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NAME

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

KEYWORDS

raster, imagery

SYNOPSIS

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

Flags:

-4
use transformation rules for LANDSAT-4
-5
use transformation rules for LANDSAT-5
-7
use transformation rules for LANDSAT-7
--overwrite
Allow output files to overwrite existing files
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

band1=string
raster input map (LANDSAT channel 1)
band2=string
raster input map (LANDSAT channel 2)
band3=string
raster input map (LANDSAT channel 3)
band4=string
raster input map (LANDSAT channel 4)
band5=string
raster input map (LANDSAT channel 5)
band7=string
raster input map (LANDSAT channel 7)
outprefix=string
raster output TC maps prefix

DESCRIPTION

i.tasscap 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).

Tasseled cap coefficients for Landsat 7 ETM+ at-satellite reflectance (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 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
'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.landsat.toar

AUTHOR

Markus Neteler, ITC-irst

Last changed: $Date: 2013-11-06 22:12:33 -0800 (Wed, 06 Nov 2013) $


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