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Agri-sensing

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Close Range Data -- June 2, 1998

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The images above were acquired on June 2, 1998, the first day of data collection. The image on the left shows the set-up of the hyperspectral sensor head on the boom. The image on the right shows plant height.

The graph below displays a portion of the first set of hyperspectral corn data, acquired on June 2, 1998. Corn height is approximately 8-10 inches (V5). The instantaneous field of view (IFOV) of the Spectron Engineering SE-590 Spectroradiometer during data collection (using 15° optic) is 60 inches. The sensor was positioned 19 feet above the canopy. Sky conditions were clear. The graph displays the relative reflectance of the target (corn and soil) at various wavelengths across a range of 400 to 1100 manometers. Reflectance is calculated as the ratio of the measured irradiance of the corn (and soil) to the amount of incoming solar irradiance as measured using a white calibration panel.

The curve is nearly straight (indicative of bare soil reflectance) with only a slight slope from the far edge of the visible red range (600-700) to the near-infrared (700-1000). Also, a small "bump" appears in the visible green (500-600 nm).

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