i.tasscap.1grass man page

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

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 tasseled cap components are generated:

Example

Calculation of TC maps from North Carolina Landsat 7 ETM scene:

# See manual page of i.landsat.toar for preprocessing
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:

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

References

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

Last changed: $Date: 2016-12-28 21:57:16 +0100 (Wed, 28 Dec 2016) $

Source Code

Available at: i.tasscap source code (history)

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