1i.tasscap(1)                GRASS GIS User's Manual               i.tasscap(1)
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NAME

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

9       imagery,  transformation, Landsat, MODIS, Worldview, Sentinel, Tasseled
10       Cap transformation
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SYNOPSIS

13       i.tasscap
14       i.tasscap --help
15       i.tasscap input=name[,name,...] output=basename sensor=string  [--over‐
16       write]  [--help]  [--verbose]  [--quiet]  [--ui]
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18   Flags:
19       --overwrite
20           Allow output files to overwrite existing files
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22       --help
23           Print usage summary
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25       --verbose
26           Verbose module output
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28       --quiet
29           Quiet module output
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31       --ui
32           Force launching GUI dialog
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34   Parameters:
35       input=name[,name,...] [required]
36           For  Landsat4-7:  bands 1, 2, 3, 4, 5, 7; for Landsat8: bands 2, 3,
37           4, 5, 6, 7; for MODIS: bands 1, 2, 3, 4, 5, 6, 7;  for  Sentinel-2:
38           bands 1 to 12, 8A; for Worldview-2: bands 1, 2, 3, 4, 5, 6, 7, 8
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40       output=basename [required]
41           basename for output raster map(s)
42           Name for output basename raster map(s)
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44       sensor=string [required]
45           Satellite sensor
46           Options:   landsat4_tm,  landsat5_tm,  landsat7_etm,  landsat8_oli,
47           modis, sentinel2, worldview2
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DESCRIPTION

50       i.tasscap calculates Tasseled Cap (Kauth Thomas, TC) transformation for
51       Landsat  TM data (TM4, TM5, ETM7), MODIS and Sentinel-2 data.  The tas‐
52       seled cap transformation is effectively a compression method to  reduce
53       multiple  spectral data into a few bands. The method was originally de‐
54       veloped for understanding important phenomena of  crop  development  in
55       spectral space (Kauth and Thomas, 1976).
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57       Tasseled  cap  coefficients  for  Landsat  7  ETM+ are at-satellite re‐
58       flectance values (C.  Huang  et  al.,  2001),  the  conversion  can  be
59       achieved with i.landsat.toar.
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61       The following tasseled cap components are generated:
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63           •   tasscap.1: corresponds to brightness,
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65           •   tasscap.2: corresponds to greenness,
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67           •   tasscap.3: corresponds to wetness,
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69           •   tasscap.4:  corresponds to atmospheric haze (only selected sen‐
70               sors: Landsat 5,7,8).
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EXAMPLE

73       Calculation of TC maps from North Carolina Landsat 7 ETM scene:
74       # See manual page of i.landsat.toar for pre-processing
75       g.region raster=lsat7_2002_toar.1 -p
76       i.tasscap sensor=landsat7_etm \
77         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 \
78         output=lsat7_2002_tasscap
79       Results:
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81         ’Brightness’ Tasseled Cap component 1                       ’Greenness’ Tasseled Cap component 2
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83         ’Wetness’ Tasseled Cap component 3                          ’Atmospheric haze’ Tasseled Cap component 4
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85

REFERENCES

87           •   LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST  et  al.  1986,
88               Proc. IGARSS 1986, p.1467
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90           •   Crist, E. P., 1985, A TM tasseled cap equivalent transformation
91               for reflectance factor data, Remote Sensing of Environment, 17:
92               301-306.
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94           •   LANDSAT-7: TASSCAP factors cited from: DERIVATION OF A TASSELED
95               CAP TRANSFORMATION BASED ON LANDSAT 7 AT-SATELLITE REFLECTANCE.
96               Chengquan Huang, Bruce Wylie, Limin Yang, Collin Homer and Gre‐
97               gory Zylstra Raytheon ITSS, USGS EROS Data Center Sioux  Falls,
98               SD   57198,  USA  (http://landcover.usgs.gov/pdf/tasseled.pdf).
99               This is published as well in INT. J. OF RS, 2002, VOL  23,  NO.
100               8, 1741-1748.
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102           •   MODIS  Tasseled  Cap coefficients - Ref: Lobser & Cohen (2007).
103               MODIS  tasseled  cap:  land  cover  characteristics   expressed
104               through  transformed  MODIS data.  International Journal of Re‐
105               mote Sensing, Volume 28(22), Table 3
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107           •   Sentinel-2 Tasseled Cap coefficients - Ref: Nedkov, R.  (2017).
108               Orthogonal  transformation  of segmented images from the satel‐
109               lite Sentinel-2.  Comptes rendus  de  l’Académie  bulgare  des
110               sciences, 70:687-692.
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112           •   Yarbrough,   L.,   Navulur,   R.,  2014,  Presentation  of  the
113               Kauth-Thomas transform for WorldView-2 reflectance data. Remote
114               Sensing Letters. 5. DOI: 10.1080/2150704X.2014.885148.
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SEE ALSO

117        i.albedo, i.atcorr, i.landsat.toar, i.vi
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AUTHORS

120       Dr. Agustin Lobo, original script, 1997
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122       Markus Neteler, ITC-irst, 2001
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124       Converted to Python by Glynn Clements
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126       Code improvements by Leonardo Perathoner
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128       Sentinel-2 support by Veronica Andreo
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130       Worldview-2 support by Markus Neteler
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SOURCE CODE

133       Available at: i.tasscap source code (history)
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135       Accessed: Mon Jun 20 16:47:44 2022
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137       Main  index | Imagery index | Topics index | Keywords index | Graphical
138       index | Full index
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140       © 2003-2022 GRASS Development Team, GRASS GIS 8.2.0 Reference Manual
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144GRASS 8.2.0                                                       i.tasscap(1)
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