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Preliminary Development of a Methodology to Relate Sprayer Control Time with Weed Distribution Patterns to Improve the Design of Patch Spraying Equipment

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  031157,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13979) @2003
Authors:   Carroll, John Paul, Holden, Nicholas Mark
Keywords:   Weed maps, distance transform analysis, spatial pattern, variable rate spraying

A method is presented for processing a weed map to derive a cumulative area distribution curve, which can be used to derive a quantification of the spatial pattern of weeds in a field. This is achieved using a distance transform image analysis technique, which calculates the distance of every non-weed pixel in the field from the nearest weed pixel or vice versa. An exponential function was fitted to the cumulative area distribution curve describing the distance-transformed image histogram and the equation parameters used to group fields with similar weed distribution patterns. In conjunction with a sprayer control function this will permit the sprayer selection based on both sprayer performance and the type of field where the sprayer will operate give the least error patch spraying. Alternatively the method can be used to specify sprayer design criteria. It was found that an exponential association equation summarized weed spatial pattern satisfactorily for the 50 weed maps analyzed and that its parameters were useful in grouping fields by nature of the weed distribution.

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