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Highspatial resolution multispectral imagery was acquired at midseason 1997 by an airborne digital camerasystem and used to establish management zones within a 3ha commercial wine vineyard in Californias Napa Valley. Imageprocessing included offaxis brightness correction, bandtoband alignment, ground registration and conversion to aVegetation Index to enhance sensitivity to canopy density. The image was then stratified by Vegetation Index and colorcodedfor visual discrimination. An output image was generated in TIFFWorld format for input to mapping software on the growerslaptop computer. The imagery was used to delineate low, moderate, and highvigor zones within the study block.Supporting field measurements per zone then included canopy structure (woody biomass, canopy transmittance), vinephysiology (leaf water potential, chlorophyll content), and fruit biochemistry. Grapes from each zone were fermentedseparately and the resulting wines were formally evaluated for difference and quality. The low and highvigor zones wereclearly distinct from one another with respect to most measurements. Block subdivision enabled the production of a reserve(highest) quality wine for the first time ever from this particular block.
Johnson et al. (Mon,) studied this question.