The 3D Flow Display controls are used to control 3D displays of flow vectors and trajectories derived from wind and vertical velocity data.

The five types of 3D Flow Displays are 3D Vector Cross Section, 3D Volume Vector, 3D Volume Vector Colored by Speed, 3D Volume Vector Colored by Another Parameter, and 3D Volume Trajectory. The controls for the 3D Vector Cross Section display are similar to those of the Flow Display Controls. The Layer Controls listed below apply for the 3D Volume Vector and 3D Volume Trajectory displays:

Image 1: 3D Volume Vector/Trajectory Controls

• Show - Switches between displaying Vectors and Trajectories. Note that in order to use Trajectories or Curly Vectors, at least four timesteps must be displayed, otherwise, these Show modes will be inactive.
• Vectors - Displays vectors in the Main Display window.
• Size - Changes the length of the vectors. The Size box is an editable box where you can enter a new size and press Enter, or use the slider () to change the value.
• Autosize - Controls the size of the vectors based on zoom level. If the checkbox is checked, the size of the vectors will change proportionally as the zoom level changes. When unchecked, the vectors will remain the same size regardless of zoom level.
• Trajectories - Displays trajectories in the Main Display window.
• Trajectory Form - Allows for selecting the type of trajectory used in the display. The options are Line, Cylinder, Ribbon, and Deform Ribbon.
• Length Offset - Sets the number of timesteps to include in each trajectory.
• Arrow - Adds an arrow head to the trajectories if the Line Trajectory Form is selected.
• Trajectory Start Level - Sets the vertical level where the trajectories will originate from. If 'All Levels' are selected then trajectories will originate from all levels.
• XY Skip - Defines the number of grid points that are skipped to mitigate cluttering in the display in the x/y direction. A skip interval of 0 utilizes all grid points, 1 uses every other grid point, 2 uses every third grid point, etc. This value can be modified by typing a value into the text field and pressing Enter or by using the slider button.
• Z Skip - Defines the number of grid points that are skipped to mitigate cluttering in the display in the z direction. A skip interval of 0 utilizes all grid points, 1 uses every other grid point, 2 uses every third grid point, etc. This value can be modified by typing a value into the text field and pressing Enter or by using the slider button.
• Range - Lists the current range of data for sizing the vectors. Click on the Edit () icon to change the range. This is an option for all of the Flow Displays displays.
• Color - Changes the color of the vectors, streamlines, and trajectories in the display. Note that if the displayed field is derived from speed and direction fields (not u- and v-wind components), or colored by another parameter, the vectors or trajectories will be colored by the speed or the color-by field. In this case, the Color field will be Color Table, where the user can define the enhancement and enhancement range used for the display.
• Line Width - Sets the line width (thickness) in the display. Click on the or put in a value and hit enter to change the value.

Many of the menu items seen utilizing this display are standard options that can be found in the Menus section of the Layer Controls page. However, there are some options that are unique to this display.

The Edit menu has these unique options:

• Color - Sets the color of the vectors or trajectories. This is an option for the 3D Volume Vector and 3D Volume Trajectory display types.
• Color Table - Sets the color enhancement applied to the vectors or trajectories. This is an option for the 3D Volume Vector Colored by Speed and 3D Volume Vector Colored by Another Parameter display types.

The View menu has these unique options:

• Use Data Projection - Re-centers the display and resets the zoom level back to the display's initial settings without changing any other preferences you have modified. This is an option for the Vector Plan View, Streamline Plan View, and Wind Barb Plan View display types.
• Enable Adaptive Resolution (Under Development) - Turns adaptive resolution on or off for the layer. This menu item is only available if adaptive resolution is enabled in the User Preferences. Note that adaptive resolution is still under development.