|VCS Example: Changing the Continental Outlines|
If data plotted on the VCS Canvas has `longitude' and `latitude' as the first and second dimensions, respectively, then continental outlines will be displayed along with the data. This example acquaints the user with procedures for selecting no continental outlines, two internal continental outline maps (i.e., "Fine Continents" and "Coarse Continents"), and three external continental outline maps (i.e., "United States", "Political Borders", and "Rivers").
Note, the continental outlines are changed via the Page Description Panel, not the Continents Editor Panel.
See also Setup Information on the Continents Mapping Options and Hints on the Page Description Panel.
Step 1: Specifying the Template, Graphics Method, and Data
In this example, use `default' template and Isoline graphics method attribute sets in the chosen picture descriptor form on the Page Description Panel. (The template's `default' attribute set is accessed via Main Menu: `Primary' -> `Template Table'. The Isoline `default' set is accessed via Main Menu: `Primary' -> `Graphics Table' -> `Isoline'.)
Select the example.nc file in the Data Selection Panel. Then move the pointer over the `tas' string in this Panel's `Variables' scroll window and double-click the left mouse button. The data attribute name `tas (3D)' will appear in the red Data Panel above.
In order to display the data, select `tas (3D)' with the middle mouse button from the red Data Panel. Then move the pointer to the chosen red input text window in the picture descriptor form and click the middle mouse button. This action will plot the `tas (3D)' data by the Isoline graphics method on the VCS Canvas.
See also the Example on Creating Plots by Different Graphics Methods.
Step 2: Tearing Off the List of Continent Names
Move the pointer over the `Options' pull down menu button located in the Page Description Panel (see above figure). Press and hold down the left mouse button. The menu items `Continents', `Picture', and `Update' will appear. Move the pointer over the `Continents' menu item and continue to hold down the left mouse button. A menu list of continent names (e.g., `None', `Fine', `Coarse', etc.) will appear to the right. Move the pointer to the right over the dashed line located at the top of the list of continent names, and release the left mouse button. The list of menu continent names will remain on the screen.
Step 3: Selecting a Different Continential Outline
Select the `None' menu item in the Continents Tear-Off popup window. The plot on the VCS Canvas will be redrawn with no continential outlines. Next, select the `United States' menu item. The plot will be drawn with the states outlined.
Note: The external continent files (e.g., data_continent_states, data_continent_political, and data_continent_river) must be located in the user's
directory. If VCS cannot find a specified external continents file, then it will use "Fine Continents" as the default.
Now, repeat Step 3, selecting other continent names.
See Setup Information on the Continents Mapping Options for information about adding additional user-defined external continents.