The objective function specification is used as a measure for quality of the calibration. Example 1 is only a simple illustrative example aiming to illustrate how to use the auto-calibration tool. Measurements in this case are not real but an assumed value. AutoCal evaluates objective functions by comparing dfs0 files therefore real observations should normally be used as target files.
AutoCal minimises an aggregation of one or more objective functions. Each objective function may consist of several so-called output measures. For the present example one objective function (‘OF Salinity’) is defined. The function is specified as weighted sum of absolute power and it is given a weight value of 1.
‘Salinity’ is specified as output measure. The measure is specified as the Avg. Error of the difference between the simulated salinity and the measured salinity in the same point within the MIKE 21 domain. By specifying the weight as 1 and the function name as ‘OF Salinity’ the measure will contribute to the objective function called ‘OF Salinity’ with a weight of 1.
No aggregation of objective functions is applied.