The "Z" icon at the bottom-right hand corner of each window controls the global parameters for that particular window. By clicking on the window with the left mouse button, the "Global Options" menu is activated (see Fig. 3). Not all of these menu items apply to the xsect windows. "Enlarge Window", "Popup Overlay Times", "Popup Movie", and "Movies") apply to both xsect and big. The other items in this menu only apply to big. These options allow you to zoom back out to the global domain ("Scale back to big picture"), change the global domain displayable by big ("Adjust Global Limits"), and activate the Position widget which indicates the coordinates of any pixel in big specified by the left mouse button. By clicking on the "Z" icon with the right mouse button, one can specify the color and font size of the plot annotation. (NOTE: Submenus are indicated by a right-pointing arrow. To activate them, simply highlight the item that is indicated by an arrow, then move the mouse to the right).

Fig. 3: The "Global Options" menu.

The other large icons at the bottom of the main window each represent a directory containing any number of data files. If that directory is currently enabled, the icon will appear blue and yellow, and if the directory is disabled, the icon will appear gray and white. The data file that is displayed from each enabled directory is the most recent one found in the directory before the reference time (shown in the top left corner of the window). IMPORTANT: If the time of this most recent file in the directory is more than 30 minutes before the reference time, the corresponding icon is highlighted in red to alert the user.

In the xsect windows, the icon labeled "TOPO" represents the "topo" directory where the 3D topography data are stored for creating cross-sections, and the icons labeled "cross section" all represent a single directory where radar data are stored (in this case "nex_cam"). In the big window, the "TOPO" icon represents the "elev" directory where 30-second resolution elevation data are stored for horizontal plots. The icon containing an image of a radar dish represents the radar directory ("nex_cam"), and the icon depicting a satellite over the earth represents a group of directories containing satellite data.

By clicking on any of these large icons (in either the xsect or big directory) with the left mouse button, the "Overlay Operations" menu is activated (Fig. 4). The first item on this menu allows you to adjust your contour intervals using the submenu "Adjust Limits" (see Plotting Functions). The submenu allows the user to specify the contour intervals of the current displayed field with "Center/Step" and to adjust highlights with "Highlight/Range".

The other menu items in the "Overlay Operations" menu control the positioning of the icon you selected. The positioning of the enabled icons relative to the others in a particular window will determine where they fall in the overlay stack (except for the "Z" icon, whose position is fixed). The enabled icon that is farthest to the right (left) will be displayed as the top (bottom) overlay. To move a given icon to the top of the overlay stack, select "Raise to top" from the "Overlay Operations" menu. To move the icon to the bottom of the stack, select "Move to bottom." To disable or reenable a directory, select "Disable/reenable". Finally, to remove the icon from the window, select "Remove."

Fig. 4: The Overlay Operations Menu (activated by the left mouse button).

By clicking on any of the large icons with the middle mouse button, another menu is activated (see Fig. 5). The top of this menu displays the available fields contained in the files in that directory (this portion of the menu is specific to each icon). The field that it currently selected is indicated by an asterisk. The middle portion of the menu displays possible color tables that can be used to display the data field (the current color table is indicated by a second asterisk). The bottom portion of the menu specifies the type of contours used (see Plotting Functions).

Fig. 5: A sample menu activated by the middle mouse button.

By clicking on any of the large icons with the right mouse button, a table is activated, called "Data Available" menu (see Fig. 6). At the top and left of the table, the current time mode is indicated (in this case, "Real time mode"). Below this line, the table displays the name of the directory in the left column (in this case "nex_cam") and the most recent data files that are available in that directory in the right column.

Fig. 6: The Data Available Menu (activated by the right mouse button).

The smaller icons in big represent (from left to right in Fig. 1): grid outlines, radar range rings, station markers, map outlines ("MAP"), and the line segment representing the location of the vertical cross-sections ("BOUNDS"). By clicking on the appropriate icon with any of these icons with the middle, or right mouse buttons, specific menus are activated which allow the user to alter the properties of these overlays.

Fig. 7: The "Event Logger" window.

Finally, the "Icon Bar" widget (Fig. 8) is what controls the current Zebra session. Clicking on the "Z" icon activates the "Zeb Control Options" menu, which is subdivided into four sections. The first section allows the user to select a given display setup (in this case, only one is available: "Camano cross-sections"). The second and third sections allow the user to activate one of six widgets that perform specific operations. The two that are of importance to casual Zebra users are the "Position Entry" widget (see above) and the "Time" Widget (see Keeping Track of the Time Mode). By selecting "Shut down Zeb system", which is the last section of the "Zeb Control Options" menu, all Zebra processes are shut down.

Fig. 8: The "Icon Bar" widget.

Fig. 9: The "Zeb Control Options" menu.

The "Print" icon of the "Icon Bar" window allows the user to print a screen dump of a Zebra window. Clicking on the "Help" icon opens a menu containing various help documents. Upon selecting a document, a web browser is opened and the selected document is loaded. The other icons in the "Icon Bar" allow the user to add overlays (icons) to big and the xsect windows. For example, by clicking on one of these icons and selecting an item on the corresponding menu, the user selects a data directory or overlay. Once this data directory or overlay is selected, the user must move the mouse pointer to one of the main windows and then click with any mouse button. This will add the new icon to the top of the overlay stack in that window (i.e. a new icon corresponding to the selected overlay will appear as the rightmost icon in the selected window).