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<br />on3053 <br /> <br />The Tasseled Cap transform has been rigorously tested and used <br />extensively in agricultural research. In 1984, Crist and Cicone applied this <br />transform to simulated TM data and found that the features produced were <br />directly correlated to the physical characteristics of agricultural fields. <br />Through this linear relationship between the tasseled cap features and the <br />actual field conditions, the results can be readily interpreted. <br /> <br />As applied to TM data, the Tasseled Cap transform disseminates six <br />bands of TM data (TM 1,2,3,4,5, and 7) into three-dimensional space. The <br />three orthogonal axes define two perpendicular planes and a transition <br />zone between them (Figure 3). Crist and Cicone (1984) identified the two <br />perpendicular planes as a soil brightness index and a greenness ilidex. The <br />brightness index is highly correlated with bare soil. The greenness index is <br />highly correlated with LAI Oeafarea index), canopy closure, and/or <br />biomass. The .third band, defined by the transitlolizoIie, is related to soil <br />ancLleafmoisturecontentand'is lllost inf1ue~cedby the mid-infrared; TM <br />bands 5 and 7 (Iluete, 1984). The position of a pixel within this.three- <br />dimensional data space can be readily related to ground' conditions. <br /> <br />PLANE OF VEGETATION <br /> <br /> <br />. , <br />" <br />" <br />" <br />" TRANsmON ZONE <br />, <br />, <br />" <br />" <br />". <br />" <br />,. <br /> <br /> <br />Figure 3. Dispersion of6-band TM data based on Tasseled Cap transform. <br /> <br />7 <br />