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The Time shift option is introduced to change the start time of the aggregated series, by default the time shift is 0. The time shift can be changed by using the spin button or by entering a value in the text box. The time shift values must be integer values, between -1000 and +1000.
This option can be useful when aggregating hourly rainfall values to daily values. When you aggregate hourly values from 1-1-2000 8:00 to 2-1-2000 8:00 the aggregated daily rainfall value will, by default, be set to 1-1-2000. In many countries the meteorological service uses a different procedure, the aggregated daily rainfall value is set to 2-1-2000. In HYMOS you can change the time shift to 1 when you want to follow this procedure.
The standard aggregation method in HYMOS looks back in time. While aggregating day values, the values of the past 24 hours are used. Other programs, like FEWS, perform their aggregation based on the next 24 hours. By selecting a time-shift of one with the unity of the timestep of the aggregated series in the aggragation window, the aggregation method in HYMOS can be changed. HYMOS will be looking at the next 24 hours while performing day aggregations.
To execute aggregation following entries/selections have to be made:
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