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- W1994217089 abstract "A custom Windows-based program called SPAT was written in MatLab (1999) to theoretically investigate theoverall quality of spread patterns. It computes overlapped patterns, spread pattern characteristics, and produces cv-swathwidth and rate-swath width graphs. Pattern shapes that are often seen in practice such as Triangles, Trapezoids, M- andCrown shapes were analyzed. The effect of skewness, a pattern distorting factor in aerial as well as ground-basedapplication, was studied as well. Traditionally, the quality of a spread pattern is defined in terms of the measuredapplication rate (% deviation from the target rate) and the uniformity (expressed as the statistical coefficient of variation,cv). Both factors are not constants, but are functions of the swath width which makes their practical value disputable. Inthis study a new descriptor called robustness was defined. Robustness is a value based on the average cv-values over arange of potential swath-widths. A robust pattern allows the applicator to change the swath width (and the applicationrate), and be confident that no damage to the crop will occur. The most robust pattern found was a Gaussian shape, alsoknown as a bell curve. The second most promising pattern found was a symmetric triangle with the target rate value inthe center. Trapezoids were found to be acceptable and even more efficient than triangles, although too much emphasis onlarge swath widths can make the pattern non-robust. Skewness was found to be a major factor in producing non-robustpatterns; it tends to increase the cv over the whole range of useful swath widths. Although SPAT was written for analysisof aerial spread patterns, the overall results of this study can be applied to ground based application." @default.
- W1994217089 created "2016-06-24" @default.
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- W1994217089 date "2000-01-01" @default.
- W1994217089 modified "2023-09-27" @default.
- W1994217089 title "SPREAD PATTERN ANALYSIS TOOL (SPAT): I. DEVELOPMENT AND THEORETICAL EXAMPLES" @default.
- W1994217089 cites W2112035628 @default.
- W1994217089 doi "https://doi.org/10.13031/2013.3031" @default.
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