An evaluator can determine whether there is a material change in the observed parameter of a crop or field with respect to average measurements of the observed parameter. A location-determining receiver is adapted to determine a location of a vehicle corresponding to the material change in the observed parameter. An imaging device is adapted to collect the image data for a time interval associated with the material change. A data processor is arranged for associating the image data with the corresponding location data and storing the image data and corresponding location data in a data storage device.
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