i.tasscap(1grass) | Grass User's Manual | i.tasscap(1grass) |
i.tasscap - Performs Tasseled Cap (Kauth Thomas) transformation.
imagery, transformation, Landsat, MODIS, Tasseled Cap transformation
i.tasscap
i.tasscap --help
i.tasscap input=name[,name,...]
output=basename sensor=string
[--overwrite] [--help] [--verbose] [--quiet]
[--ui]
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:
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 |
i.albedo, i.atcorr, i.landsat.toar, i.vi
Dr. Agustin Lobo, original script, 1997
Markus Neteler, ITC-irst, 2001
Converted to Python by Glynn Clements
Last changed: $Date: 2018-03-02 23:18:09 +0100 (Fri, 02 Mar 2018) $
Available at: i.tasscap source code (history)
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© 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual
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