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The mapping results suggest that for the midsummer Landsat data used, there was not a sufficiently reliable relationship between Landsat-derived spectral clusters and sunflowers to allow 'automated' production of useful sunflower location maps. The occurrence of sunflower pixels in all cluster classes was a consequence of the diversity in sunflower appearance at the point in the growing season when the Landsat image used for digital processing was acquired. -Authors
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Midseason mapping of sunflowers using Landsat digital data.