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i.tasscapgrass - Online in the Cloud

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This is the command i.tasscapgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


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

KEYWORDS


imagery, transformation, Landsat, MODIS, Tasseled Cap transformation

SYNOPSIS


i.tasscap
i.tasscap --help
i.tasscap input=name[,name,...] output=basename sensor=string [--overwrite] [--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

output=basename [required]
Name for output basename 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
landsat4_tm: Use transformation rules for Landsat 4 TM
landsat5_tm: Use transformation rules for Landsat 5 TM
landsat7_etm: Use transformation rules for Landsat 7 ETM
landsat8_oli: Use transformation rules for Landsat 8 OLI
modis: Use transformation rules for MODIS

DESCRIPTION


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 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 (only selected sensors: Landsat 5,7,8).

EXAMPLE


Calculation of TC maps from North Carolina Landsat 7 ETM scene:
g.region raster=lsat7_2002_10 -p
i.tasscap sensor=landsat7_etm \
input=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40,lsat7_2002_50,lsat7_2002_70 \
output=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 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.

· MODIS Tasselled Cap coefficients - Ref: Lobser & Cohen (2007). MODIS tasselled
cap: land cover characteristics expressed through transformed MODIS data.
International Journal of Remote Sensing, Volume 28(22), Table 3

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