM data (TM4, TM5, ETM7) and MODIS data. 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).

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

The following TC components are generated:

EXAMPLE

Calculation of TC maps from North Carolina Landsat 7 ETM scene:
g.region raster=lsat7_2002_10 -p
i.tasscap sensor=landsat7_etm \
  input=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40,lsat7_2002_50,lsat7_2002_70 \
  output=tasscap
Results:

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

REFERENCES

SEE ALSO

i.albedo, i.aster.toar, i.landsat.toar, i.atcorr, i.vi

AUTHOR

Markus Neteler, ITC-irst, based on a script by Agustin Lobo

Last changed: $Date: 2014-12-19 22:55:37 +0100 (Fri, 19 Dec 2014) $


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