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- <h2>DESCRIPTION</h2>
- <em>i.tasscap</em> calculates Tasseled Cap (Kauth Thomas, TC) transformation
- for Landsat TM data (TM4, TM5, ETM7), MODIS and Sentinel-2 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).
- <p>
- Tasseled cap coefficients for Landsat 7 ETM+ are at-satellite reflectance
- values (C. Huang et al., 2001), the conversion can be achieved with
- <em>i.landsat.toar</em>.
- <p>
- The following tasseled cap components are generated:
- <ul>
- <li> tasscap.1: corresponds to brightness,
- <li> tasscap.2: corresponds to greenness,
- <li> tasscap.3: corresponds to wetness,
- <li> tasscap.4: corresponds to atmospheric haze (only selected sensors: Landsat 5,7,8).
- </ul>
- <h2>EXAMPLE</h2>
- Calculation of TC maps from North Carolina Landsat 7 ETM scene:
- <div class="code"><pre>
- # 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
- </pre></div>
- Results:
- <p>
- <center>
- <table border=1>
- <tr>
- <td align=center>
- <img src="i_tasscap_brightness.jpg" alt="'Brightness' Tasseled Cap component 1">
- <br>
- <font size="-1">
- <i>'Brightness' Tasseled Cap component 1</i>
- </font>
- </td>
- <td align=center>
- <img src="i_tasscap_greenness.jpg" alt="'Greenness' Tasseled Cap component 2">
- <br>
- <font size="-1">
- <i>'Greenness' Tasseled Cap component 2</i>
- </font>
- </td>
- </tr>
- <tr>
- <td align=center>
- <img src="i_tasscap_wetness.jpg" alt="'Wetness' Tasseled Cap component 3">
- <br>
- <font size="-1">
- <i>'Wetness' Tasseled Cap component 3</i>
- </font>
- </td>
- <td align=center>
- <img src="i_tasscap_haze.jpg" alt="'Atmospheric haze' Tasseled Cap component 4">
- <br>
- <font size="-1">
- <i>'Atmospheric haze' Tasseled Cap component 4</i>
- </font>
- </td>
- </tr>
- </table>
- </center>
- <br>
- <h2>REFERENCES</h2>
- <ul>
- <li>LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986,
- Proc. IGARSS 1986, p.1467</li>
- <li>Crist, E. P., 1985, A TM tasseled cap equivalent transformation for reflectance
- factor data, Remote Sensing of Environment, 17: 301-306.</li>
- <li>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.</li>
- <li> MODIS Tasseled Cap coefficients - Ref: Lobser & Cohen (2007). MODIS tasseled cap:
- land cover characteristics expressed through transformed MODIS data.
- International Journal of Remote Sensing, Volume 28(22), Table 3</li>
- <li> Sentinel-2 Tasseled Cap coefficients - Ref: Nedkov, R. (2017). Orthogonal transformation
- of segmented images from the satellite Sentinel-2.
- Comptes rendus de l'Académie bulgare des sciences, 70:687-692.</li>
- <li>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.</li>
- </ul>
- <h2>SEE ALSO</h2>
- <em>
- <a href="i.albedo.html">i.albedo</a>,
- <a href="i.atcorr.html">i.atcorr</a>,
- <a href="i.landsat.toar.html">i.landsat.toar</a>,
- <a href="i.vi.html">i.vi</a>
- </em>
- <h2>AUTHORS</h2>
- Dr. Agustin Lobo, original script, 1997
- <p>
- Markus Neteler, ITC-irst, 2001
- <p>
- Converted to Python by Glynn Clements
- <p>
- Code improvements by Leonardo Perathoner
- <p>
- Sentinel-2 support by Veronica Andreo
- <p>
- Worldview-2 support by Markus Neteler
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