User Manual - pancroma

Tasseled Cap TransformationThe Tasseled Cap Transformation is the conversion of the readings in a set ofchannels into composite values; i.e., the weighted sums of separate channelreadings. One of these weighted sums measures roughly the brightness of eachpixel in the scene. One of these other composite values represents the degree ofgreenness of the pixels and another represents the degree of yellowness ofvegetation and is commonly interpreted as the wetness of the soil. Usually thereare just three composite variables. The Tasseled Cap Transformation waspresented in 1976 by R.J. Kauth and G.S. Thomas of the EnvironmentalResearch Institute of Michigan in an article entitled "The Tasseled Cap -- AGraphic Description of the Spectral-Temporal Development of Agricultural Cropsas Seen by LANDSAT." This paper was published in the Proceedings of theSymposium on Machine Processing of Remotely Sensed Data.The Tasseled Cap transformation is commonly used for enhancing the spectralinformation content of Landsat ETM+ data. The Tasseled Cap indices arecalculated from DN or reflectance data from six ETM+ bands, band 1, band 2,band 3, band 4 (NIR) band 5 and band 7. The six input bands are transformedinto three output bands:199