i.tasscap.html 4.0 KB

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  1. <h2>DESCRIPTION</h2>
  2. <em>i.tasscap</em> calculates Tasseled Cap (Kauth Thomas, TC) transformation
  3. for Landsat TM data (TM4, TM5, ETM7), MODIS and Sentinel-2 data.
  4. The tasseled cap transformation is effectively a compression method to
  5. reduce multiple spectral data into a few bands. The method was originally
  6. developed for understanding important phenomena of crop development in
  7. spectral space (Kauth and Thomas, 1976).
  8. <p>
  9. Tasseled cap coefficients for Landsat 7 ETM+ are at-satellite reflectance
  10. values (C. Huang et al., 2001), the conversion can be achieved with
  11. <em>i.landsat.toar</em>.
  12. <p>
  13. The following tasseled cap components are generated:
  14. <ul>
  15. <li> tasscap.1: corresponds to brightness,
  16. <li> tasscap.2: corresponds to greenness,
  17. <li> tasscap.3: corresponds to wetness,
  18. <li> tasscap.4: corresponds to atmospheric haze (only selected sensors: Landsat 5,7,8).
  19. </ul>
  20. <h2>EXAMPLE</h2>
  21. Calculation of TC maps from North Carolina Landsat 7 ETM scene:
  22. <div class="code"><pre>
  23. # See manual page of i.landsat.toar for pre-processing
  24. g.region raster=lsat7_2002_toar.1 -p
  25. i.tasscap sensor=landsat7_etm \
  26. 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 \
  27. output=lsat7_2002_tasscap
  28. </pre></div>
  29. Results:
  30. <p>
  31. <center>
  32. <table border=1>
  33. <tr>
  34. <td align=center>
  35. &nbsp;<img src="i_tasscap_brightness.jpg" alt="'Brightness' Tasseled Cap component 1">
  36. <br>
  37. <font size="-1">
  38. <i>'Brightness' Tasseled Cap component 1</i>
  39. </font>
  40. </td>
  41. <td align=center>
  42. &nbsp;<img src="i_tasscap_greenness.jpg" alt="'Greenness' Tasseled Cap component 2">
  43. <br>
  44. <font size="-1">
  45. <i>'Greenness' Tasseled Cap component 2</i>
  46. </font>
  47. </td>
  48. </tr>
  49. <tr>
  50. <td align=center>
  51. &nbsp;<img src="i_tasscap_wetness.jpg" alt="'Wetness' Tasseled Cap component 3">
  52. <br>
  53. <font size="-1">
  54. <i>'Wetness' Tasseled Cap component 3</i>
  55. </font>
  56. </td>
  57. <td align=center>
  58. &nbsp;<img src="i_tasscap_haze.jpg" alt="'Atmospheric haze' Tasseled Cap component 4">
  59. <br>
  60. <font size="-1">
  61. <i>'Atmospheric haze' Tasseled Cap component 4</i>
  62. </font>
  63. </td>
  64. </tr>
  65. </table>
  66. </center>
  67. <br>
  68. <h2>REFERENCES</h2>
  69. <ul>
  70. <li>LANDSAT-4/LANDSAT-5: TC-factor changed to CRIST et al. 1986,
  71. Proc. IGARSS 1986, p.1467</li>
  72. <li>Crist, E. P., 1985, A TM tasseled cap equivalent transformation for reflectance
  73. factor data, Remote Sensing of Environment, 17: 301-306.</li>
  74. <li>LANDSAT-7: TASSCAP factors cited from:
  75. DERIVATION OF A TASSELED CAP TRANSFORMATION BASED ON LANDSAT 7 AT-SATELLITE REFLECTANCE.
  76. Chengquan Huang, Bruce Wylie, Limin Yang, Collin Homer and Gregory Zylstra Raytheon ITSS,
  77. USGS EROS Data Center Sioux Falls, SD 57198, USA (http://landcover.usgs.gov/pdf/tasseled.pdf).
  78. This is published as well in INT. J. OF RS, 2002, VOL 23, NO. 8, 1741-1748.</li>
  79. <li> MODIS Tasseled Cap coefficients - Ref: Lobser &amp; Cohen (2007). MODIS tasseled cap:
  80. land cover characteristics expressed through transformed MODIS data.
  81. International Journal of Remote Sensing, Volume 28(22), Table 3</li>
  82. <li> Sentinel-2 Tasseled Cap coefficients - Ref: Nedkov, R. (2017). Orthogonal transformation
  83. of segmented images from the satellite Sentinel-2.
  84. Comptes rendus de l'Acad&eacute;mie bulgare des sciences, 70:687-692.</li>
  85. <li>Yarbrough, L., Navulur, R., 2014, Presentation of the Kauth-Thomas transform
  86. for WorldView-2 reflectance data. Remote Sensing Letters. 5. DOI: 10.1080/2150704X.2014.885148.</li>
  87. </ul>
  88. <h2>SEE ALSO</h2>
  89. <em>
  90. <a href="i.albedo.html">i.albedo</a>,
  91. <a href="i.atcorr.html">i.atcorr</a>,
  92. <a href="i.landsat.toar.html">i.landsat.toar</a>,
  93. <a href="i.vi.html">i.vi</a>
  94. </em>
  95. <h2>AUTHORS</h2>
  96. Dr. Agustin Lobo, original script, 1997
  97. <p>
  98. Markus Neteler, ITC-irst, 2001
  99. <p>
  100. Converted to Python by Glynn Clements
  101. <p>
  102. Code improvements by Leonardo Perathoner
  103. <p>
  104. Sentinel-2 support by Veronica Andreo
  105. <p>
  106. Worldview-2 support by Markus Neteler
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