A round baler may include a bale chamber having one or more bale forming apparatus which form a bale in the bale chamber. The round baler may include a size sensor which measures a plurality of dimensions of the bale as the bale increases in size from a partial bale to a completed bale. The round baler may include a force sensor which measures an ending weight of the completed bale. The round baler may include a location determining device which establishes a plurality of locations of the round baler corresponding to the plurality of dimensions of the bale. The round baler can determine a plurality of yields for the bale by correlating changes in the plurality of dimensions of the bale with the ending weight of the completed bale and generating a map by correlating the plurality of yields with the plurality of locations.
