Use Tasseled Cap to transform Landsat MSS data, Landsat TM data, or Landsat 7 ETM data. For Landsat MSS data, the tasseled cap transform performs an orthogonal transformation of the original data into a new four-dimensional space consisting of the soil brightness index (SBI), the green vegetation index (GVI), the yellow stuff index (YVI), and a non-such index (NSI) associated with atmospheric effects. For Landsat TM data, the tasseled cap vegetation index consists of three factors: Brightness, Greenness, and Third. The Brightness and Greenness are equivalent to the MSS tasseled cap SBI and GVI indices and the third component is related to soil features, including moisture status. For Landsat 7 ETM data, the tasseled cap transformation produces 6 output bands: Brightness, Greenness, Wetness, Fourth (Haze), Fifth, Sixth. This type of transformation should be applied to calibrated reflectance data rather than applying to raw digital number imagery.
References
Jensen, J. R. Introductory Digital Image Processing. New Jersey: Prentice-Hall, 1986.
Crist, E. and R. Cicone. "Application of the Tasseled Cap Concept to Simulated Thematic Mapper Data,” Photogrammetric Engineering and Remote Sensing 50 (1984): 343-352.
Kauth, R., P. Lambeck, W. Richardson, G. Thomas, and A. Pentland, “Feature Extraction Applied to Agricultural Crops as Seen by Landsat,” Proceedings of the LACIE Symposium, Houston TX, NASA (1979): 705-721.
Huang, C., B. Wylie, L. Yang, C. Homer, and G. Zylstra. “Derivation of a Tasseled Cap Transformation Based on Landsat 7 At-Satellite Reflectance," USGS Staff - Published Research, Paper 621 (2002).
- From the Toolbox, select Transform > Tasseled Cap. The Input File dialog appears.
- Select an input file and perform optional spatial subsetting, then click OK. The Tasseled Cap Transform Parameters dialog appears.
- Specify the Input File Type (Landsat TM, Landsat MSS, or Landsat 7 ETM) from the drop-down list.
- Select output to File or Memory.
- Click OK. ENVI adds the resulting output to the Layer Manager.