i.tasscap(1grass) GRASS GIS User's Manual i.tasscap(1grass)
NAME
i.tasscap - Performs Tasseled Cap (Kauth Thomas) transformation.
KEYWORDS
imagery, transformation, Landsat, MODIS, Worldview, Sentinel, Tasseled
Cap transformation
SYNOPSIS
i.tasscap
i.tasscap --help
i.tasscap input=name[,name,...] output=basename sensor=string [--over-
write] [--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; for Sentinel-2:
bands 1 to 12, 8A; for Worldview-2: bands 1, 2, 3, 4, 5, 6, 7, 8
output=basename [required]
basename for output 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, sentinel2, worldview2
DESCRIPTION
i.tasscap calculates Tasseled Cap (Kauth Thomas, TC) transformation for
Landsat TM data (TM4, TM5, ETM7), MODIS and Sentinel-2 data. The tas-
seled cap transformation is effectively a compression method to reduce
multiple spectral data into a few bands. The method was originally de-
veloped for understanding important phenomena of crop development in
spectral space (Kauth and Thomas, 1976).
Tasseled cap coefficients for Landsat 7 ETM+ are at-satellite re-
flectance values (C. Huang et al., 2001), the conversion can be
achieved with i.landsat.toar.
The following tasseled cap components are generated:
• tasscap.1: corresponds to brightness,
• tasscap.2: corresponds to greenness,
• tasscap.3: corresponds to wetness,
• tasscap.4: corresponds to atmospheric haze (only selected sen-
sors: Landsat 5,7,8).
EXAMPLE
Calculation of TC maps from North Carolina Landsat 7 ETM scene:
# See manual page of i.landsat.toar for pre-processing
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
• LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986,
Proc. IGARSS 1986, p.1467
• Crist, E. P., 1985, A TM tasseled cap equivalent transformation
for reflectance factor data, Remote Sensing of Environment, 17:
301-306.
• 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 Gre-
gory 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.
• MODIS Tasseled Cap coefficients - Ref: Lobser & Cohen (2007).
MODIS tasseled cap: land cover characteristics expressed
through transformed MODIS data. International Journal of Re-
mote Sensing, Volume 28(22), Table 3
• Sentinel-2 Tasseled Cap coefficients - Ref: Nedkov, R. (2017).
Orthogonal transformation of segmented images from the satel-
lite Sentinel-2. Comptes rendus de l’Académie bulgare des sci-
ences, 70:687-692.
• Yarbrough, L., Navulur, R., 2014, Presentation of the
Kauth-Thomas transform for WorldView-2 reflectance data. Remote
Sensing Letters. 5. DOI: 10.1080/2150704X.2014.885148.
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
Code improvements by Leonardo Perathoner
Sentinel-2 support by Veronica Andreo
Worldview-2 support by Markus Neteler
SOURCE CODE
Available at: i.tasscap source code (history)
Accessed: unknown
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