i.tasscap(1grass)

1i.tasscap(1)                  Grass 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, Tasseled Cap transformation
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SYNOPSIS

12       i.tasscap
13       i.tasscap --help
14       i.tasscap input=name[,name,...] output=basename sensor=string  [--over‐
15       write]  [--help]  [--verbose]  [--quiet]  [--ui]
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17   Flags:
18       --overwrite
19           Allow output files to overwrite existing files
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21       --help
22           Print usage summary
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24       --verbose
25           Verbose module output
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27       --quiet
28           Quiet module output
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30       --ui
31           Force launching GUI dialog
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33   Parameters:
34       input=name[,name,...] [required]
35           For Landsat4-7: bands 1, 2, 3, 4, 5, 7; for Landsat8: bands  2,  3,
36           4, 5, 6, 7; for MODIS: bands 1, 2, 3, 4, 5, 6, 7
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38       output=basename [required]
39           Name for output basename raster map(s)
40           Name for output basename raster map(s)
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42       sensor=string [required]
43           Satellite sensor
44           Options:   landsat4_tm,  landsat5_tm,  landsat7_etm,  landsat8_oli,
45           modis
46           landsat4_tm: Use transformation rules for Landsat 4 TM
47           landsat5_tm: Use transformation rules for Landsat 5 TM
48           landsat7_etm: Use transformation rules for Landsat 7 ETM
49           landsat8_oli: Use transformation rules for Landsat 8 OLI
50           modis: Use transformation rules for MODIS
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DESCRIPTION

53       i.tasscap calculates Tasseled Cap (Kauth Thomas, TC) transformation for
54       Landsat  TM  data  (TM4,  TM5,  ETM7) and MODIS data.  The tasseled cap
55       transformation is effectively a compression method to  reduce  multiple
56       spectral data into a few bands. The method was originally developed for
57       understanding important phenomena of crop development in spectral space
58       (Kauth and Thomas, 1976).
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60       Tasseled   cap   coefficients  for  Landsat  7  ETM+  are  at-satellite
61       reflectance values (C. Huang et  al.,  2001),  the  conversion  can  be
62       achieved with i.landsat.toar.
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64       The following tasseled cap components are generated:
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66           ·   tasscap.1: corresponds to brightness,
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68           ·   tasscap.2: corresponds to greenness,
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70           ·   tasscap.3: corresponds to wetness,
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72           ·   tasscap.4:  corresponds to atmospheric haze (only selected sen‐
73               sors: Landsat 5,7,8).
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EXAMPLE

76       Calculation of TC maps from North Carolina Landsat 7 ETM scene:
77       # See manual page of i.landsat.toar for preprocessing
78       g.region raster=lsat7_2002_toar.1 -p
79       i.tasscap sensor=landsat7_etm \
80         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 \
81         output=lsat7_2002_tasscap
82       Results:
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84       ’Brightness’ Tasseled Cap component 1                        ’Greenness’ Tasseled Cap component 2
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86       ’Wetness’ Tasseled Cap component 3                           ’Atmospheric haze’ Tasseled Cap component 4
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REFERENCES

90           ·   LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST  et  al.  1986,
91               Proc. IGARSS 1986, p.1467
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93           ·   Crist, E. P., 1985, A TM tasseled cap equivalent transformation
94               for reflectance factor data, Remote Sensing of Environment, 17:
95               301-306.
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97           ·   LANDSAT-7: TASSCAP factors cited from: DERIVATION OF A TASSELED
98               CAP TRANSFORMATION BASED ON LANDSAT 7 AT-SATELLITE REFLECTANCE.
99               Chengquan Huang, Bruce Wylie, Limin Yang, Collin Homer and Gre‐
100               gory Zylstra Raytheon ITSS, USGS EROS Data Center Sioux  Falls,
101               SD 57198, USA http://landcover.usgs.gov/pdf/tasseled.pdf
102               This  is  published as well in INT. J. OF RS, 2002, VOL 23, NO.
103               8, 1741-1748.
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105           ·   MODIS Tasselled Cap coefficients - Ref: Lobser & Cohen  (2007).
106               MODIS  tasselled  cap:  land  cover  characteristics  expressed
107               through  transformed  MODIS  data.   International  Journal  of
108               Remote Sensing, Volume 28(22), Table 3
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AUTHORS

114       Dr. Agustin Lobo, original script, 1997
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116       Markus Neteler, ITC-irst, 2001
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118       Converted to Python by Glynn Clements
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120       Last changed: $Date: 2018-03-02 23:18:09 +0100 (Fri, 02 Mar 2018) $
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SOURCE CODE

123       Available at: i.tasscap source code (history)
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125       Main  index | Imagery index | Topics index | Keywords index | Graphical
126       index | Full index
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128       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual
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132GRASS 7.6.0                                                       i.tasscap(1)