EEMS 10.4 enhanced the feature for velocity rose which allows the user to view the speed and direction distribution at a given cell over a user-defined period of time.
In 2DH View, the user needs to add the velocity layer and turn on the active mode as presented in Figure 1. The user is able to select the location of interest and the information of the selected cell will be presented in a yellow box.
Anchor Figure 1 Figure 1
Figure 1. Add the ship track layer. . The Velocity layer.
RMC on the selected cell and click View Rose Plot ( as shown in Figure 1). Figure 2 presents tab for selecting times to plot and the model time period is also noted in the upper corner. It is possible for the user to define the time period of the rose plot by changing the start time and end time and then click OK to process the plot. Please note that the time format is presented in Julian date.
Anchor Figure 2 Figure 2
Figure 2. Select Times to Plot.
The velocity rose of the select cell is presented in Figure 3.The location of the cell being displayed and the time period are shown at the top of the plot.The velocity roses can be attached to the 2DH view or can be floating as a separated window.
Anchor Figure 3 Figure 3
Figure 3. Velocity Rose of a selected cell.
RMC on the plot of velocity rose and select settings ( shown in Figure 3). The Rose Plot Utility provides options for editing the labels, setting the scale, and adjusting the sectors. The user may also save the defined rose plot format and reload it at a later time, or use it for another cell to apply the same formatting style with the Save and Load options (as Figure 4). In addition, it is also possible to export the rose plot as a bitmap and Window metafile image.
Anchor Figure 4 Figure 4
Figure 4. Settings of the rose plot.
Multiple velocity roses may be displayed by selecting multiple cells in 2DH View shown in Figure 5 . In the main toolbar, the user can check the feature of rose frames, which will show the list of rose plots available with detail information of the location and time period.
Anchor Figure 5 Figure 5
Figure 5. Multiple Velocity Rose Plots.