NAME

       i.tasscap  - Tasseled Cap (Kauth Thomas) transformation for LANDSAT-TM data

KEYWORDS

       raster, imagery

SYNOPSIS

       i.tasscap
       i.tasscap help
       i.tasscap   [-457]   band1=string   band2=string  band3=string  band4=string  band5=string
       band7=string outprefix=string  [--overwrite]  [--verbose]  [--quiet]

   Flags:
       -4
           use transformation rules for LANDSAT-4

       -5
           use transformation rules for LANDSAT-5

       -7
           use transformation rules for LANDSAT-7

       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       band1=string
           raster input map (LANDSAT channel 1)

       band2=string
           raster input map (LANDSAT channel 2)

       band3=string
           raster input map (LANDSAT channel 3)

       band4=string
           raster input map (LANDSAT channel 4)

       band5=string
           raster input map (LANDSAT channel 5)

       band7=string
           raster input map (LANDSAT channel 7)

       outprefix=string
           raster output TC maps prefix

DESCRIPTION

       i.tasscap calculates Tasseled Cap (Kauth Thomas, TC) transformation  for  LANDSAT-TM  data
       (TM4, TM5, TM7).  The following TC components are generated:

                      tasscap.1: corresponds to brightness,

                      tasscap.2: corresponds to greenness,

                      tasscap.3: corresponds to wetness,

                      tasscap.4: corresponds to atmospheric haze.

EXAMPLE

       Calculation of TC maps from North Carolina Landsat scene:
       g.region rast=lsat7_2002_10 -p
       i.tasscap -7 band1=lsat7_2002_10 band2=lsat7_2002_20 \
                    band3=lsat7_2002_30 band4=lsat7_2002_40 \
                    band5=lsat7_2002_50 band7=lsat7_2002_70 \
                 outprefix=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

                     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  Gregory  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.
                     Compare       discussion:       http://adis.cesnet.cz/cgi-bin/lwgate/IMAGRS-
                     L/archives/imagrs-l.log0211/date/article-14.html

AUTHOR

       Markus Neteler, ITC-irst

       Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

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