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Response and Positioning Accuracy of a Variable-Rate Aerial Application System and Use of Enhanced Imagery for Creation of Prescription Maps
Y. Huang, S. J. Thomson
USDA ARS
Experiments were conducted to evaluate a variable rate aerial application system in the field, and experiences with iterative system improvement are outlined. Spray cards placed in the field determined application accuracy, and system response to step changes in flow by logging flowmeter data vs. time was evaluated.  Experiments indicated that placement accuracy using 5 Hz global positioning and hydraulically operated flow control system was within 5 meters for the majority of runs, and that system response to changing rates could be improved in the field by instant observation of simplified flow output files allowing in-field adjustment of control algorithms. Experiences with a turn-key solution for GPS-triggered remote sensing, interfacing requirements for near-real time variable rate aerial application, and experiences with sensor fusion to detect the onset of crop stress thereby increasing the value of imagery are outlined.  An example procedure for rapid conversion of imagery in GIS output format to the Hemisphere Mapstar® prescription format is illustrated.
Keyword: remote sensing, precision agriculture, site specific application, variable rate application
Y. Huang    S. J. Thomson    Precision Aerial Application    Poster    2012
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