The DITOPS Demo:
Tonnage Graph


Tons of Cargo Delivered Over Time


We have already looked at the capacity utilization of planes and airports. We have also seen the time constraints represented in the move requirement window. All we know until now is that some movements have been scheduled late. Some more detailed information about the schedule quality may be required. The information about the schedule quality can be obtained from several different types of reports. Statistics and schedule summary reports can be created on demand. Graphical descriptions of the solution are also available. Figure tonnage-before-view shows two of these graphical reports: the lateness histogram shows the number of late movements and the amount of lateness; the tonnage graph shows the cummulative delivery of cargo over time. The black line represents the actual delivery date, and the two lighter lines represent the earliest arrival and due dates. The ideal situation would be to have the black line between the two lighter lines. If the black line falls below the second lighter line, this means that cargo is being delivered late. As we can see from the tonnage graph, after day 7, the deliveries start to get late. This graph shows the cummulative cargo delivery over time. The green line represents the earlies arrival date, the red line the due dates, and the black line the scheduled delivery dates. The region where the black line is below the red line represent late movements. The ideal case would be to have all deliveries between the grenn and red lines. As we can see, in the schedule generated, there is an over constrained region from around day 9 to day 15.