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i.tasscap(1) GRASS GIS User's Manual i.tasscap(1) 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,...]A [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=basenameA [required] basename for output raster map(s) Name for output basename raster map(s) sensor=stringA [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: o tasscap.1: corresponds to brightness, o tasscap.2: corresponds to greenness, o tasscap.3: corresponds to wetness, o 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: A 'Brightness' Tasseled Cap component 1 A 'Greenness' Tasseled Cap component 2 A 'Wetness' Tasseled Cap component 3 A 'Atmospheric haze' Tasseled Cap component 4 REFERENCES o LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986, Proc. IGARSS 1986, p.1467 o Crist, E. P., 1985, A TM tasseled cap equivalent transformation for reflectance factor data, Remote Sensing of Environment, 17: 301-306. o 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. o 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 o Sentinel-2 Tasseled Cap coefficients - Ref: Nedkov, R. (2017). Orthogonal transformation of segmented images from the satel- lite Sentinel-2. Comptes rendus de l'AcadA(C)mie bulgare des sciences, 70:687-692. o 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) Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index A(C) 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual GRASS 7.8.5 i.tasscap(1)
NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | EXAMPLE | REFERENCES | SEE ALSO | AUTHORS | SOURCE CODE
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