A computer implemented method of controlling a mobile work machine, comprising: obtaining a map (211, 212, 213) of a worksite that divides the worksite into control zones; identifying a current control zone in which the mobile work machine is operating; detecting a current location of the mobile work machine in the current control zone; determining a set of observed crop condition values from a sensor on the work machine sensing crop processed by the machine, each indicative of an observed value of a variable characterizing a crop condition in a geographic portion of the current control zone on which the mobile work machine has already performed an operation; obtaining a set of estimated crop condition values from a first data source having a first data accuracy indicated by a first quality metric, each indicative of an estimated value of the variable characterizing the crop condition in a portion of the current control zone on which the mobile work machine has yet to perform the operation; generating a near real time display, in a display window, of at least a portion of the current control zone showing an estimated value zone portion with visual indicia indicative of the set of estimated crop condition values, an observed value zone portion with visual indicia indicative of the set of observed crop condition values and a current location indicator indicating the current location of the mobile work machine in the current control zone; generating an alternate data source display element (312, 314, 328, 348) identifying an alternate data source and an alternate data source quality metric display element (316, 318, 330, 350) indicative of an accuracy of the alternate data from the alternate data source; characterized by detecting a data source switch trigger indicating that an operator wishes to switch the data source to select the alternate data source for which the near real time display is generated and upon which the machine is controlled, and once the data source switching process has been triggered, verified and authenticated or authorized, performing a data source switch; and controlling a work machine actuator based on the set of estimated condition values from the selected data source and the current location of the mobile work machine. obtaining a map (211, 212, 213) of a worksite that divides the worksite into control zones; identifying a current control zone in which the mobile work machine is operating; detecting a current location of the mobile work machine in the current control zone; determining a set of observed crop condition values from a sensor on the work machine sensing crop processed by the machine, each indicative of an observed value of a variable characterizing a crop condition in a geographic portion of the current control zone on which the mobile work machine has already performed an operation; obtaining a set of estimated crop condition values from a first data source having a first data accuracy indicated by a first quality metric, each indicative of an estimated value of the variable characterizing the crop condition in a portion of the current control zone on which the mobile work machine has yet to perform the operation; generating a near real time display, in a display window, of at least a portion of the current control zone showing an estimated value zone portion with visual indicia indicative of the set of estimated crop condition values, an observed value zone portion with visual indicia indicative of the set of observed crop condition values and a current location indicator indicating the current location of the mobile work machine in the current control zone; generating an alternate data source display element (312, 314, 328, 348) identifying an alternate data source and an alternate data source quality metric display element (316, 318, 330, 350) indicative of an accuracy of the alternate data from the alternate data source; characterized by detecting a data source switch trigger indicating that an operator wishes to switch the data source to select the alternate data source for which the near real time display is generated and upon which the machine is controlled, and once the data source switching process has been triggered, verified and authenticated or authorized, performing a data source switch; and controlling a work machine actuator based on the set of estimated condition values from the selected data source and the current location of the mobile work machine.