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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Signature Overlap <br /> <br />Oisunct Signatures <br /> <br />o <br />,.-:-.-) <br />-::) <br />to) <br /><.0 <br />N <br /> <br /> <br />'" <br />CIl <br />::J <br />a(ij <br />"0> <br />CCIl <br />CUi:;: <br />aJ", <br />Cii <br />"0 <br /> <br />'" <br />CIl <br />::J <br />aJ(ij <br />"0> <br />CCIl <br />(Q~ <br />m", <br />Cii <br />u <br /> <br />""'nm~Q <br />~,~:(~) ; <br /> <br />I I <br />, I <br />l1a !le, <br /> <br />J-lo2+2.r <br /> <br />...., ------ <br /> <br />. ~ J 1 <br />(a) <br /> <br />(b) <br /> <br />Band C <br />data file values <br /> <br />Band A <br />data file values <br /> <br />Figure 4. Signature ellipses. (a) Spectral overlap; (b) Spectrally distinct. <br /> <br />RasterNector Data Inteln'ation <br /> <br />1) import classified TM image into ARC/INFO <br />2) assign numerical crop codes to each field <br />3) create mask coverages from fields with unknown crop types <br />4) use information from the classified TM image to assign crop codes <br />to fields in the mask coverages <br />5) create final coverages by combining known information (supplied <br />by the State Engineer's office) and classified image data <br />6) convert square meters to acres and compile statistics by quad <br /> <br />Numerical Crop Code Assignments <br /> <br />Draft plots of field boundaries were reviewed by the Colorado State <br />Engineer's Office. A number of individual fields were assigned alpha codes <br />to specify irrigation status, irrigation type, and crop type. Numerical crop <br />codes were required for compatibility with the classified TM image data. <br />AML (ARC Macro Language) programs were developed to automatically <br />assign numerical crop codes based upon the original alpha crop <br />designators. For those fields with no crop information, a procedure was <br />developed to extract crop types from the classified TM image data. <br /> <br />9 <br />