A combine harvester , comprising: a threshing system for threshing and separating crop material; a cleaning system for separating grain from chaff, the cleaning system being positioned to collect crop material falling from the threshing system ; a plurality of threshing system sensors for detecting an amount of material passing from the threshing system to the cleaning system , at least two of the threshing system sensors being spaced apart along a longitudinal axis of the combine harvester ; a plurality of cleaning system sensors for detecting an amount of material passing through the cleaning system , at least two of the cleaning system sensors being spaced apart along the longitudinal axis of the combine harvester ; one or more computing devices configured to - receive data from the threshing system sensors and from the cleaning system sensors , and use the data to generate a graphical user interface including - in a first portion of the user interface , a graphical representation of an amount of material passing through the threshing system at multiple positions along a longitudinal direction of the combine harvester , and a graphical representation of an amount of material passing through the cleaning system at multiple positions along the longitudinal direction of the combine harvester , characterized in that at least two of the threshing system sensors are spaced apart along a lateral axis of the combine harvester ; at least two of the cleaning system sensors are spaced apart along the lateral axis of the combine harvester ; and in a second portion of the user interface , the one or more computing devices is configured to generate a graphical representation of an amount of material passing through the threshing system at a plurality of locations along a lateral axis of the combine harvester , and a graphical representation of an amount of material passing through the cleaning system at a plurality of locations along the lateral axis of the combine harvester . a threshing system for threshing and separating crop material; a cleaning system for separating grain from chaff, the cleaning system being positioned to collect crop material falling from the threshing system ; a plurality of threshing system sensors for detecting an amount of material passing from the threshing system to the cleaning system , at least two of the threshing system sensors being spaced apart along a longitudinal axis of the combine harvester ; a plurality of cleaning system sensors for detecting an amount of material passing through the cleaning system , at least two of the cleaning system sensors being spaced apart along the longitudinal axis of the combine harvester ; one or more computing devices configured to - receive data from the threshing system sensors and from the cleaning system sensors , and use the data to generate a graphical user interface including - in a first portion of the user interface , a graphical representation of an amount of material passing through the threshing system at multiple positions along a longitudinal direction of the combine harvester , and a graphical representation of an amount of material passing through the cleaning system at multiple positions along the longitudinal direction of the combine harvester , at least two of the threshing system sensors are spaced apart along a lateral axis of the combine harvester ; at least two of the cleaning system sensors are spaced apart along the lateral axis of the combine harvester ; and in a second portion of the user interface , the one or more computing devices is configured to generate a graphical representation of an amount of material passing through the threshing system at a plurality of locations along a lateral axis of the combine harvester , and a graphical representation of an amount of material passing through the cleaning system at a plurality of locations along the lateral axis of the combine harvester . <EOS>