1. A computing device comprising: a memory; one or more processors communicatively coupled to the memory; one or more instructions stored in the memory, executed by the one or more processors, and configured to cause the one or more processors to perform: obtaining a first pixel map for a predicted agronomic yield of a particular field wherein each pixel of the first pixel map represents an agronomic yield of a crop at a physical location within the particular field; obtaining a second pixel map for a measured agronomic yield of the particular field wherein each pixel of the second pixel map represents an agronomic yield of a crop at a physical location within the particular field; generating, from the first pixel map, a first vector of values; generating, from the second pixel map, a second vector of values; generating a matrix of metric coefficients wherein each row of the matrix of metric coefficients corresponds to a first pixel location of the first pixel map, each column of the matrix of metric coefficients corresponds to a second pixel location of the first pixel map, and each value in the matrix of metric coefficients is computed using a spatial distance between the first pixel location and the second pixel location for the value; computing a particular difference metric that specifies a difference between the first pixel map and the second pixel map based on the first vector of values, the second vector of values, and the matrix of metric coefficients; computing, from the particular difference metric, a particular normalized difference metric comprising a quotient of the difference metric with a sum of the metric coefficients in the matrix of metric coefficients; generating and sending, to a field manager computing device, one or more field management recommendations based, at least in part, on the particular normalized difference metric.